Skyworks Solutions, Inc.

Conexant Systems, Inc.

Mediatek Corporation

Rockwell International Corporation

Mediatek Singapore Pte. Ltd.

Ganning Yang

John S Walley

Yongbing Wan

Kenneth Scott Walley

Chiaming Lo

Yi Weng

Steven A Gronemeyer

Kenneth David Ko

Jamal Haque

P Michael Henderson

Joel D Peshkin

Raphael Rahamim

Edward S Zuranski

Shrenik P Patravali

Anthony A Tzouris

Frederic M Stubbe

David O Anderton

Ismail I Eldumiati

Weizhuang Xin

Don L Harmer

Kenneth E Garey

Terence Yim

Timothy Perrin Fisher-Jeffes

Jonathan Richard Strange

Virginia M Chan

Yangjian Chen

Jianxuan Du

Wei-Jen Chen

Yabo Li

Ming-Chi Chen

Songsong Sun

Stephen C Muller

Wei-Yu Lai

Hengsheng Tang

YenHui Yeh

Wireless receiver systems and methods for user equipment are described that employ multiple receiver heads. The multiple heads can receive wireless communication signals over different receive paths from different transmission sources. The systems can scan and monitor signal quality from all receiver heads during a scheduled gap in a communication link without interfering with an ongoing communication session.

Receiver architecture for new radio systems

A channel estimation method estimates a data channel of a data resource element of a physical resource block in a time-frequency domain. The method includes: utilizing a detection circuit to perform a first physical resource block bundling detection in a first direction of the time-frequency domain to detect if at least one neighboring physical resource block is allowed to be bundled with the physical resource block, and accordingly generating a first physical resource block bundling detection result; determining a physical resource block processing range according to at least the first physical resource block bundling detection result, wherein at least the physical resource block is included in the physical resource block processing range; obtaining a plurality of pilot channels for pilot resource elements in the physical resource block processing range; and estimating the data channel of the data resource element according to the pilot channels.

Channel estimation method and associated device for estimating data channel of data resource element of physical resource block for OFDM system

A method includes, during a first iteration of a first decoder for decoding convolutionally encoded data elements, determining a first value of a first path metric. The method also includes, during a second iteration of the first decoder, determining a second value of the first path metric by using the first value of the first path metric as an initial value of the first path metric.

Initializing decoding metrics

A system and method is provided for improved and efficient decoding of a received data sequence. The invention can perform the decoding using a LogMap function for a set of N inputs, where N is greater than 2.

System and method for decoding a received data sequence

A method for clock calibration is provided. The method comprises receiving discontinuous reception period (DRX period) information from a base station, computing a calibration duration according to the discontinuous reception period and a clock error tolerance of a first clock, and when receiving paging information that informs of possible sent transmissions, calibrating the first clock with a second clock for a period of the calibration duration.

Method for clock calibration

A receiver of a CDMA system, receiving a signal transmitted through a multi-path channel, with a path alignment circuit is disclosed. The path alignment circuit has a pack-based memory device serially inputting samples of low over-sampling rate than that required by the CDMA system and outputting data packs pack by pack to reduce access rate of the memory device. In addition, the path alignment circuit has an interpolation device which reads the data packs from the memory device and performs interpolation to raise the resolution of the low over-sampling samples and generate interpolated samples of high resolution for de-spreading requirement of the CDMA system.

Receiver of a CDMA system with a path alignment circuit

A system and method is provided for improved and efficient forward and backward recursive computations that may be used, for example, with turbo code decoding applications. The invention performs the forward computations using a full length of a sequence to be decoded and performs the reverse computations using a sliding window over the sequence.

System and method for forward and backward recursive computation

A detector for detecting a received signal according to a Gaussian shift keying ('GFSK/GMSK') modulation scheme. The detector may enhance a detection performance of the receiver while limiting one or more implementation impacts. An implementation impact may include an implementation complexity impact, an implementation cost impact, or other impacts. The detection performance of the detector may be enhanced in relation to one or more performance aspects, such as, an ISI aspect, an AWGN aspect, a co-channel interference aspect, a sensitivity aspect, an error propagation aspect, or other aspects. The detector may be configured or reconfigured to enhance one or more particular performance aspects. The enhancement of the particular performance aspects may affect, adversely or otherwise, one or more related performance aspects that may be related to the particular performance aspects. The detector may be configured or reconfigured according to a current application of the detector.

GFSK/GMSK detector with enhanced performance in co-channel interference and AWGN channels

A multiple stage matched filter for a wireless receiver comprises a receiver configured to develop a received signal, the received signal comprising a bit stream of signal samples, and a multiple stage matched filter configured to parallel process the received signal such that multiple codes are analyzed simultaneously to determine a frequency offset and code location.

Multiple simultaneous frequency and code acquisition for a code division multiple access (CDMA) communication system

A channel estimation system is disclosed. The channel estimation system comprises a first memory element having a write function and a plurality of read functions, a pilot signal extraction element adapted to receive a first output of the first memory element, a programmable averaging element adapted to receive the output of the pilot signal extraction element, and a combiner adapted to receive a second output of the memory element and the output of the programmable averaging element, wherein the second output of the first memory element is delayed with respect to the first output of the first memory element.

Channel estimation system for a wideband code division multiple access (WCDMA) communication system

A digital subscriber line (DSL) communication system that utilizes the high frequency band of a standard telephone line does not require the use of a plain old telephone service (POTS) splitter in the resident's home, which provided isolation between the POTS frequency band (0 to 4 kHz) and the DSL frequency band. A digital subscriber line modem utilizes either constant envelope modulation or quadrature amplitude modulation for outputting DSL signals upstream to a central office. When a telephone in the resident's home is detected as being off-hook, then the constant envelope modulation is used by the DSL modem in order to lessen the intermodulation product distortion that results in audible noise heard by a user of the telephone. When the telephone is on-hook, then another type of modulation, such as QAM, is used to maximize the upstream data rate capability in the DSL frequency band, since any noise generated by the QAM is not a problem due to the non-use of the POTS frequency band.

Modulation switching for DSL signal transmission

A system for detecting a burst in a wireless communications system. A signal strength indicator indicates the strength of an incoming signal representative of incoming packets. A signal strength change detector detects changes in the signal strength of the incoming signal. Signal strength detection logic determines if a change in signal strength of a predetermined magnitude has occurred. A pattern detector detects patterns of symbols, or symbol estimates, in the incoming signal to determine if a predetermined pattern of symbols is present. Burst detection logic signals detection of a burst if the signal strength detection logic determines that a change in signal strength of predetermined magnitude has occurred, and the pattern detector determines that a predetermined pattern of symbols is present.

Burst detector

A digital phase/frequency detector capable of being implemented with on-chip components and configured to detect signals having small modulation indices. Transition points within the signal are detected and the width between successive transition points measured and averaged. The average width measurements may be converted to width deviation values by subtracting out the width due to the carrier frequency. An interpolation may be performed between the current and previous values of the width deviation values to reduce quantization error. The interpolated values may be converted to frequency deviation values, and a predetermined number of the frequency deviation values may be averaged. The average frequency deviation values may then be equalized in order to reduce intersymbol interference. The resulting equalized values form soft estimates of the underlying source bits. Hard estimates of the source bits may then be derived from the soft estimates.

Digital phase/frequency detector

A system is provided for controlling amplification in a receiver. The receiver amplifies a signal in accordance with a controlled gain to enhance the reliability of demodulating the received signal. A lower frequency signal is derived by down-converting the received signal. The derived lower frequency signal is converted into a digital baseband signal. A compensatory direct current offset is determined by evaluation of one of trailing symbols and a defined sequence of a data packet of the received signal. A compensatory direct current offset is manipulated with respect to a digital baseband signal to compensate for an unwanted direct current offset of the digital baseband signal, indicative of a frequency difference between the received signal and the transmitted signal.

Amplification control scheme for a receiver

A demodulation system capable of configuring itself responsive to channel conditions. A plurality of detectors may be provided, one or more of which may be better able to handle a particular form of interference than one or more of the other detectors. The detectors estimate source bits from a common signal. One or more signal quality estimators receive the estimated bits for the detectors, and provide performance metrics for each of the detectors. A selector selects or continues the pre-selection of one of the detectors responsive to the performance metrics. A multiplexor outputs the estimated bits from the selected or pre-selected detector.

Growing community of inventors

Irvine, CA, United States of America

Ganning Yang