 Patent Application Title |
Patent App Num. |
Date |
| Adaptive time diversity and spatial diversity for ofdm | 20130142031 | 20130606 |
 An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.
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| Method for transmitting and receiving wireless signal in wireless communication system and apparatus for the same | 20130136157 | 20130530 |
 A method for receiving a data frame by a receive station in a wireless local area network (WLAN) system is provided. The method includes: receiving a signal A field including a multiple input multiple output (MIMO) indicator and including a first signal A sub-field and a second signal A sub-field each transmitted as different orthogonal frequency division multiplexing (OFDM) symbols; determining a processing type of a subsequently transmitted signal based on the signal A field; receiving a data field; and obtaining data by interpreting the data field based on the processing type of the signal. Different modulation schemes are applied to a higher frequency region and a lower frequency region on a subcarrier of the first signal A sub-field.
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| Group resource allocation techniques for ieee 802.16m | 20130121234 | 20130516 |
 Group resource allocation techniques for IEEE 802.16m are generally presented. In this regard a method is introduced comprising generating a plurality of bitmaps to identify resource allocations and multiple input multiple output (MIMO) modes for a group of broadband wireless mobile stations, wherein each mobile station in the group is assigned a position within a user bitmap to identify whether the mobile station is allocated frame resources and wherein the position within one or more MIMO bitmap(s) to identify a MIMO mode, and transmitting the bitmaps in a group resource allocation (GRA) information element (IE) of a broadband wireless media access protocol (MAP) frame portion. Other embodiments are also disclosed and claimed.
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| Method for transmitting channel quality information in a multiple input multiple output system | 20130121247 | 20130516 |
 A method is provided for transmitting channel quality information (CQI) in a MIMO system. A method for allowing a receiver to feed back a CQI value to a transmitter in a Multiple Input Multiple Output (MIMO) system includes receiving a transmission (Tx) pilot signal for each Tx antenna from a base station (BS), measuring a first CQI value of a first codeword and a second CQI value of a second codeword on the basis of the pilot signal, and transmitting the first CQI value of the first codeword and the second CQI value of the second codeword to the base station (BS), wherein at least one of the first and second CQI values includes specific information capable of indicating a transmission restriction status of a corresponding... |
| Transmission of channel state information | 20130121312 | 20130516 |
 Signalling information relating to Multiple Input Multiple Output MIMO channel state information characteristics that a user equipment UE determines to be highest priority for a downlink is transmitted uplink from a the UE to a node of a cellular wireless network. The UE receives an indicator from the node indicating a preferred basis of the highest priority signalling information. The UE compiles the highest priority signalling information according to the preferred basis, and sends the compiled signalling information to the node. If the UE determines that the number of MIMO layers preferred for use for the downlink is one, then signalling information is sent in different messages indicating a first and second codeword respectively, the first codeword being selected to be a closest codeword to an... |
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| Methods and systems for scheduling in a virtual mimo communication environment | 20130114444 | 20130509 |
| A system and method for scheduling cooperative uplink transmissions in a virtual multiple input multiple output (MIMO) wireless communication environment are provided. More specifically, both random and channel aware orthogonal scheduling techniques for identifying a sub-set of N mobile terminals to provide cooperative uplink transmissions for each transmit time interval are provided.
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| Control channel transmitting method, base station and terminal | 20130107839 | 20130502 |
| A terminal that includes a control channel demodulating part configured to have a control channel format notified from a base station which transmits a control channel with the use of the control channel format, selected from among a plurality of control channel formats, each including modulation scheme information, having different number of types of control parameters according to whether Multiple Input Multiple Output (MIMO) transmission is applied or not, and demodulate the control channel received from the base station; and a data channel demodulating part configured to demodulate a data channel received from the base station with the use of a result of the demodulation of the control channel carried out by the control channel demodulating part, and when the number of bits indicating a modulation... |
| Reference signal transmission method for downlink multiple input multiple output system | 20130101004 | 20130425 |
| A reference signal transmission method in a downlink MIMO system is disclosed. The downlink MIMO system supports a first UE supporting N transmission antennas among a total of M transmission antennas (where M>N) and a second UE supporting the M transmission antennas. The method includes transmitting, by a base station (BS), subframe-associated information which designates a first subframe in which data for the first UE and the second UE is transmitted and a second subframe in which data only for the second UE can be transmitted within a radio frame having a plurality of subframes, and transmitting the first subframe and the second subframe. Reference signals corresponding to antenna ports ‘0’ to ‘N−1’ of the N antennas are mapped to the first subframe, and reference signals... |
| Systems and methods for downlink scheduling in multiple input multiple output wireless communications systems | 20130101008 | 20130425 |
| Systems and methods for downlink scheduling in wireless communications systems are described. In some embodiments, a method includes: applying channel prediction at a transmitter for transmitting information to one or more mobile devices; predicting channel state information for a channel over which the information is transmitted, the channel state information being based, at least, on the channel prediction; determining a precoding matrix to apply to the information, the determining the precoding matrix being based, at least, on predicted channel state information; and scheduling transmission of the information to the one or more mobile devices based, at least, on an asymptotic ergodic rate for the one or more mobile devices. The asymptotic ergodic rate can be based on large-scale channel behavior and a maximum Doppler shift between... |
| Mimo wireless communication greenfield preamble formats | 20130089054 | 20130411 |
| A method for multiple input multiple output wireless communication begins by determining protocols of wireless communication devices within a proximal region. The method continues by determining whether the protocols of the wireless communication devices within the proximal region are of a like protocol. The method continues by determining the number of transmit antennas. The method continues, when the protocols of the wireless communication devices within the proximal region are of the like protocol, formatting a preamble of a frame of the wireless communication utilizing at least one of cyclic shifting of symbols, cyclic shifting of tones, sparse tone allocation, and sparse symbol allocation based on the number of transmit antennas.
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| Wireless radio access network control channel capacity management | 20130077597 | 20130328 |
| Transmission capacity for a control channel sent to multiple mobile wireless devices in a wireless network is increased by transmitting the control channel using multi user multiple input multiple output transmissions (MU MIMO). Received signal quality measured at mobile wireless devices in a radio sector are communicated to a radio node and used to determine one or more sets of mobile wireless devices to share transmission of control channel elements on the same time and frequency resource element. The radio node indicates the use of MU MIMO and the selection of precoding matrices to each of the mobile wireless devices in the each set of mobile wireless devices.
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| Point-to-multipoint microwave communication | 20130077612 | 20130328 |
| A microwave communication system may include subscriber stations in communication with a base station. The stations may include time duplex circuitry normally found in wireless local area networks (WLANs). Signals normally routed through antennas associated with such circuitry instead are routed through circuitry to perforin frequency conversion to and from microwave communications frequencies, for communications over microwave links between the subscriber stations and the base station. In some embodiments the wireless circuitry is configured for multiple input multiple output (MIMO) operation with one antenna port dedicated for transmission of data and one antenna port dedicated to reception of data.
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| Method and apparatus for operating a power save mode in a wireless lan system | 20130070658 | 20130321 |
| The present invention relates to a method for operating a power save mode in a wireless LAN system. The method involves transmitting a power save multi-poll (PSMP) frame containing a power save mode (PSM) of a non-access point (AP) station (STA) to a first station and to a second station which are paired with an AP on the basis of multiple input multiple output (MIMO) technology. Information on the PSM contains downlink transmission start offset which indicates the point in time of starting a downlink transmission period, a downlink transmission duration which indicates the duration of the downlink transmission period, and transmission object station identification information. The method further involves transmitting a data frame to the first station and to the second station on the basis... |
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| Efficient multi-user multiple input multiple output (mu-mimo) | 20130070670 | 20130321 |
| Certain aspects of the present disclosure provide techniques and apparatus for combining the data (e.g., the channel station information (CSI) and the block acknowledgment (BA)) from one or more stations (STAs) capable of multi-user (MU) transmission in an effort to reduce the number of frames involved in a MU frame exchange. For certain aspects, the BA frames may be moved before a MU transmission and combined with the CSI frames, thereby effectively acknowledging a prior MU transmission. By reducing the number of frames involved, the efficiency of MU exchanges may be increased.
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| Switching method and system of multiple input multiple output mode | 20130072179 | 20130321 |
| A switching method and system for a Multiple Input Multiple Output (MIMO) mode are provided by the disclosure. The method comprises that: a NodeB determines to perform MIMO mode switching for a cell (S302); through a NodeB Application Part (NBAP) layer of an lub port, the NodeB sends a message which carries the cell identifier of the cell and the MIMO mode status information of the cell (S304) to a Radio Network Controller (RNC); the RNC updates the MIMO mode status of the cell by using the cell identifier and the MIMO mode status information (S306). The disclosure ensures normal communication between a piece of User Equipment (UE) and a NodeB.
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| Multiple input multiple output (mimo) based concurrent scan of neighbor cells | 20130072189 | 20130321 |
| Methods, systems, and devices are described for concurrently performing handoff-related measurements for neighbor cells using multiple input multiple output (MIMO) antenna resources. In one example, a mobile device is in communication with a serving cell. Handoff-related measurements of first wireless signals from a first neighbor cell are performed. The first wireless signals are received at first MIMO antenna resources of a device. Handoff-related measurements of second wireless signals from a second neighbor cell are performed, as well. The second wireless signals are received at second MIMO antenna resources concurrently with the first wireless signals received at the first MIMO antenna resources. The first handoff-related measurements and the second handoff-related measurements may be performed during a scan interval. A type of handoff-related measurement to perform may be... |
| Asynchronous protocol converter | 20130073771 | 20130321 |
| An asynchronous protocol converter, which is capable of flexibly carrying out communications between tens of IP cores in an asynchronous protocol Network-on-Chip system, and which is multiple input multiple output is provided. In an LSI (20), which comprises a plurality of IP cores (21), and routers (22) positioned adjacent to the plurality of IP cores (21), an asynchronous protocol converter (1) is positioned between adjacent routers (22). The asynchronous protocol converter (1) is configured to comprise: a two-to-four-phase converter (11) that is connected to an adjacent router (22a) within the LSI (20); a four-phase pipelined router (12) that is connected on the output side of the two-to-four-phase converter (11); a four-to-two-phase converter (13) that is connected to the outputs of the four-phase pipelined router (12); an... |
| Downlink transmission method for multiple input multiple output (mimo) system, and base station | 20130058246 | 20130307 |
| The disclosure provides a downlink transmission method for a Multiple Input Multiple Output (MIMO) system, and a base station, wherein the method comprises: a base station selecting a downlink MIMO mode in a downlink transmission mode in which a UE currently is by using a Channel Quality Indicator (CQI), a Rank Indicator (RI) and a Preceding Matrix Indicator (PMI) which are reported by the UE within a time window; and the base station transmitting data to the UE by using the selected downlink MIMO mode. The disclosure achieves the effect of increasing the coverage and capacity of the LTE system to the maximum.
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| Station-centric multi-user multiple input multiple output (mu-mimo) | 20130058273 | 20130307 |
| Certain aspects of the present disclosure provide techniques and apparatus for using a Media Access Control (MAC) address of a station (STA) sending a direct link multi-user multiple-input multiple-output (MU-MIMO) transmission such that one or more STAs receiving the transmission may interpret a group identifier (ID) indicating a group to which the STAs belong. Using the group ID and the MAC address allows a STA to independently manage its group IDs, independent of an access point (AP) or other STAs in a Basic Service Set (BSS).
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| Methods and apparatuses for generating and feeding back high rank adaptive codebook in multiple input multiple output system | 20130051487 | 20130228 |
| A method and device for generating and feeding back high rank adaptive codebook in multiple input multiple output system are disclosed in the embodiments of the invention. The method for generating high rank adaptive codebook includes: using different levels of a long time channel correlation matrix to transform different row vectors in high rank basic codebook, so as to aim at the directions of different eigenvectors of the long time channel correlation matrix; and using the transformed row vectors to construct the high rank adaptive codebook. The method of the invention has well system performance gain and no any additional feedback cost.
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| Methods and apparatus for channel estimation in mimo-ofdm communication system | 20130051505 | 20130228 |
| A wireless receiver is configured to perform a method of channel estimation in a multiple input multiple output (MIMO) network. The method includes despreading a vector of received samples to determine an average channel estimate for each of a plurality of multiplexed layers associated with the MIMO network, canceling inter-layer interference using the average channel estimates for the layers and obtaining a time-varying estimate for each layer, and estimating the channel using a two-dimensional minimum mean squared error (2D MMSE) technique.
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| Methods of receiving multiple input multiple output signals and related communication devices | 20130044797 | 20130221 |
| A MIMO (Multiple-Input-Multiple-Output) receiver may receive a plurality of MIMO transport blocks transmitted from a plurality of MIMO transmission antennas over a same carrier frequency. More particularly, a MIMO signal including the plurality of MIMO transport blocks may be received through a plurality of reception antennas, and respective measures of signal quality for each of the MIMO transport blocks may be computed. A MIMO transport block may be selected from the plurality of MIMO transport blocks based on the measures of signal quality, and the selected MIMO transport block may be decoded. Responsive to failure decoding the selected MIMO transport block, processing of all MIMO transport blocks received in the MIMO signal may be terminated. Related communication devices are also discussed.
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| Process for capture of carbon dioxide | 20130045154 | 20130221 |
| Certain aspects of the present disclosure relate to techniques for generating unified feedback framework for Multi User Multiple Input Multiple Output (MU-MIMO) enhancement based on indication of a preferred precoder pairings.
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| Downlink transmission method and enodeb in multiple input multiple output system | 20130039234 | 20130214 |
| The disclosure provides a downlink transmission method and an eNodeB in a multiple input multiple output system. The method includes: obtaining channel quality indication of a User Equipment (UE) to generate a channel condition indication value; obtaining channel rank indication of the UE to generate a channel correlation indication value; obtaining uplink channel impulse response estimation data of the UE to generate a channel variation state indication value; selecting a downlink transmission mode according to the channel condition indication value, the channel correlation indication value and the channel variation state indication value; transmitting data to the UE in the selected downlink transmission mode. Because of extracting information from a current channel as a basis of a subsequent selection of the downlink mode, the disclosure can greatly... |
| Methods and apparatus for scheduling paging monitoring intervals in a multimode mobile station | 20130040666 | 20130214 |
| Certain aspects of the present disclosure present methods and apparatus for resolving conflict between paging intervals of two different networks. For certain aspects, a multimode mobile station (MS) may select a network for monitoring based on a predefined criterion. For an aspect, the multimode MS may select a network whose paging interval starts earlier or a network whose paging interval finishes earlier. The multimode MS may also select a network that has a higher signal quality, or higher radio access technology (RAT)-based priority. In another aspect, if the multimode MS uses multiple input multiple output (MIMO), the multimode MS may split its available resources (e.g., receive chains) to simultaneously monitor paging signals transmitted by both networks.
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| Method and apparatus for uplink multiple input multiple output (mimo) transmission | 20130021898 | 20130124 |
| The present description relates to a wireless communication system, and more particularly, to a method and apparatus for uplink multiple input multiple output (MIMO) transmission. A method for performing an uplink MIMO transmission according to one embodiment of the present invention comprises the following steps: transmitting, from a first subframe, a first data block and a second data block through a first HARQ process and a second HARQ process, respectively; receiving, at a second subframe, uplink scheduling control information on the first data block and control information which indicates inactivation of the second data block; setting HARQ feedback information on the second data block to an ACK state; and performing retransmission of the first data block from a third subframe on the basis of the uplink... |
| Initiation of a mimo communication | 20130016709 | 20130117 |
| The present invention provides a method and apparatus for initiating a multiple input multiple output (MIMO) communication. The method and apparatus includes processing that begins by transmitting a frame formatted in accordance with a default MIMO active transmitter-receiver antenna configuration to a target receiver. The processing continues by receiving at least one response frame from the target receiver. The processing continues by determining a number of receiver antennas of the target receiver from the at least one response frame.
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| Plc device supporting mimo operations | 20130003877 | 20130103 |
| A communications device includes a PLC interface operable to couple at least two differing communication signals to at least two differing pairs of at least three conductors of a powerline medium. A processing module of the device and the PLC interface interact with a remote PLC device to determine connectivity of the remote PLC device to the PLC device via the at least three conductors of the powerline medium, select at least two conductor pairs of the powerline medium that communicatively couple the PLC device to the remote PLC device for Multiple Input Multiple Output (MIMO) signal servicing, and simultaneously transmit MIMO PLC signals to the remote PLC device via the at least two conductor pairs. The communications device may also include a non-PLC interface, with... |
| Multi user mimo detection utilizing averaged spatial whitening | 20130003896 | 20130103 |
| A system and method for decoding a Multi User (MU) Multiple Input Multiple Output (MIMO) signal is disclosed. The method comprises receiving a selected symbol in a tone of an MU-MIMO signal at a mobile communication device. A channel response for the selected symbol is identified. Spatial whitening is applied to the tone and the channel response using an average of a co-user interference plus noise matrix that is averaged over a selected number of tones. Maximal ratio combining is performed for the spatially whitened tone and the spatially whitened channel response matrix to decode the selected symbol out of the spatially whitened tone.
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| Plc/wireless device coordinated wireless transmissions | 20130007311 | 20130103 |
| A Power Line Communications (PLC) device includes a PLC interface, a wireless interface, a processing module, and memory. The PLC device communicates with a second PLC device via the PLC interface to establish a wireless transmission timing base, communicates with the second PLC device via the power mains to coordinate simultaneous wireless data transmissions to a client device from the PLC device and the second PLC device, wirelessly transmits data to the client device based upon the wireless transmission timing base and the coordination with the second PLC device. In combination the PLC devices' simultaneous wireless data transmissions may be Multiple Input Multiple Output (MIMO) transmissions, diversity transmissions, and/or beam formed transmissions. In another operation, the PLC device characterizes its surroundings based upon concurrent directional transmission... |
| Techniques for mimo beamforming for frequency selective channels in wireless communication systems | 20110013603 | 20110120 |
| An embodiment of the present invention provides an apparatus that may include a transceiver operable as a base station (BS) in a wireless network and adapted for multiple input multiple output (MIMO) beamforming and further adapted for wireless communication with a receiver that feeds back to the transceiver a plurality of beamforming matrixes per subband and interpolates the beamforming matrixes across the subband.
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| Rotating reference codebook that is used in a multiple-input multiple-output (mimo) communication system | 20110002404 | 20110106 |
| A rotating reference codebook used in a multiple input multiple output (MIMO) communication system is provided. The reference codebook includes codewords from a discrete Fourier transform (DFT) codebook. A base station and a terminal may calculate a rotation matrix based on a previous preferred codeword and a random codeword among codewords included in the DFT codebook. A reference codebook may be rotated using the rotation matrix and may be transformed to a new codebook. The reference codebook may include codewords of a polar cap codebook and the codewords of the DFT codebook. Even though the codewords of the DFT codebook are rotated, the codewords of the DFT codebook may remain in the new codebook as elements of the DFT codebook.
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| Multiple input multiple output (mimo) communication system for feedforwarding interference vector indicator | 20100329371 | 20101230 |
| Provided are a base station configured to provide an interference vector indicator to a terminal, and the terminal configured to recognize at least one remaining precoding vector using the interference vector indicator. Each of the base station and the terminal may configure a mapping table between at least one bit for the interference vector indicator indicating the at least one remaining precoding vector, and a plurality of vectors included in a codebook, based on a probability that the plurality of vectors may be included in a precoding matrix. In this instance, the base station may generate the interference vector indicator using the mapping table, and the terminal may recognize the at least one remaining precoding vector using the mapping table. The mapping table may be differently... |
| Multi-user multiple input multiple output wireless communications | 20100322166 | 20101223 |
| Certain aspects of the present disclosure relate to a method for enhanced multi-user multiple input multiple output (MU-MIMO) wireless communications. The proposed method may reduce and/or eliminate stringent frequency and time synchronization requirements for stations (STAs) to participate in a downlink MU-MIMO transaction by utilizing deterministic scheduling.
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| Mode selection for data transmission in wireless communication channels based on statistical parameters | 20100318861 | 20101216 |
| A method and communication system for selecting a mode for encoding data for transmission in a wireless communication channel between a transmit unit and a receive unit. The data is initially transmitted in an initial mode and the selection of the subsequent mode is based on a selection of first-order and second-order statistical parameters of short-term and long-term quality parameters. Suitable short-term quality parameters include signal-to-interference and noise ratio (SINR), signal-to-noise ratio (SNR), power level and suitable long-term quality parameters include error rates such as bit error rate (BER) and packet error rate (PER). The method of the invention can be employed in Multiple Input Multiple Output (MIMO), Multiple Input Single Output (MISO), Single Input Single Output (SISO) and Single Input Multiple Output (SIMO) communication systems... |
| Cluster parsing for signaling within multiple user, multiple access, and/or mimo wireless communications | 20100311432 | 20101209 |
| Cluster parsing for signaling within multi-user wireless communication systems. Cluster assignment allows for complete flexibility across a variety of operational parameters in accordance with communications provided from a transmitting wireless communication device to a number of receiving wireless communication devices. For example, an access point (AP) may communicate to a number of wireless stations (STAs) in accordance with multi-user multiple input multiple output (MU-MIMO), orthogonal frequency division multiple access (OFDMA), and/or MU-MIMO/OFDMA. The selectivity may involve employing different antenna for communicating with each of the respective, receiving wireless communication devices. Also, the formation of a cluster employed in such communications may involve using as few as one channel within one band, different channels within a single band, different channels within different bands, or other combinations. Signaling... |
| Receiver and method of receiving | 20100310017 | 20101209 |
| A receiver is arranged to detect and recover data from Orthogonal Frequency Division Multiplexed (OFDM) symbols, which are transmitted as first and second versions to form a multiple input multiple output (MISO) system and which carry pairs of data symbols encoded to form Alamouti cells. The receiver includes a channel estimator and corrector, which is arranged to form an estimate of the data symbols, by generating an estimate of first and second channels via which the first and second versions of the OFDM symbols are received. The receiver includes a channel estimator and corrector comprising a pilot data extractor which is arranged to extract the pilot data from the OFDM symbols, a frequency dimension interpolator which is arranged to interpolate between the pilot data received from... |
| Transmission acknowledgment within multiple user, multiple access, and/or mimo wireless communications | 20100310003 | 20101209 |
| Transmission acknowledgement within multi-user wireless communication systems. Within multi-access wireless communication systems such as those operating in accordance with multi-user multiple input multiple output (MU-MIMO), orthogonal frequency division multiple access (OFDMA), and/or MU-MIMO/OFDMA, acknowledgement of receipt (e.g., using ACKs) is provided back to the sending or transmitting wireless communication device from each (or a subset) of the intended recipient wireless communication devices. Appropriate coordination of these ACKs from the respective, receiving wireless communication devices may be performed using instructions embedded within a multi-user packet that is provided to the receiving wireless communication devices. Alternatively, polling as effectuated by the sending or transmitting wireless communication device may be used to give explicit direction to the respective, receiving wireless communication devices of the manner by which their respective... |
| Adaptive and selective frame formats within multiple user, multiple access, and/or mimo wireless communications | 20100310002 | 20101209 |
| Adaptive and selective frame formats within multiple user, multiple access, and/or multiple input multiple output (MIMO) wireless communications. A reconfigurable channel circuitry, that may be implemented to communicate with one, a subset, or all of various blocks within a communication device provides for adaptive and selective frame formatting of communications between the communication device and other communication devices. In a wireless communication device context, and also in the context of multiple user, multiple access, and/or MIMO communications (e.g., multi-user multiple input multiple output (MU-MIMO) and/or orthogonal frequency division multiplexing (OFDM), etc.), frame formatting may be adapted in accordance with a number of parameters including: the one or more users with which communications are to be made, the clusters (e.g., channel, band, frequency, etc.) employed for such... |
| Apparatus and method for calibration for cooperative multiple input multiple output in a wireless communication system | 20100303015 | 20101202 |
| A method and apparatus for multi-cell calibration in a wireless communication system supporting cooperative Multiple Input Multiple Output (MIMO) are provided. Operations of a Base Station (BS) according to the method include transmitting a first message indicating a start of multi-cell sounding calibration to a reference Mobile Station (MS); estimating an uplink channel matrix of the reference MS using pilot symbols received from the reference MS; transmitting pilot symbols for enabling the reference MS to estimate a downlink channel matrix; when receiving downlink channel information of cooperative BSs from the reference MS, transmitting second messages comprising the downlink channel information to the cooperative BSs; and determining a multi-cell calibration matrix using the uplink channel matrix and the downlink channel information received from the reference MS.
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| Hybrid dual dipole single slot antenna for mimo communication systems | 20100302115 | 20101202 |
| An antenna arrangement implemented within a printed circuit board (PCB) having three metal co planar layers, for use in multiple input multiple output (MIMO) communication systems. The antenna arrangement comprises a first dipole antenna and second dipole antenna, substantially symmetrical to the first dipole antenna a slot antenna positioned substantially between the first and the second dipole antennas. The antenna arrangement is implemented in three coplanar metal layers. The antennas are used for MIMO communication systems, specifically complying with IEEE 802.11n and are shaped such that their combined radiation pattern exhibits a substantially omni-directional radiation pattern.
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| Method for transmitting pilot allocation information to user equipment in a multi-user multiple input multiple output system | 20100298003 | 20101125 |
| A method for transmitting pilot allocation information from a base station for reception by at least one of a plurality of mobile stations participating in a Multi-User Multiple Input Multiple Output (MU-MIMO) communication, the method including the steps of generating pilot allocation information for the one mobile station, and transmitting the pilot allocation information for reception by the one mobile station, wherein the pilot allocation information includes at least one of a total number K of pilot streams allocated to the plurality of mobile stations, an index k representing a first pilot stream of one or more pilot streams allocated to the one mobile station among a plurality of pilot streams defined for a pilot pattern selected for the MU-MIMO communication, a number M of the... |
| Sorted qr decomposition method used in detection of mimo antenna system and detector using the same | 20100296598 | 20101125 |
| A sorted QR decomposition method used in a detection of a multiple input multiple output (MIMO) communication system is provided. First, whether a sorting-stop parameter of a channel transformation matrix of the MIMO communication system is greater than or equal to a sorting-stop threshold is determined. Then, whether energy of elements in a leftmost column within a process area of the channel transformation matrix is completely transferred to a top element in the leftmost column is determined. If the energy of the elements in the leftmost column within the process area is not yet completely transferred to the top element in the leftmost column, a unit process area of a process unit set is expanded.
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| Method for transmitting a signal in a multiple input multiple output system, and an apparatus for the same | 20100295730 | 20101125 |
| A method for transmitting a signal in a MBVD system is disclosed. A method for transmitting a signal in Multiple Input Multiple Output (MIMO) system includes, transmitting a training signal based on a predetermined sequence via at least one beamforming antenna group, the beamforming antenna group including a plurality of antennas, receiving first information indicating at least one available beamforming antenna group from among the beamforming antenna groups, and transmitting second information and antenna weight information, the second information indicating beamforming antenna group being determined on the basis of the first information, the antenna weight information being associated with a signal transmitted from the antenna group indicated by the second information.
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| Gain adjustment apparatus, method, and tangible machine-readable medium thereof for a multiple input multiple output wireless communication system | 20100291864 | 20101118 |
| A gain adjustment apparatus, a gain adjustment method, and a tangible machine-readable medium thereof for a multiple input multiple output (MIMO) wireless communication system are provided. The MIMO wireless communication system comprises source antennas, destination antennas, relay stations (RSs) and a relay transmission power limit value. The gain adjustment method comprises the following steps: adjusting the gain of one single RS according to a gain calculation; multiplying the gains of other relay stations by a scaling value for adjustment. According to aforesaid method, the present invention can increase the system capacity of the MIMO wireless communication system.
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| Method for transmitting dedicated reference signal, and method for receiving dedicated reference signal | 20100285810 | 20101111 |
| Provided are a method of transmitting a dedicated reference signal (DRS), a method of receiving a DRS, and a feedback method of a terminal. The method of transmitting a DRS includes determining a DRS transmitting resource for at least one terminal which is a target of transmission, and transmitting the DRS using the determined transmission resource and notifying the terminal of information about layer used by the terminal. The method of receiving a DRS includes determining a DRS receiving resource, receiving information about layer used by a terminal from a serving cell base station, and receiving the DRS for the terminal using the determined reception resource and the information about layer. Accordingly, a terminal can find the position and sequence of its DRS. In particular, in... |
| Open loop precoder cycling in mimo communications | 20100284484 | 20101111 |
| Data is transmitted over multiple input multiple output (MIMO) channels. Plural bit streams are modulated into multiple data symbol vectors. Each vector has a transmission rank with one vector for each MIMO channel. Transmission rank is the number of elements in a data symbol vector corresponding to the number of data streams being transmitted in parallel over each MIMO channel. The multiple data symbol vectors are preceded into multiple precoded symbol vectors using a plurality of precoder cycling sets, one set for each transmission rank including multiple different precoders. The precoders in each precoder cycling set are well-separated with respect to a plurality of distance measures. The precoding includes precoding each data symbol vector of a transmission rank with a precoder belonging to the precoder cycling... |
| Transmitting/receiving apparatus and method thereof in codebook based multiple antenna system | 20100272206 | 20101028 |
| A transmission/reception apparatus and a method thereof in a codebook-based multiple antenna system is provided. In a transmission method in a codebook-based Multiple Input Multiple Output (MIMO) system, control information is received from a receiver. A codeword is determined within an Open-Loop (OL)-MIMO codebook where a Closed-Loop (CL)-MIMO codebook is reused based on the control information. At least one data stream is transmitted via at least one antenna using the determined codeword.
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| Scattered pilot pattern and channel estimation method for mimo-ofdm systems | 20100271930 | 20101028 |
| Methods and apparatus are provided for inserting data symbols and pilot symbols in an OFDM (orthogonal frequency division multiplexing) transmission resource utilizing frequency hopping patterns for the data symbols and/or the pilot symbols. Data symbols and pilot symbols are allocated for down link (base station to mobile station) and up link (mobile station to bases station) transmission resources in a two-dimensional time-frequency pattern. For each antenna of a MIMO-OFDM (multiple input multiple output OFDM) communication system, pilot symbols are inserted in a scattered pattern in time-frequency and data symbols are inserted in an identical frequency-hopping pattern in time-frequency as that of other antennas.
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| Mimo wireless communication greenfield preamble formats | 20100266064 | 20101021 |
| A method for multiple input multiple output wireless communication begins by determining protocols of wireless communication devices within a proximal region. The method continues by determining whether the protocols of the wireless communication devices within the proximal region are of a like protocol. The method continues by determining the number of transmit antennas. The method continues, when the protocols of the wireless communication devices within the proximal region are of the like protocol, formatting a preamble of a frame of the wireless communication utilizing at least one of cyclic shifting of symbols, cyclic shifting of tones, sparse tone allocation, and sparse symbol allocation based on the number of transmit antennas.
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| Method and device for pre-coding in multiple input multiple output system | 20100266061 | 20101021 |
| A signal processing method in an MIMO multi-carrier system is disclosed comprising: receiving by a receiver signals of a plurality of sub-carriers transmitted from a transmitter; dividing the sub-carriers into a plurality of sub-carrier blocks according to the correlation between adjacent sub-carriers, each sub-carrier block containing K sub-carriers; selecting a feedback sub-carrier pre-coding matrix ( ) and a rotation matrix ( ) for each sub-carrier block, and then sending the information on the pre-coding matrix and the rotation matrix back to the transmitting end. The present invention provides the method and device for effectively settling the feedback problem in an MIMO/OFDMA system, thereby greatly reducing the number of pre-coding weight matrices needed to feed back to the transmitting device.
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| Group resource allocation techniques for ieee 802.16m | 20100266057 | 20101021 |
| Group resource allocation techniques for IEEE 802.16m are generally presented. In this regard a method is introduced comprising generating a plurality of bitmaps to identify resource allocations and multiple input multiple output (MIMO) modes for a group of broadband wireless mobile stations, wherein each mobile station in the group is assigned a position within a user bitmap to identify whether the mobile station is allocated frame resources and wherein the position within one or more MIMO bitmap(s) to identify a MIMO mode, and transmitting the bitmaps in a group resource allocation (GRA) information element (IE) of a broadband wireless media access protocol (MAP) frame portion. Other embodiments are also disclosed and claimed.
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| Adaptive automatic repeat-request apparatus and method for a multiple input multiple output system | 20100262885 | 20101014 |
| The present invention relates to an adaptive automatic repeat-request apparatus and method for an MIMO system including a transmitter and a receiver. The apparatus comprises an adaptive retransmission component located at the transmitter. The adaptive retransmission component uses a special frame structure that divides the transmission data in a frame into several sections according to the number of transmission antenna, and adds an individual error detecting code within each section. The transmission data are sent to the receiver through the several antennas. The receiver responds to the adaptive retransmission component feedback information of an acknowledgement or negative acknowledgement signal, and detected signal strength of data for each transmission antenna. After the receiving of the signal strength of transmission data, the retransmission signal vector for error data... |
| Apparatus and method for controlling power in distributed multiple input multiple output wireless communication system | 20100261498 | 20101014 |
| An apparatus is operable to control power of a base station in a distributed Multiple Input Multiple Output (MIMO) wireless communication system. At least one beamforming matrix is used for processing transmission signals to terminals included in a terminal set for a multiple access is determined. Minimum power values required for satisfying a minimum transmission rate of the terminals are determined. Whether optimum power values exist is determined using the minimum power values, the beamforming matrix, and a limit transmission power of the base station. When the optimum power values exist, transmission power values for respective terminals are determined in a range meeting the limit transmission power of the base station.
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| Multi-user mimo transmissions in wireless communication systems | 20100260059 | 20101014 |
| An apparatus and method for providing control information in a Multi User-Multiple Input Multiple Output (MU-MIMO) wireless communication system is provided. The method includes receiving a plurality of Resource Elements (REs) including Downlink Control Information (DCI), determining, using the DCI, a set of REs to which a plurality of Downlink Reference Signals (DRSs) may be mapped, determining remaining REs as REs to which data is mapped, and demodulating the data using a precoding vector of a DRS corresponding to the MS.
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| Apparatus and method for processing auto repeat request in multiple input multiple output system | 20100257422 | 20101007 |
| Provided are an apparatus and method for processing an ARQ in a MIMO system. The apparatus includes a storing unit for storing reordering thresholds of each receiving terminal and retransmission data; a priority managing unit for assigning a priority to a plurality of antenna groups in ascending order of a bit error rate of a wireless channel of each antenna group and managing the plurality of antenna groups based on the priorities; a data transmitting unit for transmitting retransmission data; and a controlling unit for controlling the data transmitting unit to transmit retransmission data within a range not exceeding a reordering threshold of a corresponding receiving terminal sequentially using an antenna group having the highest priority first.
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| Antenna installation method in a multiple input multiple output communication method | 20100248663 | 20100930 |
| A communication system includes a first communication apparatus and a second communication apparatus. The second communication apparatus transmits different signals from first and second antennas, and first and second antennas of the first communication apparatus receive the signals, respectively. An angle formed by a first line connecting the first communication apparatus and the first antenna of the second communication apparatus and a second line connecting the first communication apparatus and the second antenna of the second communication apparatus is set to be equal to or smaller than 180 degrees. A distance between the first and second antennas of the first communication apparatus is set to a specified value, which is determined by a signal wavelength and the angle formed by the first line and the second... |
| Detecting apparatus and method in mimo system | 20100246732 | 20100930 |
| Provided are a detecting apparatus in a Multiple Input Multiple Output (MIMO) system and a method thereof. The apparatus includes a first detector for decoding a received signal, to thereby generate a decoded vector; a candidate elements decision unit for calculating an instantaneous signal-to-interference plus noise ratio (SINR) value for each element of the decoded vector, and deciding candidate elements for estimating a transmission data based on the decoded vector by comparing the calculated instantaneous SINR value and a threshold value; a signal eliminator for generating a signal with respect to the candidate elements determined in the candidate elements decision unit and outputting a modified signal by subtracting the signal from the received signal; and a second detector for decoding the modified signal received from the... |
| Method and apparatus for power control of sounding reference signal (srs) transmission | 20100246561 | 20100930 |
| Methods and apparatus for sounding reference signal (SRS) power control for a wireless transmitter/receiver unit (WTRU) are disclosed. These methods and apparatus include methods and apparatus for carrier-specific and carrier-common SRS power control in WTRUs that utilize carrier aggregation techniques. These methods and apparatus also include methods and apparatus for SRS power control in WTRUs utilizing both carrier aggregation and time division multiplexing (TDM) techniques. Additionally, these methods and apparatus include methods and apparatus for SRS power control for WTRUs utilizing multiple input multiple output MIMO operation. Methods and apparatus for SRS overhead reduction and power management in a WTRU are also disclosed.
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| Method and system for adaptive modulations and signal field for closed loop multiple input multiple output (mimo) wireless local area network (wlan) system | 20100246541 | 20100930 |
| Aspects of a method and system for an optional closed loop mechanism with adaptive modulations for a multiple input multiple output (MIMO) WLAN system are provided. One aspect of the system may utilize properties of Eigenvalue analysis of MIMO systems to reduce the number of bits of binary information required to select a modulation type among a plurality of modulation types for each spatial stream among a plurality of spatial streams. This provides a reduction in the required number of bits when compared to other approaches and accordingly, enable greater flexibility in systems that utilize closed loop feedback mechanisms.
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| Codebook design method for multiple input multiple output system and method for using the codebook | 20090323841 | 20091231 |
| A multiple input multiple output (MIMO) communication method using a codebook is provided. The MIMO communication method may use one or more codebooks and the codebooks may change according to a transmission rank, a channel state of a user terminal, and/or a number of feedback bits. The one or more codebooks may be adaptively updated according to a time correlation coefficient of a channel.
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| Method for cooperative multi-antenna communication | 20090323643 | 20091231 |
| A method of cooperative multi-antenna communication between a base station and node existing in a wireless network is provided. A cooperative multi-antenna communication method includes receiving data from at least one node of a node group that receives data from a base station, performing multiple input multiple output (MIMO) signal processing with respect to the received data, the MIMO signal processing indicating signal processing performed in a receiving end of a MIMO system, and transmitting the signal processed data to at least one target node.
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| Repeater techniques for multiple input multiple output utilizing beam formers | 20090323582 | 20091231 |
| A repeater for a wireless communication network includes a first reception antenna for receiving a reception signal on a first path from one of an access point, another repeater or a wireless station device; a second reception antenna for receiving the reception signal on a second path; a reception weighting circuit for applying first and second weights to the reception signal to generate a first weighted reception signal and a second weighted reception signal; a signal combiner for combining the first and second weighted reception signals according to various mathematical combinations to generate a plurality of combined reception signals; and a transmission antenna for transmitting a transmission signal corresponding to one of the combined reception signals to one of the access point, the another repeater or... |
| Multiple input multiple output communication system and operating method thereof | 20090323545 | 20091231 |
| A multiple input multiple output (MIMO) communication system having a terminal and a base station. The terminal may calculate channel direction information and channel quality information in a zero-forcing mode based on expected different user interference. The terminal may also calculate channel direction information and channel quality information in a per user unitary rate control (PU2RC) mode by reusing the channel direction information and the channel quality information in the zero-forcing mode. The base station may design a preceding vector based on feedback information from the terminal.
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| Cognitive radio communication system using multiple input multiple output communication scheme | 20090304110 | 20091210 |
| A cognitive radio communication system using a multiple input multiple output (MIMO) communication technology is provided. A cognitive radio base station includes a plurality of antennas, a group setting unit to set at least one sensing terminal group that includes at least one sensing terminal among a plurality of terminals, and a signal generator to generate a transmission signal to transmit the transmission signal using channels formed between the plurality antennas and the plurality of terminals, so that the at least one sensing terminal is accorded a sensing time.
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| Wireless communication apparatus, system, method, and program | 20090296656 | 20091203 |
| A wireless communication apparatus includes a first storage unit configured to store each of a plurality of upper limit values of absolute values of additional signals that are set for a corresponding one of a plurality of first wireless communication apparatuses and are added when a plurality of modulation symbols to be transmitted to the first wireless communication apparatuses are precoded, a coding unit configured to decide each of a plurality of first values of the additional signals for a corresponding one of the first wireless communication apparatuses within ranges defined by the upper limit values, and precode the modulation symbols using the first values to obtain a plurality of transmission signals, and a first transmission unit configured to transmit, using multi-user MIMO (Multiple Input Multiple... |
| Spatial mode adaptation at the cell edge using interferer spatial correlation | 20090291699 | 20091126 |
| A system and method is proposed for adapting the spatial transmission strategy in a cellular MIMO (multiple input multiple output) communication system for the downlink. Spatial mode adaptation, the choice of multiplexing, transmit diversity, number of streams, space-time code family, and the like are performed slowly based on side information from other base stations. Base stations exchange their transmission plans with neighboring base stations and broadcast this information to active users. Each user measures its susceptibility to spatial interference and returns this information to the base station. The base station then schedules active users according to the decisions made in interfering base stations and the preferred transmission strategies of its own users.
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| Systems and methods for multiple-input multiple-output communications systems | 20090279631 | 20091112 |
| In a multiple input multiple output (MIMO) wireless communication system, there is provided a method for error correction. The method includes receiving an original signal in an initial MIMO format, detecting an error in the original signal, and notifying a transmitter of the error detected in the original signal. The method also includes receiving a new retransmitted signal in a first retransmitted MIMO format, different from the initial MIMO format, the new retransmitted signal including at least a fraction of encoded bits of the original signal. The method also includes correcting the original signal by applying the new retransmitted signal to the original signal.
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| Systems and methods for multiple-input multiple-output communications systems | 20090279631 | 20091112 |
| In a multiple input multiple output (MIMO) wireless communication system, there is provided a method for error correction. The method includes receiving an original signal in an initial MIMO format, detecting an error in the original signal, and notifying a transmitter of the error detected in the original signal. The method also includes receiving a new retransmitted signal in a first retransmitted MIMO format, different from the initial MIMO format, the new retransmitted signal including at least a fraction of encoded bits of the original signal. The method also includes correcting the original signal by applying the new retransmitted signal to the original signal.
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| Progressive feedback for high resolution limited feedback wireless communication | 20090274230 | 20091105 |
| A system and method is proposed for progressively quantizing channel state information for application in a MIMO (multiple input multiple output) communication system. A method includes computing an estimate of a communications channel between a subscriber unit and a base station, quantizing the estimate with a first codebook, thereby producing a first quantized estimate, quantizing an (n−1)-th quantized estimate with an n-th codebook, thereby producing an n-th quantized estimate, where n is an integer value ranging from 2 to R, R is a total number of quantizations of the estimate, wherein the n-th codebook is a localized codebook. The method also includes incrementing n, repeating the quantizing an (n−1)-th quantized estimate until n=R, and transmitting information based on the R quantized estimates to the base station.
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| Apparatuses and methods for transmission and reception in a codebook based closed-loop (cl)-multiple input multiple output (mimo) system | 20090274227 | 20091105 |
| Apparatuses and methods for transmission and reception in a Closed-Loop (CL)-Multiple Input Multiple Output (MIMO) system are provided. A codebook generation method includes determining weight vectors vi(i=1, . . . ,2L) for a codebook V(4, 1, L), where Nt of a codebook V(Nt,s,L) denotes a number of antennas, s denotes a number of streams, and L denotes a number of codebook index bits, determining a unitary matrix Ti using an i-th vector vi of the codebook V(4, 1, L), and determining an i-th matrix of the codebook V(4, 2, L) by selecting a first column of the unitary matrix Ti as a first column of a weight matrix and selecting a column selected from other columns excluding the first column of the unitary matrix Ti in... |
| Progressive feedback for high resolution limited feedback wireless communication | 20090274230 | 20091105 |
| A system and method is proposed for progressively quantizing channel state information for application in a MIMO (multiple input multiple output) communication system. A method includes computing an estimate of a communications channel between a subscriber unit and a base station, quantizing the estimate with a first codebook, thereby producing a first quantized estimate, quantizing an (n−1)-th quantized estimate with an n-th codebook, thereby producing an n-th quantized estimate, where n is an integer value ranging from 2 to R, R is a total number of quantizations of the estimate, wherein the n-th codebook is a localized codebook. The method also includes incrementing n, repeating the quantizing an (n−1)-th quantized estimate until n=R, and transmitting information based on the R quantized estimates to the base station.
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| Apparatuses and methods for transmission and reception in a codebook based closed-loop (cl)-multiple input multiple output (mimo) system | 20090274227 | 20091105 |
| Apparatuses and methods for transmission and reception in a Closed-Loop (CL)-Multiple Input Multiple Output (MIMO) system are provided. A codebook generation method includes determining weight vectors vi(i=1, . . . ,2L) for a codebook V(4, 1, L), where Nt of a codebook V(Nt,s,L) denotes a number of antennas, s denotes a number of streams, and L denotes a number of codebook index bits, determining a unitary matrix Ti using an i-th vector vi of the codebook V(4, 1, L), and determining an i-th matrix of the codebook V(4, 2, L) by selecting a first column of the unitary matrix Ti as a first column of a weight matrix and selecting a column selected from other columns excluding the first column of the unitary matrix Ti in... |
| Method and system for predicting channel quality index (cqi) values for maximum likelihood (ml) detection in a kxk multiple input multiple output (mimo) wireless system | 20090268834 | 20091029 |
| Aspects of a method and system for predicting CQI values for ML detection in a K×K MIMO system are presented. In one aspect of the system, a CQI value for a K×K MIMO communication system may be computed by decomposing the K×K MIMO system into a series of 2×2 MIMO systems. For each 2×2 MIMO system a CQI value may be computed by reverse mapping a PER computed for the 2×2 MIMO system and an SNR value for a SISO communication system. By summing CQI values among the series of 2×2 MIMO systems a CQI value for the K×K MIMO system may be computed. Based on the computed CQI value for the K×K MIMO system, a coding rate may be selected. The selected coding rate may... |
| Method and system for predicting channel quality index (cqi) values for maximum likelihood (ml) detection in a 2x2 multiple input multiple output (mimo) wireless system | 20090268833 | 20091029 |
| Aspects of a method and system for predicting CQI values for ML detection in a 2×2 MIMO system are presented. In one aspect of the system, a CQI value for a MIMO communication system may be computed based on a computed channel realization by reverse mapping the computed channel realization to a corresponding CQI value. Based on the computed CQI value, a coding rate may be selected. The coding rate may be selected from a lookup table, wherein the computed CQI value is utilized as an index to the lookup table. The reverse mapping may utilize a function, which is computed using radial basis function networks. In another aspect of the system, a joint mutual information value may be computed for the MIMO communication system. The... |
| Multiple input multiple output antenna | 20090267857 | 20091029 |
| A MIMO antenna (20) is disposed on a substrate (10) including a first surface (12) and a second surface (14). The MIMO antenna includes a pair of parallel first antennas (30) spaced apart from each other and a second antenna (40) spaced apart from the first antennas. The second antenna is disposed between the first antennas. Each of the first and second antennas is disposed on the first and second surface of the substrate and is a dipole antenna.
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| Multiple input multiple output antenna | 20090267857 | 20091029 |
| A MIMO antenna (20) is disposed on a substrate (10) including a first surface (12) and a second surface (14). The MIMO antenna includes a pair of parallel first antennas (30) spaced apart from each other and a second antenna (40) spaced apart from the first antennas. The second antenna is disposed between the first antennas. Each of the first and second antennas is disposed on the first and second surface of the substrate and is a dipole antenna.
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| Method and system for predicting channel quality index (cqi) values for maximum likelihood (ml) detection in a 2x2 multiple input multiple output (mimo) wireless system | 20090268833 | 20091029 |
| Aspects of a method and system for predicting CQI values for ML detection in a 2×2 MIMO system are presented. In one aspect of the system, a CQI value for a MIMO communication system may be computed based on a computed channel realization by reverse mapping the computed channel realization to a corresponding CQI value. Based on the computed CQI value, a coding rate may be selected. The coding rate may be selected from a lookup table, wherein the computed CQI value is utilized as an index to the lookup table. The reverse mapping may utilize a function, which is computed using radial basis function networks. In another aspect of the system, a joint mutual information value may be computed for the MIMO communication system. The... |
| Method and system for predicting channel quality index (cqi) values for maximum likelihood (ml) detection in a kxk multiple input multiple output (mimo) wireless system | 20090268834 | 20091029 |
| Aspects of a method and system for predicting CQI values for ML detection in a K×K MIMO system are presented. In one aspect of the system, a CQI value for a K×K MIMO communication system may be computed by decomposing the K×K MIMO system into a series of 2×2 MIMO systems. For each 2×2 MIMO system a CQI value may be computed by reverse mapping a PER computed for the 2×2 MIMO system and an SNR value for a SISO communication system. By summing CQI values among the series of 2×2 MIMO systems a CQI value for the K×K MIMO system may be computed. Based on the computed CQI value for the K×K MIMO system, a coding rate may be selected. The selected coding rate may... |
| Apparatus and method for precoding by midamble in multiple input multiple output wireless communication system | 20090262694 | 20091022 |
| A method and apparatus for performing codebook-based precoding in a Multiple Input Multiple Output (MIMO) wireless communication system are provided. In a method for operating a Base Station (BS) in a MIMO wireless communication system, a reference signal including pilot signals, which are divided by a predefined number of bands and are multiplied by respective codes in a codebook, is transmitted. One or more Mobile Stations (MSs) destined for spatial multiple access are selected using an index of a band and CQI of the band corresponding to the index, which are fed back from one or more MSs. A precoding matrix is generated to process data streams of the selected one or more MSs.
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| Apparatuses and methods for beamforming in a multiple input multiple output (mimo) wireless communication system based on hybrid division duplex | 20090262719 | 20091022 |
| Beamforming in a Multiple Input Multiple Output (MIMO) wireless communication system is provided. An apparatus includes an estimator for estimating a channel matrix of at least one terminal compliant with a Time Division Duplex (TDD) scheme; a processor for confirming information indicative of a channel matrix fed back from at least one terminal compliant with a Frequency Division Duplex (FDD) scheme; and a controller for determining precoding vectors or terminals to be connected in a spatial multiple access manner, using the channel matrix of the at least one terminal compliant with the TDD scheme and a principal vector of the at least one terminal compliant with the FDD scheme.
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| Long training sequence for mimo wlan systems | 20090262859 | 20091022 |
| A method for configuring a multiple input multiple output (MIMO) wireless communication begins by generating a plurality of preambles for a plurality of transmit antennas. Each of the plurality of preambles includes a carrier detection sequence at a legacy transmit rate, a first channel sounding at the legacy transmit rate, a signal field at the legacy transmit rate, and Z−1 channel soundings at a MIMO transmit rate, where L corresponds to a number of channel soundings. The method continues by simultaneously transmitting the plurality of preambles via the plurality of transmit antennas.
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| Feedback method for performing a feedback by using a codebook in mimo system | 20090257383 | 20091015 |
| A feedback method for performing a feedback by using a codebook in Multiple Input Multiple Output (MIMO) system includes receiving, by the mobile station, a MIMO mode type information, generating feedback information by using the codebook selected according to the MIMO mode type information, and transmitting the feedback information to the base station. The codebook includes a SU-MIMO codebook and a MU-MIMO codebook, and the MU-MIMO codebook is formed by extracting codebook elements from the SU-MIMO codebook. As a result, the method maximizes a system throughput simultaneously while effectively reducing an amount of feedback information.
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| Mimo tester | 20090251153 | 20091008 |
| A multiple input multiple output (MIMO) tester tests various communication parameters of a MIMO device. The MIMO tester includes a first attenuation circuit, a switch circuit, a controlling circuit, and a divider circuit. The first attenuation circuit adjusts an equivalent resistance of the MIMO tester, wherein the first attenuation circuit is electronically connected to the MIMO device. The switch circuit comprises a plurality of switch elements, wherein each switch element comprises an input end, a first output end and a second output end, wherein the switch circuit is electronically connected to the first attenuation circuit. The controlling circuit controls operation of the switch circuit, wherein the controlling circuit is electronically connected to the switch circuit. The divider circuit electronically connected to the switch circuit receives electronic... |
| Apparatus and method for detecting signal based on lattice reduction to support different coding scheme for each stream in multiple input multiple output wireless communication system | 20090252242 | 20091008 |
| An apparatus and method for detecting signals based on a Lattice Reduction (LR) algorithm in a Multiple Input Multiple Output (MIMO) wireless communication system are provided. The apparatus includes a plurality of operators for determining soft-decision values for respective streams by performing a soft modulo operation on respective symbol values included in a Receive (Rx) signal block multiplied by a lattice transformation matrix T, a plurality of inner decoders for determining Log Likelihood Ratio (LLR) values of codewords according to coding schemes for the respective streams by decoding the soft-decision values for the respective streams according to identical decoding scheme, a passer for restoring the LLR values representing the codewords generated in a transmitting end using the LLR values, and a plurality of outer decoders for... |
| Transmitter, receiver and method for controlling multiple input multiple output system | 20090252247 | 20091008 |
| Provided is a method of controlling a multiple input multiple output (MIMO) system. One embodiment of the method includes the steps of: estimating, at a receiver, a MIMO channel and detecting data streams using a successive interference cancellation scheme; calculating, at the receiver, S and P using the estimated channel and then feeding back information corresponding to (P1, P2, . . . , PM-1, SINR5M) to a transmitter, and determining, at the transmitter, a transfer rate and transmission power perstream using the fed-back information. Another embodiment of the method includes the steps of: estimating, at a receiver, a MIMO channel and detecting data streams using a signal received from an antenna; extracting, at the receiver, a feedback parameter to be fed back to the transmitter using... |
| Apparatus and method for beamforming based on generalized eigen-analysis in multiple input multiple output wireless communication system | 20090252250 | 20091008 |
| An apparatus and method for beamforming in a Multiple Input Multiple Output (MIMO) wireless communication system are provided. A Base Station (BS) includes a calculator for generating relational expressions between beamforming vectors of Mobile Stations (MSs) using channel information of each MS, for determining beamforming vector candidates of each MS from the relational expressions using generalized Eigen-analysis, and for selecting beamforming vectors for each MS from the beamforming vector candidates, and a plurality of Transmit (Tx) beamformers for performing Tx beamforming on dedicated pilot symbols to be transmitted to each MS using the beamforming vectors for each MS.
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| Mimo tester | 20090251153 | 20091008 |
| A multiple input multiple output (MIMO) tester tests various communication parameters of a MIMO device. The MIMO tester includes a first attenuation circuit, a switch circuit, a controlling circuit, and a divider circuit. The first attenuation circuit adjusts an equivalent resistance of the MIMO tester, wherein the first attenuation circuit is electronically connected to the MIMO device. The switch circuit comprises a plurality of switch elements, wherein each switch element comprises an input end, a first output end and a second output end, wherein the switch circuit is electronically connected to the first attenuation circuit. The controlling circuit controls operation of the switch circuit, wherein the controlling circuit is electronically connected to the switch circuit. The divider circuit electronically connected to the switch circuit receives electronic... |
| Apparatus and method for detecting signal based on lattice reduction to support different coding scheme for each stream in multiple input multiple output wireless communication system | 20090252242 | 20091008 |
| An apparatus and method for detecting signals based on a Lattice Reduction (LR) algorithm in a Multiple Input Multiple Output (MIMO) wireless communication system are provided. The apparatus includes a plurality of operators for determining soft-decision values for respective streams by performing a soft modulo operation on respective symbol values included in a Receive (Rx) signal block multiplied by a lattice transformation matrix T, a plurality of inner decoders for determining Log Likelihood Ratio (LLR) values of codewords according to coding schemes for the respective streams by decoding the soft-decision values for the respective streams according to identical decoding scheme, a passer for restoring the LLR values representing the codewords generated in a transmitting end using the LLR values, and a plurality of outer decoders for... |
| Transmitter, receiver and method for controlling multiple input multiple output system | 20090252247 | 20091008 |
| Provided is a method of controlling a multiple input multiple output (MIMO) system. One embodiment of the method includes the steps of: estimating, at a receiver, a MIMO channel and detecting data streams using a successive interference cancellation scheme; calculating, at the receiver, S and P using the estimated channel and then feeding back information corresponding to (P1, P2, . . . , PM-1, SINR5M) to a transmitter, and determining, at the transmitter, a transfer rate and transmission power perstream using the fed-back information. Another embodiment of the method includes the steps of: estimating, at a receiver, a MIMO channel and detecting data streams using a signal received from an antenna; extracting, at the receiver, a feedback parameter to be fed back to the transmitter using... |
| Multiple input multiple output communication system and a method of adaptively generating codebook | 20080317145 | 20081225 |
| A Multiple-Input Multiple-Output (MIMO) communication system and a method of adaptively generating a codebook are provided. A terminal includes a channel estimator to estimate a channel formed between a base station and the terminal to calculate a channel matrix and a codebook generator to adaptively generate a codebook based on a spatial correlation matrix of the channel matrix.
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| Power control and link adaptation scheme based on multi-user detection | 20080317155 | 20081225 |
| This invention provides a method for dynamically adjusting the transmitter power (PTX) and data rate in a communications system. The scheme is specifically intended for wireless systems based on Code Division Multiple Access (CDMA) or on Multiple Input Multiple Output (MIMO) technology, but can be applied to all systems in which a so-called “Multi-User Detector” can be used. The method includes that the decision whether to increase or decrease the transmitter power (PTX) is based on the Signal to Interference plus Noise Ratio (SINR) at the receiver (S2), whereby the receiver (S2) determines the interference (PIF) with a Multi-User Detector. The interference level (PIF) is then communicated to the sender (S1) or alternatively the receiver (S2) determines the optimal transmitter power level (PTX) and communicates this... |
| Apparatus and method for transmission and reception in multiple input multiple output system with replay station | 20080318520 | 20081225 |
| A multiple antenna system for using a relay station with multiple antennas is provided. The system includes a base station for determining encoded data processing procedure based on first and second channel state information, determining a relaying procedure of the relay station, and sending the relaying procedure to the relay station based on the first and second channel state information; wherein the encoded data is terminating to a mobile station; the relay station for receiving data and the relay procedure which the base station sent, converting and sending the data according to the relaying procedure, and sending the first channel state information to the base station as a measured state of channel which receives the data; and the mobile station for receiving the data which the... |
| Preamble formats for mimo wireless communications | 20080310351 | 20081218 |
| A method for generating a preamble of a frame for a multiple input multiple output (MIMO) wireless communication begins by, for each transmit antenna of the MIMO wireless communication, generating a carrier detect field, wherein, from transmit antenna to transmit antenna, the carrier detect field is cyclically shifted. The method continues by, for a first grouping of the transmit antennas of the MIMO wireless communication: generating a first guard interval following the carrier detect field; and generating at least one channel sounding field, wherein, from transmit antenna to transmit antenna in the first grouping, the at least one channel sounding field is cyclically shifted, and wherein the at least one channel sounding field follows the first guard interval. The method continues by, when the MIMO wireless... |
| Systems and methods for designing a sequence for code modulation of data and channel estimation | 20080310383 | 20081218 |
| A method for using a numerical method to design a sequence for code modulating data is described. An input multiple input multiple output signal is determined. A nearest tight frame to one or more given structured vectors is obtained. One or more structured vectors is obtained from the nearest tight frame. The one or more structured vectors is projected onto the space of circulant matrices. One or more classes of matrices that indicates the design of the sequence is outputted. Data is code modulated using the designed sequence.
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| Mimo wireless precoding system robust to power imbalance | 20080303699 | 20081211 |
| The present invention relates to methods and apparatus for preventing power imbalance in a multiple input multiple output (MIMO) wireless precoding system. According to one aspect of the present invention, a codebook is constructed with a first subset of codewords that are constant modulus matrices, and a second subset of codewords that are non-constant modulus matrices. A mapping scheme is established between the first subset of codewords and the second subset of codewords. When a unit of user equipment feeds back a first codeword that is a non-constant modulus matrix, the Node-B may replace the first codewords with a second codeword that is selected from the first subset of codewords and that corresponds to the first codeword in accordance with the mapping scheme.
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| Multi-user mimo feedback and transmission in a wireless communication system | 20080298482 | 20081204 |
| The present invention provides a method for feedback and transmission of multi-user (MU) multiple input multiple output (MIMO) in a wireless communication system. The method includes steps of selecting subset codebook or full code book based on traffic load of a base station, and broadcasting the selected codebook to user equipments. In high traffic load, subset codebook is selected, and in low traffic load, full codebook is selected. User stations calculated a channel quality indicator of a spatial codeword vector that is included in the selected codebook. Information of the maximum channel quality indicator is sent to the base station together with a precoder of the user equipment. The base station selects user equipments based on the information of the maximum channel quality indicator and precoder,... |
| Apparatus and method for detecting signal based on qr-decomposition in multiple input multiple output wireless communication system | 20080298491 | 20081204 |
| An apparatus and a method are provided for detecting N number of TX signals in a MIMO wireless communication system. The apparatus includes an RF processor, a channel estimator, and a signal detector. The RF processor converts signals, received through multiple antennas, into baseband signals. The channel estimator estimates channel information of the respective antennas by using the received signals. The signal detector arranges the baseband signals of the respective antennas on the basis of the channel information, calculates a threshold value of each stage, and selects symbols with a cumulative metric smaller than or equal to the threshold value as candidates at each stage, to detect a TX signal vector with N number of symbols.
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| Wireless communication mimo system with repeaters | 20080293358 | 20081127 |
| The present invention relates to a wireless communication system (C) comprising at least one base station (1) in a communication cell (2), from which base station (1) at least two essentially uncorrelated antenna radiation lobes (7, 8, 9, 10) are formed. Each antenna radiation lobe (7, 8, 9, 10) communicates a MIMO (Multiple Input Multiple Output) communication stream. The system (C) further comprises at least one repeating transmitter/receiver (repeater) (18, 19, 20, 21), which is arranged for communicating one of the MIMO communication streams to and/or from at least one UE (user equipment) (12). The present invention also relates to a repeater that is a part of the system (C), and a method for communicating at least two MIMO communication streams to and/or from at least... |
| Device and method for calibrating mimo systems | 20080285637 | 20081120 |
| A device and method for calibrating MIMO systems are disclosed. In one aspect, a calibration circuit comprises at least a first and a second input/output port, each arranged for being connected to a different transmitter/receiver pair of a multiple input multiple output (MIMO) system. The circuit further comprises at least a third and a fourth input/output port, each arranged for being connected to a different antenna. The circuit further comprises an attenuator having a first attenuator port and a second attenuator port. The circuit further comprises a first and a second non-reciprocal switch, the first switch being arranged for establishing a connection between the first input/output port and either the third input/output port or the first attenuator port, and the second switch arranged for establishing a... |
| Multiple-input multiple-output (mimo) detector incorporating efficient signal point search | 20080279298 | 20081113 |
| A novel and useful apparatus for and method of multiple input multiple output (MIMO) detection for use in MIMO based communication systems. The mechanism of the invention performs a simplified tree search utilizing a single stage expansion of the most likely first symbol candidates, in the case of a 2×2 MIMO system. The invention also provides a refinement mechanism that is operative to significantly improve the log likelihood (LLR) of the list of candidates. To improve the LLR, the mechanism applies refinements rounds to generate additional candidates for both first and second detected symbols.
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| Multiple-input multiple-output (mimo) detector incorporating efficient signal point search and soft information refinement | 20080279299 | 20081113 |
| A novel and useful apparatus for and method of multiple input multiple output (MIMO) detection for use in MIMO based communication systems. The mechanism of the invention performs a simplified tree search utilizing a single stage expansion of the most likely first symbol candidates, in the case of a 2×2 MIMO system. The invention also provides a refinement mechanism that is operative to significantly improve the soft information (i.e. log likelihood ratio) of the list of candidates. To improve the soft information, the mechanism applies one or more refinements rounds to generate additional candidates for both first and second detected symbols.
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| Codebook method for a multiple input multiple output wireless system | 20080273612 | 20081106 |
| A method for wireless encoding includes encoding wireless multiple input and multiple output signals in accordance with a codebook being one of a discrete codebook restricting elements of codebook entries to be within a predetermined finite set of complex numbers and a constant amplitude codebook including each entry in its codebook having equal column norm and equal row norm. In a preferred embodiment the digital codebook further includes restricting elements of a finite set in the discrete codebook to be in the form of ka+jkb for a base-k computer and the constant amplitude codebook further includes being obtained through a series of successive householder transformations. In a preferred embodiment the codebook is configured as one of a constrained codebook in which the codebook is configured for... |
| High isolation electronic multiple pole multiple throw switch | 20080265977 | 20081030 |
| A high isolation electronic multiple pole multiple throw (MPNT) switching device is formed as a ring circuit that includes plural poles, plural throws, plural series switches and plural means for shunting. Each series switch receives a control signal, and each means for shunting receives shunt control signals. In one aspect, the shunt control signals include control signals received by distant series switches. In another aspect, the shunt control signals include control signals received by adjacent series switches. In another aspect, the shunt control signals include signals complementary to signals received by adjacent series switches. In another aspect, the shunt control signals include pole DC potentials or throw DC potentials. In another aspect, a switching device may operate in multiple transmission mode or multiple input multiple output... |
| Method of controlling signal transmission in multi-input/multi-output system | 20080260060 | 20081023 |
| A method of controlling signal transmission in a Multiple Input Multiple Output (MIMO) communication system including selecting a modulation and code set (MCS) for each of M data streams transmitted via M transmitting antennas in a transmitting side of the MIMO system, and selectively selecting M−1 or fewer transmitting antennas from the M transmitting antennas for transmitting the data streams based on channel quality information indicative of a transmission performance of the selected MCS corresponding to each of the M transmitting antennas. In another example, the present invention provides a novel method of controlling signal transmission in a MIMO communication system including selecting M weight vectors for streams transmitted by each of M transmitting antennas in a transmitting side of the MIMO system, and selectively selecting... |
| Mimo polar, non-quadrature, cross-correlated quadrature gsm, tdma, spread spectrum, cdma, ofdm, ofdma and bluetooth systems | 20080253353 | 20081016 |
| Multiple Input Multiple Output (MIMO) system for receiving signals received from multiple inputs and transmitting signals to multiple output signal transmitters and multiple receivers for receiving transmitted signals. Processor for processing received location finder signals and for providing location finder processed baseband signals to a polar modulator for polar modulation of processed baseband signal. Processors for providing processed baseband signals to a non-quadrature or a quadrature modulator for modulation of processed baseband signal. Processor for processing and providing Orthogonal Frequency Division Multiplex Access (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA) signals for modulation and to multiple output transmitters. Processor for processing received signals and for providing processed baseband signals to a cross-correlator for cross-correlating and filtering in-phase and quadrature-phase baseband signals and for providing cross-correlated... |
| Apparatus and method of generating codebook for multiple input multiple output communication system | 20080256163 | 20081016 |
| An apparatus and method of generating a codebook. The codebook generation apparatus includes a matrix extender to generate a candidate matrix set by multiplying a base matrix and at least one diagonal matrix, wherein the at least one diagonal matrix includes elements of a constrained set as diagonal elements; and a codebook generator to generate the codebook where a minimum distance between the elements is maximized, based on the candidate matrix set. According to aspects of the present invention, it is possible to provide a precoding codebook that can reduce an amount of feedback from a terminal.
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| Precoding apparatus and method in a wireless communication system using multiple input multiple output | 20080240274 | 20081002 |
| A transmission apparatus in a Multiple Input Multiple Output (MIMO)-based wireless communication system. The transmission apparatus includes at least two antenna groups each having at least two antennas, wherein the antenna groups are spaced apart by a first distance and transmit antennas in each antenna group are spaced apart by a second distance which is shorter than the first distance. A channel coding and modulation unit channel-codes and modulates a desired transmission data stream. A precoding unit precodes the channel-coded and modulated signal separately for each antenna group and each antenna in the same antenna group. Thereafter, a transmission processing unit transmission-processes the output signal from the precoding unit.
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| Apparatus and method for automatic repeat request in multiple input multiple output system | 20080244350 | 20081002 |
| A method for an Automatic Repeat reQuest (ARQ) at a receiver in a Multiple Input Multiple Output (MIMO) system wherein when a received packet is erroneous and the erroneous packet is received from the weakest antenna in a Space Multiplexing (SM) mode, a first smallest number of retransmissions is computed to acquire a Signal to Noise Ratio (SNR) within or above an Adaptive Modulation and Coding (AMC) level. When the first number of the retransmissions is greater than a threshold, the sender is requested to retransmit the packets from the strongest antenna in the SM mode and when the first number of the retransmissions is smaller than the threshold, the sender is requested to retransmit the packets from the weakest antenna in the SM mode.
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| Systems and methods for reducing peak to average cross-correlation for sequences designed by alternating projections | 20080232235 | 20080925 |
| A method for using a numerical method to design reference signals for multiple input multiple output (MIMO) systems is described. An input multiple input multiple output signal is determined. A nearest tight frame to one or more given structured vectors is obtained. One or more structured vectors from the nearest tight frame are obtained. Orthogonal subsets are computed for a plurality of sequences, wherein each of the subsets is replaced with a matrix that comprises a function of one or more elements in each of the plurality of sequences and an identity matrix associated with the one or more elements. The one or more structured vectors are projected onto the space of circulant matrices. One or more classes of matrices associated with reference signals are outputted.
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| Methods and systems for ofdm multiple zone partitioning | 20080232504 | 20080925 |
| Aspects of the invention include methods and devices for inserting data and pilot symbols into Orthogonal Frequency Division Multiplexing (OFDM) frames having a time domain and a frequency domain. A method involves inserting in at least one zone of a first type a two dimensional array of data and pilot symbols in time and frequency and inserting in at least one zone of a second type a two dimensional array of data and pilot symbols in time and frequency. In some implementations the zone of the first type comprises common pilot symbols that can be detected by all receivers receiving the OFDM frame. In some implementations the zone of the second type comprises dedicated pilot symbols that are only detectable by a receiver that is aware... |
| Systems and methods for improving reference signals for spatially multiplexed cellular systems | 20080225688 | 20080918 |
| A method for using a numerical method to design reference signals for multiple input multiple output (MIMO) systems is described. An input multiple input multiple output signal is determined. A nearest tight frame to one or more given structured vectors is obtained. One or more structured vectors from the nearest tight frame are obtained. The one or more structured vectors are projected onto the space of circulant matrices. One or more classes of matrices associated with reference signals are outputted.
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| Apparatus for generating precoding matrix codebook for mimo system and method of the same | 20080225962 | 20080918 |
| An apparatus for generating a precoding matrix codebook includes a matrix group generator to generate a first group of unitary matrices based on a vector-based codebook for precoding of a multiple input multiple output (MIMO) communication scheme; a matrix group extender to extend the first group of unitary matrices to generate a second group of unitary matrices; and a matrix group selector to select a group of columns corresponding to a communication rank from each of the unitary matrices that are elements of the second group so that the columns are optimized based on a distance between the columns corresponding to the communication rank.
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| Apparatus and method for transmitting/receiving a signal in a mimo mobile communication system | 20080225970 | 20080918 |
| Disclosed is a method to transmit a signal in a Multiple Input Multiple Output (MIMO) mobile communication system. The method includes determining a Hybrid Automatic Repeat reQuest (HARQ) scheme to be used for a transmission signal; determining a MIMO scheme to be used for the transmission signal in accordance with the determined HARQ scheme; and transmitting the transmission signal using the determined HARQ scheme and the determined MIMO scheme.
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| Multiple band multiple input multiple output transceiver | 20080225971 | 20080918 |
| A MIMO transceiver integrated circuit (IC) includes a plurality of multiple band direct conversion transmitter sections, a plurality of multiple band direct conversion receiver sections, and a local oscillation generation module. Each of the plurality of multiple band direct conversion transmitter sections includes a transmit baseband module and a multiple frequency band transmission module. Each of the plurality of multiple band direct conversion receiver sections includes a multiple frequency band reception module and a receiver baseband module. The local oscillation generation module is operably coupled to generate the first frequency band local oscillation when the multiple band MIMO transceiver IC is in a first mode and operably coupled to generate the second frequency band local oscillation when the multiple band MIMO transceiver IC is in a... |
| Apparatus and method for spatial multiplexing with backward compatibility in a multiple input multiple output wireless communication system | 20080219375 | 20080911 |
| An apparatus and method for supporting both a receiver using a single antenna and a receiver using multiple antennas in a Multiple Input Multiple Output (MIMO) wireless communication system are provided. The apparatus and method in a MIMO wireless communication system include a first synthesizer for generating a first Transmit (Tx) signal by adding a first signal and a second signal, a second synthesizer for generating a second Tx signal by subtracting the second signal from the first signal and a plurality of transmitting units for transmitting the first Tx signal and the second Tx signal through corresponding antennas. Accordingly, receivers having either a single antenna or multiple antennas may be employed in the same communication system.
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| Methods and arrangements for communicating in a multiple input multiple output system | 20080219376 | 20080911 |
| Systems and methods for utilizing new communication standards in wireless local area networks are provided that also support legacy wireless stations. The method can include user equipment determining channel state information, selecting a unitary channel decomposition precoder format based on the determined channel state information and transmitting the precoder format information to a base station. During a return transmission the user equipment can receive user data with the precoder format information and utilize a non-linear detector to demodulate and decode the user data. Based on the reception the user equipment can estimate channel quality; and transmitting channel quality information as feedback.
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| Method and apparatus for managing control channel in a mobile communication system using multiple antennas | 20080212550 | 20080904 |
| A method for transmitting and receiving a control channel message in a mobile communication system using multiple antennas is provided. A base station determines whether a common pilot is used or a dedicated pilot is used. It also determines whether a corresponding Multiple Input Multiple Output (MIMO) mode is a Multi-CodeWord (MCW) MIMO mode or a Single CodeWord (SCW) MIMO mode, and determines whether knockdown precoding is used or ready-made precoding is used. The base station generates a control channel message field including a pilot pattern and a precoding type according to the determination results, and transmits the generated control channel message to the terminal. The terminal receives a control channel message transmitted from a base station. The terminal determines whether a common pilot is used... |
| Method and apparatus for transmitting and receiving control channel message in a mimo mobile communication system | 20080212700 | 20080904 |
| A method and apparatus for transmitting and receiving a control channel message in a Multiple Input Multiple Output (MIMO) mobile communication system are provided, in which a control channel message generator generates a pilot/MIMO field indicating at least one of a pilot format, a MIMO transmission rank being a number of transmission layers for transmitting encoded packet streams, and precoding information for MIMO data transmission, and outputs a control channel message including the pilot/MIMO field, and a transmission module converts the control channel message to a radio signal and transmits the radio signal to an MS. In the case of using common pilots for data demodulation and at least one of knock-down precoding and ready-made precoding for the MIMO transmission, the pilot/MIMO field includes information about... |
| Precoded pilot transmission for multi-user and single user mimo communications | 20080212702 | 20080904 |
| The disclosed method and apparatus include an WTRU-specific reference signal scheme that provides efficient precoded pilot transmission and effective channel estimation using dedicated pilot signals. The disclosed methods are efficient for both a single user (SU) and a multi user (MU) Multiple Input Multiple Output (MIMO) system.
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| Multiple input multiple output signal receiving apparatus with optimized performance | 20070298748 | 20071227 |
| A MIMO signal receiving apparatus includes a first antenna for receiving a first RF signal; a second antenna for receiving a second RF signal; a superheterodyne receiver for receiving one or all of the first and second RF signals into at least one first analog signal; a direct conversion receiver for converting one or all of the first and second RF signals into at least one second signal; and an antenna switching module coupling the first and second antennas to the superheterodyne receiver and the direct conversion receiver for electively directing the first and second RF signals to the superheterodyne receiver and/or the direct conversion receiver, depending on an antenna switch control signal indicating a signal quality derived from the first and second analog signals.
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| System and method for superposition coding and interference cancellation in a mimo system | 20070291867 | 20071220 |
| The present disclosure relates generally to a system and method for superposition coding and interference cancellation in a multiple input multiple output (MIMO) system. In one example, the method includes demultiplexing a signal of a user into at least first and second signal portions and demultiplexing a signal of another user into at least third and fourth signal portions. Superposition coding is performed on the first and third signal portions to form a first composite signal and performed on the second and fourth signal portions to form a second composite signal. The first composite signal is transmitted via at least one antenna of a MIMO system and the second composite signal is transmitted via at least another antenna of the MIMO system.
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| System and method for broadcast pre-coding in a mimo system | 20070291871 | 20071220 |
| The present disclosure relates generally to a system and method for broadcast pre-coding in a multiple input multiple output (MIMO) system. In one example, the method includes modulating a broadcast signal to create a stream of modulated symbols. Pre-coding is performed on each of the modulated symbols to break each modulated symbol into at least two pre-coded portions, and the two pre-coded portions of each modulated symbol are transmitted via at least two antennas.
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| Multi input multi output (mimo) orthogonal frequency division multiple access (ofdma) communication system | 20070274409 | 20071129 |
| An embodiment of the present invention is a technique to process signals in a communication system. In one embodiment, a plurality of signal processing units processes signals received from a plurality of antennae. The signal processor units are controlled by operational mode control signals. A channel estimator estimates channel responses using the processed signals according to an operational mode. An equalizer and combiner generates an equalized and combined signal using the received signals and the estimated channel responses. A Carrier to Interference Noise Ratio (CINR) estimator estimates CINR from the equalized and combined signal. The estimated CINR is used to generate the operational mode control signals. In another embodiment, a sub-carrier allocation controller generates sub-carrier allocation signals using an allocation base. A channel status information (CSI)... |
| Mimo wireless communication greenfield preamble formats | 20070263564 | 20071115 |
| A method for multiple input multiple output wireless communication begins by determining protocols of wireless communication devices within a proximal region. The method continues by determining whether the protocols of the wireless communication devices within the proximal region are of a like protocol. The method continues by determining the number of transmit antennas. The method continues, when the protocols of the wireless communication devices within the proximal region are of the like protocol, formatting a preamble of a frame of the wireless communication utilizing at least one of cyclic shifting of symbols, cyclic shifting of tones, sparse tone allocation, and sparse symbol allocation based on the number of transmit antennas.
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| Detection complexity reducing apparatus and method in multiple input multiple output (mimo) antenna system | 20070263569 | 20071115 |
| An apparatus and method for lowering a tree searching complexity in a Spatial Multiplexing (SM) Multiple Input Multiple Output (MIMO) antenna system are provided. A transmitting apparatus includes a generator for generating a plurality of transmit streams by spatial-multiplexing a transmit data, a determiner for determining modulation schemes to be applied to the plurality of the transmit streams respectively and a modulator for modulating the plurality of the transmit streams using at least two modulation schemes under control of the determiner. The receiver detects the signals by allocating the modulation scheme of the lowest order to the upper tree level.
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| Method and system for reordered qrv-lst (layered space time) detection for efficient processing for multiple input multiple output (mimo) communication systems | 20070258536 | 20071108 |
| Aspects of a method and system for reordered QRV-LST (layered space time) detection for efficient processing for multiple input multiple output (MIMO) communication systems are presented. The method may include receiving an ordered plurality of signals wherein each of the ordered plurality of received signals comprises information contained in an ordered plurality of spatial streams. Each spatial stream may comprise one or more frequency carriers, or tones. Information, or data, contained in a corresponding one of the ordered plurality of spatial streams may be detected. The order in which the information is detected may be determined for each individual frequency carrier.
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| Reduced complexity frequency domain equalization of multiple input multiple output channels | 20070253476 | 20071101 |
| A method for equalizing a frequency-selective transmission channel (103) with N inputs and MR outputs is shown, the transmission channel representable in a transformation domain based on N orthogonal sub-carriers, and wherein the transmission characteristics from the MT inputs to the MR outputs for each of the N respective orthogonal sub-carriers are represented by N respective sub-carrier channels (201), the method using (904) equalization filters (301, 302) for at least two of the N sub-carrier channels, wherein at least one set (501) of sub-carrier channels comprising at least two of the N sub-carrier channels is formed (901), wherein for at least one sub-carrier channel, a first-type equalization filter is used that is determined (902) based on a representation of at least one sub-carrier channel, and wherein... |
| System and method for communication with adaptive link control | 20070254608 | 20071101 |
| One inventive aspect relates to a system and method for performing communication between a transmitting device and a receiving device along a communication path. The transmit device and the receive device each have at least one antenna. At least one of the devices has a plurality of antennas. The method comprises determining first information about the communication path. The method further comprises determining second information about the desired performance parameters of the communication. The method further comprises selecting based on the first and second information a mode of communication from a predetermined set of communication modes. The set includes a Single Input Single Output (SISO) and at least one Multiple Input Multiple Output (MIMO) communication scheme. The method further comprises performing communication in accordance with the... |
| Automatic repeat request (arq) apparatus and method of multiple input multiple output (mimo) system | 20070245205 | 20071018 |
| Automatic Repeat reQuest (ARQ) apparatus and method of a Multiple Input Multiple Output (MIMO system are provided. The ARQ method includes decoding, when one or more packets are received, the received packets and trying to detect the decoded packets; and storing, when error is detected from the packets, the corresponding error packet, requesting a transmitter to retransmit N-ary packets from which the error is detected and to transmit (M-N)-ary new packets when the number of the error packets N is smaller than the total number of the transmitted packets M. Accordingly, the error rate of the retransmitted data can be minimized, the number of retransmissions can be decreased, and the overall data transmission rate can be raised.
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| Start of packet detection for multiple receiver combining and multiple input multiple output radio receivers | 20070230403 | 20071004 |
| A method and an apparatus for detecting the start-of-packet in a wireless receiver operating in a packetized wireless network. One method embodiment includes calculating a plurality of start of packet (SOP) indicators, each for one or more of a plurality of receive chains in the receiver; determining one or more linear combinations of respective pluralities of the calculated SOP indicators to form one or more combined SOP indicators; comparing each of a plurality of SOP indicators or combined SOP indicators, including at least one of the combined SOP indicators to a respective threshold to form one or more respective SOP events; and, in the case there is more than one SOP event, determining a logic function of the SOP events to form a SOP decision event.
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| Iterative detection and decoding apparatus and method in mimo system | 20070230609 | 20071004 |
| An iterative detection and decoding method in a Multiple Input Multiple Output (MIMO) system includes detecting entire MIMO nodes to generate soft decision values; decoding a first soft decision value among the soft decision values; determining whether to perform an iterative detection and decoding by measuring reliability of the decoded first decoding signal; generating a soft decision value by performing a redetection of a MIMO node containing the soft decision value, when the decoded soft decision value is iteratively detected and decoded; and decoding a second soft decision value among the soft decision values.
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| Apparatus and method for detecting a signal in a communication system using multiple input multiple output scheme | 20070230628 | 20071004 |
| An apparatus is provided for detecting a signal in a communication system using a Multiple Input Multiple Output (MIMO) scheme. The signal detection apparatus includes a detector for generating second matrixes by extending a first matrix composed of channel response vectors, generating specific matrixes by decomposing the second matrixes, generating a lattice point of vectors constituting the second matrixes, estimating a signal using the generated specific matrixes and lattice point, and detecting the estimated signal as a received signal if the estimated signal has a value within a predetermined allowable range.
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| Adaptive mimo wireless communicationsi system | 20070223367 | 20070927 |
| A GMIMO-JD (Generalized Multiple Input Multiple Output—Joint Detection) method to be executed by a receiver for use in MIMO (Multiple Input Multiple Output) wireless communication systems, comprising: receiving the radio signal sent form a transmitter; estimating the propagation channel quality of the radio signal; sending a feedback information to the transmitter according to the estimation result such that the transmitter can choose and reconfigure a GMIMO architecture suitable for the propagation channel according to the feedback information; reconfiguring a GJD architecture suitable for the receiver according to the estimation result; processing the received radio signal from the transmitter by exploiting the chosen GJD architecture.
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| Apparatus and method for transmitting/receiving signal in a communication system using multiple input multiple output scheme | 20070223618 | 20070927 |
| An apparatus for transmitting a signal in a Multiple Input Multiple Output (MIMO) communication system includes determining transmission antennas to be used by a signal transmission apparatus depending on channel quality information received from a reception apparatus, encoding an input information data stream into a codeword using a coding scheme, mapping the codeword using a MIMO mapping scheme thereby generating at least one mapped symbol, modulating the mapped symbols into modulation symbols according to a modulation scheme, and performing transmission processing on the modulation symbols thereby generating transmission streams, and transmitting the transmission streams via the determined transmission antennas.
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| Method and system for utilizing givens rotation to reduce feedback information overhead | 20070213013 | 20070913 |
| Aspects of a method and system for utilizing Givens rotation to reduce feedback information overhead are presented. Aspects of the system may include a receiver that may enable computation of a beamforming matrix for signals received from a transmitter in a multiple input multiple output (MIMO) communication system. The receiver may enable computation of Givens rotation angles and/or phase rotation angles based on the computed beamforming matrix. The receiver may also enable feedback of information containing the Givens rotation angles and/or phase rotation angles to the transmitter.
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| Antenna apparatus for multiple input multiple output communication | 20070205959 | 20070906 |
| At least two antennas are selected from a plurality of antennas which consist of at least two antennas having polarization characteristics or directivities different from one another, and which are arranged such that spatial fading correlations between the antennas are low, and a multiple input multiple output communication is conducted by using the selected antennas.
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| Method and system for an adaptive vblast receiver for wireless multiple input multiple output (mimo) detection | 20070206696 | 20070906 |
| Various aspects of a system for an adaptive VBLAST receiver for wireless MIMO detection may comprise utilizing log likelihood ratios (LLR) to selectively cancel interference in a received signal when information contained in one or more layers is encoded. Following the selective cancellation of interference, further computations may be performed on the residual received signal. Various aspects of the invention may comprise a linear detector with improved performance in comparison to some conventional VBLAST receivers. Performance may be measured by, for example, a packet error rate (PER) for a given signal to noise ratio (SNR) associated with the received signal.
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| Signal receiving method and signal receiving equipment for multiple input multiple output wireless communication system | 20070206697 | 20070906 |
| In a multiple input/multiple output wireless communication system, a receiving signal is compensated based on a wireless channel state information matrix converted by lattice reduction. The distortion of the modulation constellation diagram of a signal is considered, a detection signal is processed, and an intermediate signal table containing at least two intermediate signals is obtained to increase the area for the detection signal to be decided correctly, thereby to improve the possibility of the correct detection of the signal. Then a candidate signal table is obtained from the intermediate signal table and, based on the candidate signal table, a decision signal for a transmitting signal is obtained, thereby improving the accuracy of the detection of the transmitting signal. When at a high signal-to-noise ratio, the bit-error... |
| Transmission/reception apparatus and method for supporting mimo technology in a forward link of a high rate packet data system | 20070206698 | 20070906 |
| An apparatus and method for allocating dedicated pilots for supporting MIMO and setting MIMO-only interlace slots in a CDMA 2000 Nx-EV-DO compatible system. The method includes determining whether a current interlace is a particular interlace in which a Multiple Input Multiple Output (MIMO) signal for channel estimation in a receiver is inserted; and inserting the MIMO signal into the particular interlace when the current interlace is the particular interlace and then transmitting the MIMO signal according to a predetermined transmission scheme. By the apparatus and method, it is possible to effectively use the MIMO in a system in which EV-DO users, MIMO EV-DO users, OFDM users, MIMO-OFDM users co-exist.
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| Multiple input multiple output communication apparatus | 20070207837 | 20070906 |
| Signal to interference plus noise ratio information, delay spread information, or condition number information of a channel matrix in a multiple input multiple output communication are taken into account in addition to spatial fading correlation information for selecting a combination of at least two antennas from a plurality of antennas, then, the multiple input multiple output communication is conducted by using the selected antennas.
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| Apparatus, system and method for providing a multiple input/multiple output (mimo) channel interface | 20070201536 | 20070830 |
| A system, method and apparatus, provide for the utilization of the MIMO technique with single-antenna communication devices that maximize high-speed broadband communication. The apparatus includes a wireless communication interface (WCI) device configured to exchange wireless signals with a base station through a multiple input multiple output (MIMO) air interface and to exchange a corresponding set of wireless signals with an access terminal through a wideband air interface having a greater bandwidth than the bandwidth of the MIMO air interface. The system includes a plurality of WCI devices communicating with the base station and exchanging corresponding signals with the access terminal.
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| Method and system for minimizing effects of transmitter impairments in multiple input multiple output (mimo) beamforming communication systems | 20070201575 | 20070830 |
| Aspects of a method and system for minimizing effects of transmitter impairments in multiple input multiple output (MIMO) beamforming communication systems are presented. In one aspect of a system for minimizing effects of transmitter impairments, a MIMO transmitter may enable nulling of transmitter-induced noise by adjusting at least a portion of a plurality of signals transmitted based on a transmitter error vector magnitude (EVM). The transmitter may enable transmission of the plurality of signals subsequent to the nulling. In another aspect of a system for minimizing effects of transmitter impairments a MIMO receiver may enable nulling of transmitter-induced noise contained in a plurality of received signals based on a transmitter EVM. Each of the plurality of received signals may include information contained in a plurality of... |
| Apparatus and method for signal reception in multiple input multiple output (mimo) communication system | 20070201577 | 20070830 |
| A method for signal reception in a Multiple-Input-Multiple-Output (MIMO) communication system is provided. The method enhances the efficiency of signal reception in the MIMO system and simplifies the algorithms of signal reception and soft decoding metrics generation. In other words, soft decisions are generated according to correlations between metrics corresponding to least reliable bits based on MMSE linear estimation and noise variance estimation is provided to improve performance when an error is generated in channel matrix H estimation.
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| Predicting future changes to strengths of paths in mimo systems | 20070202817 | 20070830 |
| According to one embodiment of the invention, a system and a method for maintaining a first history of strength of a first transmission path between a first wireless node and a second wireless node in a multiple input multiple output (MIMO) communication system, maintaining a second history of strength of a second transmission path between a third wireless node and the second wireless node in the MIMO communication system, performing a spatiotemporal correlation between the first history and the second history to determine if any changes in the strength of the first transmission path is observed, and predicting future changes to strength of the second transmission path between the third wireless node and the second wireless node based on the performed special correlation between the first... |
| Method and system for minimum mean squared error soft interference cancellation (mmse-sic) based suboptimal maximum likelihood (ml) detection for multiple input multiple output (mimo) wireless system | 20070198719 | 20070823 |
| Various aspects of a method for minimum mean square error soft interference cancellation (MMSE-SIC) based sub-optimal maximum likelihood (ML) detection for a multiple input multiple output (MIMO) wireless system may comprise selecting at least one constellation point in a constellation map based on at least one of a plurality of received symbols. A number of the at least one constellation point may be less than or equal to a number of previously selected constellation points in a previous constellation map. At least one of the plurality of received symbols may be decoded based on the selected at least one constellation point.
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| Apparatus and method for orthogonal spatial multiplexing in a closed-loop mimo-ofdm system | 20070189416 | 20070816 |
| An Orthogonal Spatial Multiplexing (OSM) apparatus and method in a closed-loop Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system are provided. In the OSM method, a basic signal model is set and transmission symbols are encoded. A real-valued system model corresponding to the basic signal model is obtained. To achieve orthogonality, rotations angles are calculated and are applied to the encoded transmission symbols.
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| Adaptive orthogonal scheduling for virtual mimo system | 20070171808 | 20070726 |
| A system and method for scheduling cooperative uplink transmissions in a virtual multiple input multiple output (MIMO) wireless communication environment are provided. More specifically, the present invention provides both random and channel aware orthogonal scheduling techniques for identifying a sub-set of N mobile terminals to provide cooperative uplink transmissions for each transmit time interval.
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| Wireless headphones with dual antennas | 20070173300 | 20070726 |
| A wireless headphone assembly has left and right speakers attached to ends of a headphone body, and at least two antennas, e.g., one located at each speaker. Since multiple antennas are used, reception can be improved using one of several approaches, e.g., simple selection of the “best” antenna, multiplexing antenna input, using diversity algorithms such as multiple input multiple output (MIMO) algorithms, etc.
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| Multiple input, multiple output wireless communication system, associated methods and data structures | 20070149180 | 20070628 |
| Embodiments of multiple input multiple output wireless communication systems, associated methods and data structures are generally described herein.
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| Method and system for parsing bits in an interleaver for adaptive modulations in a multiple input multiple output (mimo) wireless local area network (wlan) system | 20060274687 | 20061207 |
| Aspects of a method and system for parsing bits in an interleaver for adaptive modulations in a multiple input multiple output (MIMO) wireless local area network (WLAN) system are provided. The interleaver may generate a lookup table, which is utilized to assign at least one binary bit of information, among a plurality of binary bits of information to be transmitted, to at least one of a plurality of spatial streams. The lookup table may be utilized to assign binary bits of information among the plurality of spatial streams to improve performance of a MIMO transceiver.
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| Methods and apparatus for backwards compatible communication in a multiple input multiple output communication system with lower order receivers | 20060252386 | 20061109 |
| A method and apparatus are disclosed for transmitting symbols in a multiple antenna wireless communication system, such that the symbols can be interpreted by a lower order receiver (i.e., a receiver having a fewer number of antennas than the transmitter). For example, subcarriers from one or more symbols can be transmitted such that each of the subcarriers are active on only one of the antennas at a given time. In one implementation, the subcarriers are diagonally loaded across logically adjacent antennas. The symbols can include one or more long training symbols and optionally a SIGNAL field that indicates a duration that a receiver should defer until a subsequent transmission. In this manner, a transmitter in accordance with the present invention may be backwards compatible with a... |
| Rf transceiver having adaptive modulation | 20060239366 | 20061026 |
| A modulation control module for use in an RF transceiver, the modulation control module includes a processing module and memory. The memory is operably coupled to the processing module, wherein the memory stores operational instructions that causes the processing module to: receive a multiple path channel estimation; and determining, for each transmit path of a multiple input multiple output (MIMO) wireless communication, a modulation control signal based on a corresponding portion of the multiple path channel estimation.
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| Adaptive modulation in a multiple input multiple output wireless communication system with optional beamforming | 20060239375 | 20061026 |
| A transmitting MIMO wireless device transmits a training sequence to a receiving MIMO wireless device. The receiving MIMO wireless device estimates a channel response based upon the training sequence, determines an estimated transmitter beamforming unitary matrix and a transmit path quality matrix, and then transmits some/all of these parameters to the transmitting MIMO wireless device. The transmitting MIMO wireless device receives these components and determines a modulation to be employed for each of a plurality of data streams. The transmitting MIMO wireless device transmits a data frame to the receiving MIMO wireless device that includes a short training sequence, a long training sequence, a signal field with demodulation control signals, and a data payload for each of multiple data streams. According to one embodiment of the... |
| Master/slave oscillation production and distribution in a multiple rf transceiver system supporting mimo operations | 20060221905 | 20061005 |
| A multiple input multiple output (MIMO) RF transceiver system includes a plurality of RF transceiver ICs, a crystal, and master oscillation coupling. Each of the plurality of RF transceiver ICs includes crystal oscillator circuitry. Crystal oscillator circuitry of the first RF transceiver IC and a crystal are operable to produce a master oscillation. Master oscillation coupling couples the master oscillation produced by the first RF transceiver IC to the at least one other RF transceiver IC. In one embodiment, the master oscillation is passed from the first RF transceiver IC to each other transceiver RF ICs. In another embodiment, the master oscillation is used to produce a slave oscillation at a second RF transceiver IC and subsequent RF transceiver ICs produce there own slave oscillation based... |
| Multiple band multiple input multiple output transceiver integrated circuit | 20060222100 | 20061005 |
| A MIMO transceiver integrated circuit (IC) includes a plurality of multiple band direct conversion transmitter sections, a plurality of multiple band direct conversion receiver sections, and a local oscillation generation module. Each of the plurality of multiple band direct conversion transmitter sections includes a transmit baseband module and a multiple frequency band transmission module. Each of the plurality of multiple band direct conversion receiver sections includes a multiple frequency band reception module and a receiver baseband module. The local oscillation generation module is operably coupled to generate the first frequency band local oscillation when the multiple band MIMO transceiver IC is in a first mode and operably coupled to generate the second frequency band local oscillation when the multiple band MIMO transceiver IC is in a... |
| Transmission apparatus and method for mimo system | 20060215784 | 20060928 |
| A transmitter in a multiple input multiple output (MIMO) communication system is provided. The transmitter includes a multiplexer for multiplexing an input bit stream into a plurality of bit streams, and outputting the bit streams in parallel; a bit-order rearranger for reordering bits constituting the bit streams, which are output from the multiplexer in the same time period, and outputting the reordered bits as reordered bit streams; and a modulator for modulating the parallel reordered bit streams output from the bit-order rearranger according to their associated modulation schemes, and transmitting the modulated symbols via their associated antennas.
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| Method and system for adaptive modulations and signal field for closed loop multiple input multiple output (mimo) wireless local area network (wlan) system | 20060203785 | 20060914 |
| Aspects of a method and system for an optional closed loop mechanism with adaptive modulations for a multiple input multiple output (MIMO) WLAN system are provided. One aspect of the system may utilize properties of Eigenvalue analysis of MIMO systems to reduce the number of bits of binary information required to select a modulation type among a plurality of modulation types for each spatial stream among a plurality of spatial streams. This provides a reduction in the required number of bits when compared to other approaches and accordingly, enable greater flexibility in systems that utilize closed loop feedback mechanisms.
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| Method and system for parsing bits in an interleaver for adaptive modulations in a multiple input multiple output (mimo) wireless local area network (wlan) system | 20060203836 | 20060914 |
| Aspects of a method and system for parsing bits in an interleaver for adaptive modulations in a multiple input multiple output (MIMO) wireless local area network (WLAN) system are provided. The interleaver may assign at least one binary bit of information, among a plurality of binary bits of information to be transmitted, to one of a plurality of spatial streams based on a current modulation type. A subsequent binary bit of information, among a plurality of binary bits of information to be transmitted, may be assigned to a subsequent one of the plurality of spatial streams based on the current modulation type and/or a subsequent modulation type. The interleaver may assign at least one additional bit of information, among the plurality of binary bits of information... |
| Physical layer repeater configuration for increasing mimo performance | 20060193271 | 20060831 |
| A wireless network includes at least one Multiple Input Multiple Output (MIMO) wireless network station and two or more physical layer repeaters. Each of the physical layer repeaters is for receiving a wireless signal to or from the at least one MIMO wireless network station and re-transmitting the wireless signal while continuing to receive the wireless signal. The repeaters may be either frequency translating repeaters or non-frequency translating repeaters.
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| Gain estimation for multiple receiver systems | 20060193410 | 20060831 |
| The present invention provides a method for automated gain control associated with the receipt of multiple input multiple output (MIMO) radio frequency (RF) packet communications. This involves receiving multiple MIMO RF packet communications with multiple receiver pathways, wherein the RF packet communications each comprise a preamble and data. A gain is applied to the RF packet communication with a programmable gain amplifier operable to adjust the gain based on received control signals from the baseband processing module. The RF packet communication(s) are down converted to produce a baseband packet communication. This communication in then converted from an analog signal to a digital signal. The digital signal is sampled for a valid preamble. The results of the sampled digital signal are used to produce a control signals... |
| Method and system for optional closed loop mechanism with adaptive modulations for multiple input multiple output (mimo) wireless local area network (wlan) system | 20060176972 | 20060810 |
| Aspects of a method and system for an optional closed loop mechanism with adaptive modulations for a multiple input multiple output (MIMO) WLAN system are provided. One aspect of the system may comprise a receiver that may select, for a plurality of spatial streams, a modulation type and/or coding rate. The receiver may communicate a message, via an RF channel, that comprises a plurality of modulation types and/or coding rates. The receiver may configure for receiving subsequent data based on at least one selected modulation type and/or coding rate. Another aspect of the system may comprise a transmitter that may receive a message, via an RF channel, that comprises a specification of, for a plurality of spatial streams, a plurality of modulation types and/or coding rates.... |
| Transmission method for mimo system | 20060176993 | 20060810 |
| A signal transmission method for a multiple input multiple output (MIMO) communication system. A transmitter having a plurality of transmission antennas receives antenna selection information from a receiver having at least one reception antenna. The transmitter selects at least two transmission antennas based on the antenna selection information, beamforms space-time block coding (STBC)-coded input signals with a weighting matrix, and transmits the beamformed signals via the selected transmission antennas. The antenna selection information is generated based on exact channel characteristics and statistical channel characteristics for the transmission antennas and a spatial correlation between the transmission antennas.
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| Method for generating two-dimensional orthogonal variable spreading code and mimo system using the same | 20060171294 | 20060803 |
| Provided are a method for generating a two-dimensional orthogonal variable spreading code and a Multiple Input Multiple Output (MIMO) system using the same. The MIMO system can increase a communication capacity in an asynchronous multiple user system as well as a synchronous system in a wideband-Code Division Multiple Access (CDMA). The MIMO system includes: a transmitting block for temporally and spatially encoding a plurality of user data, spreading the user data into orthogonal channel signals, and transmitting them to antennas; and a receiving block for receiving the orthogonal channel signals and performing temporal and spatial decoding and despreading on them. Herein, the transmitting block includes: a space time code (STC) encoding unit for generating and outputting a predetermined number of STC streams; and a jacket orthogonal... |
| Initiation of a mimo communication | 20060171482 | 20060803 |
| The present invention provides a method and apparatus for initiating a multiple input multiple output (MIMO) communication. The method and apparatus includes processing that begins by transmitting a frame formatted in accordance with a default MIMO active transmitter-receiver antenna configuration to a target receiver. The processing continues by receiving at least one response frame from the target receiver. The processing continues by determining a number of receiver antennas of the target receiver from the at least one response frame.
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| Method and system for rate selection algorithm to maximize throughput in closed loop multiple input multiple output (mimo) wireless local area network (wlan) system | 20060159120 | 20060720 |
| Aspects of a method and system for rate selection algorithm to maximize throughput in closed loop multiple input multiple output (MIMO) wireless local area network (WLAN) system are provided and may comprise computing a maximum number of binary bits to be simultaneously transmitted via an RF channel based on signal quality. A modulation technique may be selected based on the computed maximum, communicating feedback information comprising the selected modulation technique. Subsequently transmitted data may be received via an RF channel which is modulated based on the feedback information. Another aspect of the method may comprise receiving feedback information comprising at least one of a selected modulation technique and coding rate via an RF channel, and transmitting subsequent data via said at least one of a plurality... |
| Transceiver device capable of calibration and calibration method used by the same | 20060160534 | 20060720 |
| A transceiver device capable of calibration, and a calibration method used by the transceiver device. The transceiver device includes a reference transceiver, a plurality of remaining transceivers, and a plurality of transmission calibration paths connecting the remaining transceivers to the reference transceiver for transmission calibration of the remaining transceivers. An envelope detector included in the reference transceiver is shared with the remaining transceivers. When implementing a multiple input multiple output (MIMO) transceiver in a single chip, the chip size and manufacturing cost of the MIMO transceiver device can be substantially reduced.
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| Method for transmitting and receiving preamble sequences in an orthogonal frequency division multiplexing communication system using a multiple input multiple output scheme | 20060153282 | 20060713 |
| In an orthogonal frequency division multiplexing (OFDM) communication system using multiple transmit antennas, a first base sequence with a first length is segmented into a first number of second sequences to which different time offsets are applied. Subsequences of a first preamble sequence corresponding to the number of second sequences are generated. A second base sequence with a second length is segmented into a second number of third sequences to which different time offsets are applied. Subsequences of a second preamble sequence corresponding to the number of third sequences are generated. A subsequence is selected from the subsequences of the first preamble sequence and is transmitted through a transmit antenna in a first time interval. A third preset number of subsequences are selected from the subsequences... |
| Adaptive time diversity and spatial diversity for ofdm | 20060104196 | 20060518 |
| An adaptable orthogonal frequency-division multiplexing system (OFDM) that uses a multiple input multiple output (MIMO) to having OFDM signals transmitted either in accordance with time diversity to reducing signal fading or in accordance with spatial diversity to increase the data rate. Sub-carriers are classified for spatial diversity transmission or for time diversity transmission based on the result of a comparison between threshold values and at least one of three criteria. The criteria includes a calculation of a smallest eigen value of a frequency channel response matrix and a smallest element of a diagonal of the matrix and a ratio of the largest and smallest eigen values of the matrix.
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| Method and apparatus for transmitting/receiving signals in multiple input multiple output wireless communication system employing beam forming scheme | 20060104382 | 20060518 |
| Disclosed is a method and an apparatus for transmitting/receiving signals in an multiple input multiple output (MIMO) wireless communication system. The method and apparatus including beam forming of a reference signal while predetermined codes are mapped on a one-to-one basis to each of a plurality of beams available for the transmitter and thereafter transmitting the beam-formed reference signal to a receiver. Also, if information representing an optimum beam, which maximizes reception performance, is received from the receiver, beam forming of data signals is performed by means of a beam corresponding to the information on the optimum beam and the beam-formed data signals are transmitted to the receiver. Therefore, it is possible to apply a beam forming scheme having minimum operation complexity and maximizing reception performance.
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| Data transport in gsm system | 20060092877 | 20060504 |
| A solution for transporting data in a GSM system is provided. According to the solution a network assigns a number of frequency channels to a subscriber terminal, which may then use multiple frequency channels for simultaneous transport of data. If the subscriber terminal is capable of transporting data using multiple input multiple output transmission, this capability could also be used in the transport of data.
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| Simplified decoder for a bit interleaved cofdm-mimo system | 20060092882 | 20060504 |
| Multiple input multiple output (MIMO) systems are candidates for higher data rate wireless communication systems. Currently, for a single input single output (SISO) 1802.11a system can provide a transmission data rate up to 54 Mbps. The present invention is a 2 by 2 Multiple In Multiple Out (MIMO) system having a decoding apparatus that increases the data rate to over 100 Mbps but at a computation cost about the same as for optimal decoding for a SISO system and 1/64 of the optimal decoding for a 2 by 2 MIMO system. At a bit error rate (BER) of 10-4 level, the 2 by 2 MIMO system of the present invention provides double the transmission data rate of the SISO system with approximately the same signal to... |
| Mixed mode preamble for mimo wireless communications | 20060088120 | 20060427 |
| A method for generating a preamble of a frame for a multiple input multiple output (MIMO) wireless communication begins by, for a first transmit antenna of the MIMO communication, generating a legacy preamble portion for the frame in accordance with a legacy wireless communication protocol, wherein the legacy preamble portion includes at least a first training sequence and a second training sequence and generating a current protocol preamble portion for the frame in accordance with a protocol of the MIMO wireless communication. The processing continues, for at least a second antenna of the MIMO communication, by generating a cyclically shifted legacy preamble portion for the frame, wherein the cyclically shifted legacy preamble portion includes at a cyclically shifted first training sequence and a cyclically shifted second... |
| Broadband, ultra wideband and ultra narrowband reconfigurable interoperable systems | 20060072646 | 20060406 |
| Broadband, ultra wideband and ultra narrowband (UWN) reconfigurable, interoperable communication and broadcasting system architectures, combinations and hybrids of ultra wideband (UWB), ultra narrowband (UNB) and efficient broadband wireless, baseband, intermediate frequency (IF) and radio frequency (RF) implementations for Bit Rate Agile (BRA) reconfigurable and interoperable systems, Adaptive Modulation and Coding (AMC). Processing the data signals, of clock signals, and/or carrier cycles waveforms leads to shaped radio-frequency (RF) cycles, waveforms and wavelets. With Multiple Input Multiple Output (MIMO) diversity and protection system configuration the performance and capacity of these systems may be further enhanced.
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| Hybrid communication and broadcast systems | 20060072647 | 20060406 |
| Hybrid communication ad broadcast systems for broadband, ultra wideband and ultra Narrowband (UWN) reconfigurable, interoperable communication and broadcasting system architectures. Combinations and hybrids of ultra wideband (UWB), ultra narrowband (UNB) and efficient broadband wireless, baseband, intermediate frequency (IF) and radio frequency (RF) implementations for Bit Rate Agile (BRA) reconfigurable and interoperable systems Processing the data signals, of clock signals, and/or carrier cycles waveforms leads to shaped radio-frequency (RF) cycles, waveforms and wavelets. With Multiple Input Multiple Output (MIMO) diversity and protection system configuration the performance of these systems may is further enhanced.
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