Patent ID: 7440506

Claim:
A receiver for recovering data from a received symbol of signal samples generated in accordance with Orthogonal Frequency Division Multiplexing (OFDM), the OFDM symbol including pilot carrier signals, said receiver including a pilot assisted channel estimator comprising: a pilot extractor configured to extract the pilot carrier signals from the signal samples, and to generate an estimate of a sample of a channel frequency response for each of the pilot carrier signals in the received OFDM symbol, by comparing the extracted pilot carrier signals with predetermined versions of the pilot carrier signals; a frequency interpolation filter configured to interpolate the samples of the channel frequency response estimate, and a filter controller, the frequency response of the frequency interpolation filter having a pass bandwidth which is adjustable, and the filter controller configured to adjust the bandwidth of the frequency interpolation filter to reduce noise in the estimate of channel frequency response; a phase offset calculator configured to calculate a phase adjustment to the samples of the channel frequency response estimate; and a phase adjuster configured to apply the phase adjustment to the channel frequency response estimate, wherein the phase adjustment when applied has an effect of reducing energy from aliases of the channel frequency response estimate within a pass band window of the frequency interpolation filter.