Patent ID: 8553810

Claim:
An apparatus comprising: an estimator for performing frequency-offset and channel estimation based on a preamble portion of a received data packet; a partitioner for partitioning a payload portion of said received data packet into segments; and a tracking processor for applying frequency-offset tracking and channel-gain tracking based on said segments of said payload portion, the tracking processor being configured to: apply an initial frequency offset compensation and channel equalization to symbols in a current segment by using estimates of a residual frequency offset and a residual channel gain established on the basis of symbols in a previous segment, so as to obtain channel-equalized symbols; demodulate the channel equalized symbols, so as to obtain demodulated symbols; remove modulation in the channel-equalized symbols by using the demodulated symbols, so as to obtain modulation-removed symbols; estimate a residual frequency offset for the current segment based on a predetermined number of the modulation-removed symbols; frequency-offset compensate the modulation-removed symbols on the basis of the residual frequency offset that has been estimated for the current segment, so as to obtain frequency-offset-compensated modulation-removed symbols; estimate a residual channel gain for the current segment on the basis of the frequency-offset-compensated modulation-removed symbols; and store the residual frequency offset and the residual channel gain, which have been estimated for the current segment, to apply an initial frequency offset compensation and channel equalization to symbols in a subsequent segment by using the residual frequency offset and the residual channel gain, which have been estimated for the current segment.