Patent ID: 8018975

Claim:
A method in an orthogonal frequency division multiplexing (OFDM) receiver, comprising at least one receive antenna, to perform synchronization, the OFDM receiver configured to communicate with a transmitter comprising at least one transmit antenna, the method comprising: at each of the at least one receive antenna, sampling a received signal to produce a respective set of time domain samples; determining at least one coarse synchronization position; at each of the at least one receive antenna: a) for each of a plurality of candidate fine synchronization positions about one of said at least one coarse synchronization position: i) for each receive antenna positioning a fast Fourier transform (FFT) window to the candidate fine synchronization position and converting by FFT the time domain samples into a respective set of frequency domain components; ii) for each said at least one transmit antenna, extracting a respective received training sequence corresponding to the transmit antenna from the sets of frequency domain components; iii) for each transmit antenna, calculating a correlation between each respective received training sequence and a respective known transmit training sequence; iv) combining the correlations for the at least one transmit antennas to produce an overall correlation result for each candidate synchronization position; b) determining a fine synchronization position from the correlation values; using the fine synchronization position from each of the at least one receive antenna in an overall fine synchronization position.