Cdma System

Cdma System-related patent applications - as published by the U.S. Patent and Trademark Office (USPTO).

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Communication device for performing carrier search in td-scdma system and method of controlling same
April 06, 2017 - N°20170099116

A communication device and method operating in a wireless communication system is provided. The communication device includes a memory configured to store frequency history information; and a processor electrically connected to the memory, wherein the processor is configured to measure reception power of each of a plurality of first signals included in a first band, determine a first candidate frequency ...
Subscriber-controlled registration technique in a cdma system
Ipr Licensing, Inc.
December 15, 2016 - N°20160366609

A method and apparatus for dynamic uplink communication in a wireless communication system are disclosed herein. The method includes receiving, by the mobile station, a first channel from a first base station, wherein the first channel includes an indication, wherein the indication has one of two states, wherein the base station transmits on forward link channels including a pilot channel, ...
Method and device for processing inter-system reselection or switch
Datang Mobile Communications Equipment Co., Ltd
September 29, 2016 - N°20160286440

The present invention discloses a processing method and device for reselecting or switching ue from a td-scdma system to a td-lte system. The method includes: receiving, by a pgw, a modify bearer request message sent by an sgw; obtaining, by the pgw, an s5/s8 interface resource in current bearer context information, updating the bearer context information according to the ...
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Control signal aggregation in a multi-carrier wcdma system
Telefonaktiebolaget L M Ericsson (publ)
March 24, 2016 - N°20160088603

Methods and apparatus are disclosed for transmitting data to a remote node via each of two or more transmitted carrier signals, wherein a distinct outbound packet data traffic channel is mapped to each transmitted carrier signal. In an exemplary method, aggregated control channel data is formed by combining control channel data corresponding to each of two or more received carrier ...
Interference suppression for cdma systems
Iii Holdings 1, Llc
November 05, 2015 - N°20150318883

Interference is cancelled from a baseband signal by synthesizing interference from estimated symbols in interfering subchannels. The estimated symbols are hard-coded, soft weighted, or zeroed, depending on the value of an estimated pre-processed signal-to-interference-and-noise ratio (sinr) in each subchannel in order to maximize a postprocessed sinr. The estimated pre-processed sinr is obtained from averages of estimated symbol energies and estimated ...
Multi-tiered detection of a geofence
Apple Inc.
October 01, 2015 - N°20150281893

Methods, program products, and systems for multi-tier detection of a geofence are disclosed. In general, in one aspect, a mobile device can be configured to perform a task when the mobile device enters a geographic region. The mobile device can monitor a current location using a multi-tiered approach. A baseband subsystem can monitor a coarse location of the mobile device ...
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Maximizing data rate by adjusting codes and code rates
Intel Corporation
August 06, 2015 - N°20150222392

The present invention provides for making code rate adjustments and modulation type adjustments in a pseudonoise (pn) encoded cdma system. Coding rate adjustments may be made by changing the number of information bits per symbol, or forward error code (fec) coding rate. A forward error correction (fec) block size is maintained at a constant amount. Therefore, as the number of ...
Discontinuous transmission cdma system
Core Wireless Licensing S.a.r.l.
May 21, 2015 - N°20150139216

A method of transmitting in a second mode at least one data frame from a first node to a second node. Determining if there is data to be transmitted and if there is no data to be transmitted then transmitting from said first node to said second node no frame in the second mode. The first node receiving an indication ...
Random access channel preamble
Interdigital Technology Corporation
April 16, 2015 - N°20150103808

One out of sixteen preamble signatures is selected. A code is produced based on the selected preamble signature. The produced code is phase rotated to produce a processed preamble signature signal. The processed preamble signature signal is used in processing the cdma rach signal and the cdma rach signal is used to access a cdma system.
Power estimation for wireless communication devices in code division multiple access systems technical field
Telefonaktiebolaget L M Ericsson (publ)
April 02, 2015 - N°20150092896

A wireless communication device for a cdma system is configured to generate power estimates with reduced estimation bias. The power estimates may be used for delay estimation, mmse channel estimation, demodulation, or other purposes. The wireless communication device produces first set of power estimates for a first set of delays and generates a model of the signal powers at the ...
Methods for estimation and interference suppression for signal processing
Iii Holdings 1, Llc
January 15, 2015 - N°20150016297

A receiver in a cdma system comprises a front end processor that generates a combined signal per source. A symbol estimator processes the combined signal to produce symbol estimates. An s-matrix generation module refines these symbol estimates based on the sub channel symbol estimates. An interference canceller is configured for cancelling interference from at least one of the plurality of ...
Method for balancing the ratio eb/i in a service multiplexing cdma system and telecommunication ...
Mitsubishi Electric Corporation
December 25, 2014 - N°20140376572

A communication apparatus for communicating data conveyed by a plurality of transport channels, the data of the transport channels being multiplexed into at least one multiplexing frame, includes a processing unit. The processing unit transforms an input data block of an initial size into an output data block of a final size in accordance with a rate matching ratio of ...
Method and apparatus for automatic gain control for td-scdma systems
Mitsubishi Electric Corporation
December 04, 2014 - N°20140355572

A method and apparatus in wireless communications is provided. The method may include measuring received powers levels for a first window of samples, and computing a gain value based on the measured received powers levels. The method may also include determining an offset duration such that the first window of samples and a second window of samples both are included ...
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Methods and apparatus for special burst transmissions to reduce uplink and downlink interference for td-scdma ...
Mitsubishi Electric Corporation
September 04, 2014 - N°20140247814

A method and apparatus in wireless communications is provided. The method may include determining an occurrence of a special burst time slot, and obtaining one or more control symbols located in a first data field and a second data field of the special burst time slot.
Channel estimation method, channel estimation apparatus and communication device for cdma systems
Mitsubishi Electric Corporation
August 14, 2014 - N°20140226600

The embodiment of the invention discloses a channel estimation method for a td-scdma system. The channel estimation method comprises steps of: obtaining a coarse channel estimation of a channel 1 of an intra-frequency cell set by a single cell channel estimation algorithm; performing an interference cancellation on the coarse channel estimation to obtain a channel estimation; determining a channel environment according ...
User equipment in a congestion controlled cdma system
Mitsubishi Electric Corporation
June 05, 2014 - N°20140153395

A system for controlling congestion in a code division multiple access system with multi-user detection capabilities is disclosed. The system includes at least one user equipment, a base station, and a radio network controller. Each user equipment includes a receiver having multi-user detection capabilities. The base station includes a receiver having multi-user detection capabilities, an intra-cell interference measuring device, and ...
Multi-tiered detection of a geofence
Mitsubishi Electric Corporation
May 22, 2014 - N°20140141802

Methods, program products, and systems for multi-tier detection of a geofence are disclosed. In general, in one aspect, a mobile device can be configured to perform a task when the mobile device enters a geographic region. The mobile device can monitor a current location using a multi-tiered approach. A baseband subsystem can monitor a coarse location of the mobile device ...
Signal equalization with compensation for scrambling code correlation
Mitsubishi Electric Corporation
May 15, 2014 - N°20140133542

A method for equalizing a received radio signal in a wcdma system, comprises receiving (210), in a radio receiver, of a digital radio signal spread by scrambling codes. A channel estimation is performed (230) on the received digital radio signal for a plurality of channels. The received digital radio signal is in an equalizer equalized (240) into an equalized digital radio signal. This ...
Channel estimation method for td-scdma
Mitsubishi Electric Corporation
April 24, 2014 - N°20140112165

A channel estimation method for td-scdma system includes: sending midamble data to channel estimator and estimating the serving cell and adjacent cell channel response; calculating the interference cell number and setting the iteration number for interference cancelation; providing a channel response to a channel noise-suppression module that outputs a suppressed channel response; applying adaptive iterative interference cancelation. The invention solves ...
Subscriber-controlled registration technique in a cdma system
Mitsubishi Electric Corporation
March 06, 2014 - N°20140064075

A method and apparatus for dynamic uplink communication in a wireless communication system are disclosed herein. The method includes transmitting, by a base station, a pilot signal on a first channel to a mobile station (ms), the pilot signal indicating a signal strength, receiving, by the ms, a one-bit indicator from a plurality of base stations on a second channel, ...
Methods for estimation and interference suppression for signal processing
Mitsubishi Electric Corporation
January 02, 2014 - N°20140003471

A receiver in a cdma system comprises a front end processor that generates a combined signal per source. A symbol estimator processes the combined signal to produce symbol estimates. An s-matrix generation module refines these symbol estimates based on the sub channel symbol estimates. An interference canceller is configured for cancelling interference from at least one of the plurality of ...