Atmel Corporation

Arraycomm, Inc.

Athos Kasapi

Sriram Sundararajan

Mitchell D Trott

Erik David Lindskog

Adam Bruce Kerr

David M Parish

Serge Barbosa Da Torre

A receiver determines phase and frequency information from data signals that carry information from a transmitter to a receiver, instead of or in addition to, information from control signals. In a specific embodiment, the information is obtained from data signals modulated as a binary phase-shift keying ('BPSK') waveform by demodulation. Other phase-shift keyings might be used instead. Encoded information might be recovered in received OFDM packets by receiving OFDM subcarriers modulated with the two low data rates supported by IEEE 802.11 standard(s) wherein the subcarriers encoding the packet are modulated using binary phase shift keying and the encoding information is at a zero phase or a &#x3c0; (pi) phase offset on each of the subcarriers. Determining the carrier frequency might be done by calculating the square of each of subcarrier signal and/or determining the phase offset of the subcarriers even with information modulated onto the subcarriers.

Channel tracking in an orthogonal frequency-division multiplexing system

The present invention allows a radio receiver or a transmitter, with a plurality of antennas configured into an array, to be calibrated. In one embodiment, the method includes receiving a plurality of signals from a plurality of remote transmitters at the antenna array, sampling the signals received at at least two antennas of the array, computing a relative phase and amplitude of the sampled signals for each antenna, and computing calibration coefficients based on the relative phase and amplitude for the plurality of sampled signals from the plurality of remote transmitters for each antenna.

Statistical calibration of wireless base stations

Growing community of inventors

San Francisco, CA, United States of America

Athos Kasapi