Patent ID: 7203261

Claim:
A method of tracking frequency error in an orthogonal frequency division multiplexing (OFDM) communication system, comprising: obtaining a plurality of received modulation symbols for at least one received OFDM symbol; correcting each of the plurality of received modulation symbols with a respective phase correction value to obtain a corresponding phase-corrected symbol, wherein a plurality of phase-corrected symbols are obtained for the plurality of received modulation symbols; detecting phase error in each of the plurality of phase-corrected symbols to obtain a phase error estimate for the phase-corrected symbol, wherein a plurality of phase error estimates are obtained for the plurality of phase-corrected symbols; filtering the plurality of phase error estimates to obtain a plurality of frequency error estimates; and accumulating the plurality of frequency error estimates to obtain the phase correction value for each of the plurality of received modulation symbols, wherein the respective phase correction value used for correcting each of the plurality of received modulation symbols is computed based on the phase error estimate for the phase-corrected symbol and a pseudo-random noise value.