1
Kedar Shirali: Method and apparatus for amplifier linearization using adaptive predistortion. Marvell International, August 1, 2006: US07085330 (47 worldwide citation)

A signal processing method and apparatus capable of correcting signal distortion introduced by an RF power amplifier is disclosed, which includes the use of a buffer to store a plurality of samples representing at least a portion of an input signal intended for amplification by the RF power amplifie ...


2
Kedar Shirali, Hemanth Sampath: Mechanism to improve quality of channel estimates in OFDM transmissions. Marvell International, May 12, 2009: US07532563 (33 worldwide citation)

An OFDM (Orthogonal Frequency Division Multiplexing) system may utilize pilot symbol structures including two or more pilot symbols with pilot information on alternate tones. The pilot information in one symbol is transmitted on mirror tones in another of the symbols. The pilot symbol structure may ...


3
Hongyuan Zhang, Rohit U Nabar, Kedar Shirali, Peter Loc: Calibration correction for implicit beamforming in a wireless MIMO communication system. Marvell World Trade, June 1, 2010: US07729439 (27 worldwide citation)

A transmitter beamforming technique for use in a MIMO wireless communication system determines a partial description of a reverse channel without determining a full dimensional description of the reverse channel. A correction matrix is developed from the partial description of the reverse channel an ...


4
Kedar Shirali, King Chun Tsai, Wayne Loeb: Circuits and methods for adjusting power amplifier predistortion, and power amplifiers and other devices including the same. Marvell International, January 10, 2006: US06985033 (24 worldwide citation)

An amplifier with adjustable (pre)distortion, a predistortion adjustment circuit, systems and networks including such amplifiers and circuits, and methods for adjusting (pre)distortion in an analog amplifier. The amplifier architecture generally includes (a) a predistortion circuit configured to (i) ...


5
Kedar Shirali, Ravi Narasimhan, Yungping Hsu: Adaptively determining a data rate of packetized information transmission over a wireless channel. Marvell International, April 13, 2010: US07697449 (18 worldwide citation)

Systems and techniques relating to processing a signal received over a wireless channel. A technique includes adaptively determining a data rate of packetized information transmission based on both a signal quality measure of a received signal and a channel quality measure derived from the received ...


6
Konstantinos Sarrigeorgidis, Kedar Shirali: Channel tracking in a wireless multiple-input multiple-output (MIMO) communication system. Marvell International, June 12, 2012: US08199841 (12 worldwide citation)

An equalizer to be applied to signals received via at least one multiple input, multiple output (MIMO) channel is computed using a matrix equalizer computational device. The computed equalizer is applied to a received signal to recover an equalized representation of encoded data sent in a transmissi ...


7
Kedar Shirali: Blast MIMO signal processing method and apparatus. Marvell International, April 24, 2007: US07209522 (12 worldwide citation)

A technique for generating a demodulation ordering used in receive signal processing operations in a BLAST MIMO receiver that is based on a relative comparison of near-to-far resistance measures among vectors forming the estimated channel transfer function matrix is disclosed. This near-to-far resis ...


8
Kedar Shirali: Method and apparatus for amplifier linearization using adaptive predistortion. Marvel International, April 22, 2008: US07362821 (11 worldwide citation)

A distortion correction circuit comprises memory that stores N samples of an input signal that occur at N different times, where N is an integer greater than two. A self-receiver samples an output signal that is generated by an RF power amplifier and that is based on said input signal. A synchroniza ...


9
Kedar Shirali, Atul Salhotra, Zhiyu Yang: Clear-channel assessment in 40 MHz wireless receivers. Marvell International, September 25, 2012: US08275323 (9 worldwide citation)

A system including an activity sensing module to sense RF activity in first and second sub-channels of a communication channel of a first wireless network. N adjacent channel interference (ACI) filter modules arranged in parallel receive signals from N antennas, respectively, filter out signals in c ...


10
Hongyuan Zhang, Rohit U Nabar, Kedar Shirali, Peter Loc: Calibration correction for implicit beamforming in a wireless MIMO communication system. Marvell World Trade, July 12, 2011: US07978781 (9 worldwide citation)

A first packet is transmitted via a forward channel corresponding to a signal direction from a first transceiver device to a second transceiver device, wherein the first packet includes a request to initiate calibration. A partial dimensional description of a reverse channel is determined based on t ...