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Frequency Division Multiple Access patents



      
           
This page is updated frequently with new Frequency Division Multiple Access-related patents. Subscribe to the Frequency Division Multiple Access RSS feed to automatically get the update: related Frequency RSS feeds.

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Date/App# patent app List of recent Frequency Division Multiple Access-related patents
04/17/14
20140106686
 Methods and systems for high capacity wireless broadband delivery patent thumbnailMethods and systems for high capacity wireless broadband delivery
System enhancement(s) are disclosed that can add capabilities, such as, using frequency division multiple access (fdma) and/or time division multiple access (tdma) and/or frequency division duplex (fdd) capabilities along with multi-input multi-output (mimo) antennas and/or global positioning system (gps) synchronization. The use of two radios in both the base-station and the subscriber-station, i.e., customer premises equipment (cpe), e.g., can allow frequency division to be utilized, exploiting higher receive gains at the cpe while not affecting transmissions occurring on the other radio's frequency..
04/17/14
20140105040
 Method and apparatus for uplink power control in an orthogonal frequency division multiple access communication system patent thumbnailMethod and apparatus for uplink power control in an orthogonal frequency division multiple access communication system
A communication system minimizes inter-cell interference and handover holes by providing for a user equipment (ue) to monitor downlink signals from a serving, boundary enodeb and one or more neighbor enodebs, determine a signal quality metric (sqm) for each monitored signal to produce an sqm associated with each enodeb, and determine a maximum uplink transmit power level (pmax) for each enodeb. Based on the determined sqms and pmaxs, the ue determines a enodeb of the one or more neighbor enodebs with a best sqm and, in response to determining that the neighbor enodeb of the one or more neighbor enodebs with a best sqm is a high power enodeb, determines a difference between the sqm associated with the high power enodeb and the sqm associated with the boundary enodeb.
03/27/14
20140086172
 Apparatus and method for feeding back channel quality information and scheduling apparatus and method using the same in a wireless communication system patent thumbnailApparatus and method for feeding back channel quality information and scheduling apparatus and method using the same in a wireless communication system
An apparatus and method are provided for feeding back channel quality information and performing scheduling using the fed-back channel quality information in a wireless communication system based on orthogonal frequency division multiple access (ofdma). In the ofdma wireless communication system, forward performance degradation due to a decrease in an amount of reverse channel quality information is reduced, and also an increase in the reverse load due to channel quality information feedback is suppressed.
03/27/14
20140086171
 Apparatus and method for feeding back channel quality information and scheduling apparatus and method using the same in a wireless communication system patent thumbnailApparatus and method for feeding back channel quality information and scheduling apparatus and method using the same in a wireless communication system
An apparatus and method are provided for feeding back channel quality information and performing scheduling using the fed-back channel quality information in a wireless communication system based on orthogonal frequency division multiple access (ofdma). In the ofdma wireless communication system, forward performance degradation due to a decrease in an amount of reverse channel quality information is reduced, and also an increase in the reverse load due to channel quality information feedback is suppressed.
03/20/14
20140079399
 Time to time-frequency mapping and demapping for ethernet passive optical network over coax (epoc) patent thumbnailTime to time-frequency mapping and demapping for ethernet passive optical network over coax (epoc)
Embodiments include, but are not limited to, systems and methods for enabling orthogonal frequency division multiple access (ofdma) in the upstream in an ethernet passive optical network over coax (epoc) network. Embodiments include systems and methods for translating ethernet passive optical network (epon) upstream time grants to ofdma resources represented by individual subcarriers of an upstream ofdma frame.
03/20/14
20140079149
 Feedback method and apparatus for use in mobile communication system patent thumbnailFeedback method and apparatus for use in mobile communication system
A method and system are provided for a terminal to measure channel quality and transmit channel state information to a base station in a wireless mobile communication system operating in a multi-carrier-based multiple access scheme such as orthogonal frequency division multiple access (ofdma). The feedback information transmission method of a terminal in a mobile communication system includes receiving configuration information corresponding to at least two reference signals from a base station, receiving, at the terminal, feedback configuration information for measuring the at least two reference signals and generating feedback information based on a measurement result, receiving, at the terminal, the at least two reference signals, and transmitting, by the terminal, the feedback information at timings indicated in the feedback configuration information..
03/20/14
20140079103
 Interference cancellation within ofdm communications patent thumbnailInterference cancellation within ofdm communications
Many communication systems operate based on orthogonal frequency division multiplexing (ofdm) signaling and/or orthogonal frequency division multiple access (ofdma) signaling. Within such systems, narrowband interference, which may alternatively be referred to as narrowband ingress, narrowband ingress interference, narrowband noise, etc., may adversely affect one or more subcarriers or tones causing a reduction in performance or even link failure.
03/20/14
20140078922
 Interference detection patent thumbnailInterference detection
Measures for enabling accurate and prompt inter-cell interference detection in a multi-cell environment. Such measures may include, at a network side of a cellular system, inputting a code-spreaded interleaved frequency division multiple access signal, despreading the inputted signal using a plurality of user-specific spreading codes including at least one spreading code of a user of a subject cell and at least one spreading code of a user of a neighboring cell, and detecting inter-cell interference information on the basis of user-related despreaded signals..
03/06/14
20140064239
 Method and apparatus for generating pilot tone in orthogonal frequency division multiplexing access system, and method and apparatus for estimating channel using it patent thumbnailMethod and apparatus for generating pilot tone in orthogonal frequency division multiplexing access system, and method and apparatus for estimating channel using it
The present invention relates to a pilot tone generating method and apparatus of an orthogonal frequency division multiple access system and method, and a channel estimation method and apparatus using the same. The channel estimation apparatus includes a pilot tone extracting unit for extracting a pilot tone, which is inserted within a frame with data tone, masked with an orthogonal code; a pilot tone unmasking unit for unmasking of the pilot tone extracted from the pilot tone extracting unit by using an orthogonal code information; and a channel estimation operating unit for estimating a channel by calculating an average of the pilot tones which is unmasked in the unmasking unit..
02/20/14
20140050207
 Combined simulcasting and dedicated services in a wireless communication system patent thumbnailCombined simulcasting and dedicated services in a wireless communication system
An efficient method for providing both dedicated and simulcast services over a common wireless infrastructure is described. The services can be available to a single terminal as well as to a multiplicity of terminals simultaneously.
02/06/14
20140036655
Mimo beamforming-based single carrier frequency division multiple access system
A multiple-input multiple-output (mimo) beamforming-based single carrier frequency division multiple access (sc-fdma) system is disclosed. At the transmitter, a fast fourier transform (fft) is performed on transmission data to generate frequency domain data.
01/16/14
20140016606
Transmission of advanced-map information elements in mobile networks
An apparatus that transmits advanced-map (a-map) information in a mobile communication network determines whether or not to split an information element to two or more parts that will be transmitted in two or more logical resource units. Each part of information element in a logical resource unit includes an indicator to indicate that a second part exists in another subsequent logical resource unit.
12/26/13
20130343359
Method and apparatus for transmitting srs in lte tdd system
A method and apparatus are provided for transmitting an uplink sounding reference signal (srs) by a user equipment (ue). The method includes receiving information related to an srs period and an offset for an srs transmission; generating the uplink srs; and when the information indicates the srs period is 2 ms, transmitting the srs in two single carrier frequency division multiple access (scfdma) symbols in a half frame according to the offset for the srs transmission.
12/19/13
20130336226
Method and device for transmitting data in wireless communication system
Provided are a method and a device for transmitting wireless communication data. A terminal transmits a channel quality indicator (cqi) to a base station through a physical uplink control channel (pucch) which is allocated within a sounding reference signal (srs) subframe that is determined in a ue-specific manner, and transmits uplink (ul) data through a physical uplink shared channel (pusch) which is allocated within said srs subframe.
12/05/13
20130322386
Method and apparatus for accessing an uplink random access channel in a single carrier frequency division multiple access system
A method and apparatus for accessing a contention-based uplink random access channel (rach) in a single carrier frequency division multiple access (sc-fdma) system are disclosed. A wireless transmit/receive unit (wtru) randomly selects a rach subchannel and a signature among a plurality of available rach subchannels and signatures.
11/28/13
20130315049
Noise power estimation method
A method for estimating noise power in a received signal that was transmitted using an orthogonal frequency division multiple access (ofdma) modulation scheme in which pilot symbols are transmitted during ofdm symbol periods of the transmitted signal, the method comprising: interleaving a de-patterned pilot symbol that was transmitted in an ofdm symbol period of the transmitted signal with a de-patterned pilot symbol that was transmitted in a previous ofdm symbol period of the transmitted signal to generate an interleaved de-patterned pilot symbol; filtering the de-patterned interleaved pilot symbol to remove a signal component of the interleaved pilot symbol to leave a noise component of the interleaved de-patterned pilot symbol; and processing the noise component generated by the filtering to generate an estimate of the noise power in the interleaved de-patterned pilot symbol.. .
11/21/13
20130308657
Method and apparatus for transmitting/receiving multiple codewords in sc-fdma system
The present invention relates a method and apparatus for transmitting/receiving data using multiple codewords in a communication system using sc-fdma (single carrier frequency division multiple access). A transmitter generates the multiple codewords for user data and transmits the generated multiple codewords.
10/24/13
20130279454
Method and apparatus of transmitting scheduling request in wireless communication system
A method and an apparatus of transmitting scheduling request (sr) in a wireless communication system are provided. The method includes configuring a physical uplink control channel (pucch) for a sr in a subframe, the subframe comprising a plurality of single carrier-frequency division multiple access (sc-fdma) symbols, wherein one sc-fdma symbol on the pucch is punctured and transmitting the sr on the pucch in the subframe..
09/26/13
20130251055
Apparatus and method for controlling distortion signal and system by using the same
Disclosed are a signal distortion component adjusting apparatus and method capable of adjusting error vector magnitude of subcarriers of a predetermined position by adjusting a signal distortion component occurring while decreasing a peak to average power ratio (papr) in a communication system of an orthogonal frequency division multiplexing (ofdm) technology or an orthogonal frequency division multiple access (ofdma) scheme, and a system using the same. The present invention includes a signal distortion component adjusting unit to add an additional signal distortion component pe((n+n/2) % n) to a signal distortion component e(n) that is obtained by subtracting a threshold th value, set to decrease peak power, from an absolute value of a time domain signal x(n) of an input signal, and to thereby adjust the signal distortion component.
09/26/13
20130250922
Apparatus and method for transmitting and receiving a rach signal in sc-fdma system
Embodiments of the present invention may provide an apparatus and a method for transmitting and receiving a random access channel (rach) in a single carrier-frequency division multiple access (sc-fdma) system. A frequency domain rach signal may be mapped to a localized sub-frequency band of an entire frequency band available to the sc-fdma system.
09/26/13
20130250921
Apparatus and method for transmitting and receiving a rach signal in sc-fdma system
Embodiments of the present invention may provide an apparatus and a method for transmitting and receiving a random access channel (rach) in a single carrier-frequency division multiple access (sc-fdma) system. A frequency domain rach signal may be mapped to a localized sub-frequency band of an entire frequency band available to the sc-fdma system.
09/19/13
20130242926
Methods and systems for conveying scheduling information of overlapping co-scheduled users in an ofdma-mu-mimo system
A method implemented in a base station for conveying scheduling information in an orthogonal frequency division multiple access (ofdma) multi-user (mu)-multiple input multiple output (mimo) system is disclosed. The method includes transmitting to a first user equipment (ue) the scheduling information including first scheduling information of the first ue and at least a portion of second scheduling information of at least one second ue, wherein the scheduling information includes a resource block (rb) assigned to the first ue, the number of streams, and an indication of one or more dedicated reference symbol (rs) layers assigned to the first ue.
08/29/13
20130223389
Method and apparatus for sequence hopping in single carrier frequency division multiple access (sc-fdma) communication systems
Methods and apparatus are provided for transmitting a reference-signal and a data signal by a user equipment in a communication system. The data signal is generated.
08/22/13
20130216229
Orthogonal frequency division multiple access time division multiple access-passive optical networks ofdma tdma pon architecture for 4g and beyond mobile backhaul
Systems and methods are provided for network communication using wireless base stations and an optical orthogonal frequency division multiple access (ofdma) signal generated on an optical wavelength, with the optical ofdma signal being composed of a plurality of ofdma subcarriers. A multi-level modulator modulates each of the plurality of ofdma subcarriers.
08/08/13
20130201814
Methods and apparatus for signal conditioning in ofdma systems
Methods and systems for conditioning an orthogonal frequency division multiplex (ofdm) signal are disclosed. The ofdm signal may be conditioned prior to transmission by a transmitter in an orthogonal frequency division multiple access (ofdma) system operating on a channel with a plurality of subcarriers grouped into subchannels.
08/01/13
20130195062
Multi-carrier communications with adaptive cluster configuration and switching
A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (ofdma) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber..
08/01/13
20130195061
Multi-carrier communications with adaptive cluster configuration and switching
A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (ofdma) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber..
08/01/13
20130195002
Cyclic prefix in evolved multimedia broadcast multicast service with high transmit power
A method, an apparatus, and a computer program product for wireless communication are provided in which a cyclic prefix duration for orthogonal frequency division multiple access symbols is determined. The cyclic prefix duration is calculated to reduce inter-symbol interference associated with a transmitter located at a distance that is more than 5 kilometers from one or more user equipment.
07/18/13
20130182692
Method and user equipment for transmitting feedback information
A method for transmitting feedback information and a user equipment are disclosed in the present document, wherein, one method includes: a user equipment (ue) performing time domain extension on feedback information within one subframe; and mapping respectively data which go through the time domain extension and demodulation reference signals corresponding to the data which go through the time domain extension to multiple uplink single carrier-frequency division multiple access (sc-fdma) symbols within the subframe, and transmitting the data which go through the time domain extension and the demodulation reference signals corresponding to the data which go through the time domain extension in the same frequency domain position in a way of time division multiplexing; wherein, each uplink sc-fdma symbol occupies n successive physical resource blocks in the frequency domain, and n is a positive integer.. .
07/04/13
20130170837
Converged pon for tdma-pon service based on ofdma-pon
A converged passive optical network (cpon) and a data transmission method are disclosed. The cpon is a combination of a time division multiple access-passive optical network (tdma-pon) and an orthogonal frequency division multiple access-passive optical network (ofdma-pon) and is able to dynamically controlling a bandwidth for upstream signal transmission through allocation of multiple subcarriers to each single optical network unit (onu)..
07/04/13
20130170409
Apparatus and method for transceiving a signal using a predetermined frame structure in a wireless communication system
Disclosed are an apparatus and method for transceiving a signal using a frame structure appropriate for a high-speed moving body. The method for transceiving a signal using a predetermined frame structure according to the present invention comprises a step of transceiving a signal via a frame having the predetermined frame structure, wherein one frame is constituted by eight subframes, and said frame consists of a type-1 subframe consisting of six orthogonal frequency division multiple access (ofdma) symbols and a type-2 subframe consisting of seven ofdma symbols, and said frame has a cyclic prefix length which is either 0, 1/32 of the useful symbol length, 1/64 of the useful symbol length, or 1/128 of the useful symbol length..
06/27/13
20130163537
Method implemented in a user equipment
In some implementations, a method implemented in a user equipment ue for single carrier frequency division multiple access sc-fdma within a wireless system includes receiving an assignment of a plurality of uplink scheduling request resources and comprising a plurality of sc-fdma subcarriers of the wireless system. One of the plurality of uplink scheduling request resources is selected for transmission of scheduling requests.
06/27/13
20130163536
Method implemented in an enodeb
In some implementations, a method implemented in an enodeb (enb) base station for single carrier frequency division multiple access sc-fdma within a wireless system includes assigning to a user equipment a plurality of uplink scheduling request resources each comprising a plurality of subcarriers. It is determined that change in scheduling request resource used by the ue should be made.
06/27/13
20130163535
Method implemented in a user equipment
In some implementations, a method implemented in user equipment ue for use in a wireless system for single carrier frequency division multiple access sc-fdma includes receiving an assignment of a recurring scheduling request resource from within the wireless system. Information is transmitted on an instance of the assigned recurring scheduling request resource within an sc-fdma uplink shared channel signal wherein said information comprises a user id..
06/27/13
20130163534
Method implemented in a user equipment ue for use in a wireless system
In some implementations, a method implemented in a user equipment ue for use in a wireless system for single carrier frequency division multiple access sc-fdma, the method including receiving an assignment of a scheduling request resource in the wireless system comprising a plurality of subcarriers. A user id is encoded.
06/27/13
20130163533
Method implemented in an enodeb base station
In some implementations, a method implemented in an enodeb base station (enb) for a single carrier frequency division multiple access sc-fdma within a wireless system includes receiving information within an sc-fdma uplink shared channel signal on a recurring scheduling request resource. The received information comprises a user id.
06/27/13
20130163532
Method implemented in an enodeb base station
In some implementations, a method implemented in an enodeb base station (enb) for a single carrier frequency division multiple access sc-fdma wireless system includes receiving an uplink control channel signal on an assigned scheduling request resource. A user id is decoded from the received uplink control channel signal.
06/27/13
20130163484
Apparatus and method for transmitting/receiving signals by using a preset frame structure in a wireless communication system
The present invention relates to an apparatus and a method for transmitting/receiving signals by using a preset frame structure in a wireless communication system. As there are difficulties ensuring the link capacity and quality for a high speed moving object with the existing frame structure and the antenna arrangement and communication system based on the existing scheme, a new frame structure needs to be proposed.
06/20/13
20130155980
Orthogonal frequency division multiple access with carrier sense
A communication system in which an access point and one or more devices communicating through the access point adaptively apply orthogonal frequency division multiple access (ofdma). The access point may assign orthogonal subcarriers to devices as in conventional ofdma, but the access point senses activity on the subcarriers and selects subcarriers without activity for assignment.
06/13/13
20130148592
Data transmission method and device in wireless communication system
A data transmission method and device are provided in a wireless communication system. A user equipment transmits uplink control information (uci) using a physical uplink control channel (pucch) resource, allocated to a first component carrier (cc) among a plurality of cc's, in a sounding reference signal (srs) subframe.
06/06/13
20130142111
Method for transmitting a signal related to a change in transmission format
Provided is a method of transmitting a signal related to a change in a transmission format. In a wireless communication system which uses an orthogonal frequency division multiplexing (ofdm) symbol or a single carrier-frequency division multiple access (sc-fdma) symbol, the method includes: transmitting, from a base station to a receiver, a radio resource control (rrc) message indicating that a first transmission format is changed to a second transmission format; and if an acknowledgement (ack) message for the rrc message is not received, repetitively transmitting the rrc message, from the base station to the receiver, together with data based on the first transmission format or data based on the second transmission format, wherein the data based on the first transmission format and the data based on the second transmission format transmitted together with the rrc message are alternately selected..
05/30/13
20130136112
Method and apparatus for data and control multiplexing
System(s) and method(s) are provided for transmitting data code symbols and control code symbols spanning disparate transmission time intervals in the uplink. Data and control symbols that overlap in time-domain within a transmission time interval are multiplexed and transmitted employing resources scheduled for data transmission, whereas data and control code symbols that are not multiplexed are transmitted in respective allocated resources.
05/30/13
20130136026
Channel quality information feedback techniques for a wireless system
Channel quality information feedback techniques for a wireless system are described. An apparatus may comprise a base station having base station logic to determine a channel quality indicator feedback dimension value representing a number of resource blocks for an orthogonal frequency division multiple access system to be measured by a subscriber station based on a matching ratio value, and a transceiver to send the channel quality indicator feedback dimension value to the subscriber station.
05/23/13
20130128841
Computed-aided mapping of system information medium access control protocol messages
A method for computer-aided mapping of system information medium access control protocol messages onto a plurality of transport channels for transmission using an orthogonal frequency division multiple access method, wherein a scheduling of system information data packets information in the context of the mapping on a transport channel of the plurality of transport channels is carried out dependent on the type of the system information.. .
05/16/13
20130121290
Method and apparatus of transmitting scheduling request in wireless communication system
A method and an apparatus of transmitting scheduling request (sr) in a wireless communication system are provided. The method includes configuring a physical uplink control channel (pucch) for a sr in a subframe, the subframe comprising a plurality of single carrier-frequency division multiple access (sc-fdma) symbols, wherein one sc-fdma symbol on the pucch is punctured and transmitting the sr on the pucch in the subframe..
05/16/13
20130121200
Multi-carrier communications with adaptive cluster configuration and switching
A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (ofdma) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber..
05/16/13
20130121199
Multi-carrier communications with adaptive cluster configuration and switching
A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (ofdma) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber..
05/09/13
20130114527
Virtual multicarrier design for orthogonal frequency division multiple access communications
Embodiments of the present invention provide a virtual multicarrier design for orthogonal frequency division multiple access communications. Other embodiments may be described and claimed..
05/02/13
20130107857
Pilot scheme for a mimo communication system
The present invention employs a pilot scheme for frequency division multiple access (fdm) communication systems, such as single carrier fdm communication systems. A given transmit time interval will include numerous traffic symbols and two or more short pilot symbols, which are spaced apart from one another by at least one traffic symbol and will have a fourier transform length that is less than the fourier transform length of any given traffic symbol.
04/25/13
20130100995
Hybrid orthogonal frequency division multiple access wtru and method
A hybrid orthogonal frequency division multiple access (ofdma) wireless transmit/receive unit (wtru) and method are disclosed. A wtru includes a transmitter and a receiver.
03/28/13
20130077572
Multiple-antenna system for cellular communication and broadcasting
A reception method and apparatus for use in a multi-cell orthogonal frequency division multiple access (ofdma) wireless system. In a unicast receive mode during a first receive time period, a first group of orthogonal frequency division multiplexing (ofdm) symbols is received by a mobile device from multiple of a plurality of antennas at a serving base station.
03/28/13
20130077467
Receiver in orthogonal frequency division multiple access system and signal processing method thereof
According to an exemplary embodiment of the present invention, a receiver in an orthogonal frequency division multiple access (ofdma) system includes: an extraction unit that extracts received user signal subvectors for subcarriers assigned to the receiver from received signal vectors received from a transmitter; and a fast fourier transform (fft) unit that performs a fast fourier transform on the received user signal subvectors.. .
03/21/13
20130070628
System and method for allocating sub-channels in a network
At least one operating condition is determined for a first mobile subscriber station (104) that is operating in an orthogonal frequency division multiple access (ofdma) network. The first mobile subscriber station (104) is handed off from a base station (102) to a relay station (110).
03/21/13
20130070623
Method and apparatus for allocating a sounding channel in a wireless communication system
There are provided a method and apparatus for allocating a sounding channel in a wireless communication system. A base station transmits a first sounding channel allocation data to allocate a first sounding channel for a first system to a first zone, and transmits a second sounding channel allocation data to allocate a second sounding channel for a second system other than the first system to a second zone.
03/14/13
20130064218
Methods and systems for allocation of macro cell resources in a distributed femto cell network and a distributed relay station network
A method implemented in a wireless network including a first base station and a second base station is disclosed. The method includes, upon a change in a load condition, transmitting from the second base station to the first base station load information through backhaul in order to coordinate the first base station and the second base station, allocating, to the second base station, one or more tiles corresponding to one or more time-frequency resource blocks of orthogonal frequency division multiple access (ofdma), and allocating remaining tiles to the first base station.
03/14/13
20130064188
Dynamic resource management for orthogonal frequency division multiple access wireless networks
The disclosed subject matter relates to dynamic resource management for wireless network components with a wireless communications environment. Personal base stations can be deployed in a substantially uncoordinated manner resulting in conflicts among wireless radio resources.
02/14/13
20130039236
Hierarchical modulation for communication channels in single-carrier frequency division multiple access
System(s) and method(s) are provided to transmit simultaneously a first and a second communication channel in a single-carrier waveform format with disparate error rate requirements. First channel and second channel are coded individually to form an alphabet for a first and second constellation.


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Frequency Division Multiple Access topics: Frequency Division Multiple Access, Communication System, Scheduling, Base Station, Transmitting And Receiving, Frequency Band, Matched Filter, Guard Band, Guard Time, Random Access, Carrier Frequency, Multiplexing, Transmitter, Subscriber, Communications

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