Qualcomm Incorporated

Other

Andrew Corporation

Qualcomm Technologies International, Ltd.

Imagination Technologies Limited

Steven Meade

Adrian John Anderson

Richard Michael Bennett

Matthew Collins

Ondrej Jakubov

Swaroop Venkatesh

Antony James Smithson

Paul George Turner

Paul Damon Murrin

Disclosed are techniques for wireless communication. In an aspect, a receiver wireless device receives, from a transmitter wireless device, a wireless signal comprising a plurality of modulated symbols forming at least one packet, determines a quantification of impairments associated with the plurality of modulated symbols of the wireless signal, the impairments caused by the receiver wireless device, the transmitter wireless device, or both, determines a remembrance factor based on the quantification of the impairments, and demodulates the plurality of modulated symbols of the wireless signal based on a number of previously demodulated symbols, wherein the number of previously demodulated symbols is based on the remembrance factor.

Adapting the performance of the decision feedback demodulator based on quantified impairments

In general, techniques are described for limiters used in wireless transmitters. A transmitter comprising a frontend circuit and a backend circuit may perform various aspects of the limiter techniques. The frontend circuit may obtain a data symbol of a plurality of data symbols representative of data to be transmitted wirelessly, and determine an amplitude and a phase representative of the data symbol. The frontend circuit may also transform the phase to a frequency, compare the frequency to a threshold frequency, and adjust, based on the comparison of the frequency to the threshold frequency, the frequency to obtain an adjusted frequency. The backend circuit configured may obtain, based on the amplitude and the adjusted frequency, a wireless signal, and transmit the wireless signal.

Limiter for trasmitters

Methods and apparatuses of the invention are directed to correcting errors caused by frequency offsets between clocks in a communication system, for example SFO. According to certain aspects, embodiments of the invention provide for resampling data samples corresponding to a received data symbol immediately prior to performing an FFT. According to certain additional aspects, the resampler operates only on the data samples of a cyclic data block, with a known (and minimized) sample timing error to correct.

Method and apparatus for sample frequency offset correction OFDM and single carrier frequency domain equalized receiver systems

Errors present in the output of an amplifier () are compared with the amplifier input in a control unit () to derive corrected coefficients for a look-up table used by predistorter () to eliminate distortion in the output of the amplifier (). Depending on the format of the predistorter (), at least some of the coefficients are corrected using measured errors that have been rendered independent of the input signal's amplitude.

Signal correction techniques

In a remote data acquisition system a control unit transmits a radio signal simultaneously to a plurality of remote units. Each remote unit receives the radio signal at different times dependent on various system delay factors. A compensating delay is added in each remote unit in order to trigger each remote unit for data acquisition at the same time.

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Bristol, United Kingdom

Steven Meade