Patent ID: 7388922

Claim:
A receiver for recovering data from a received symbol of signal samples generated in accordance with Orthogonal Frequency Division Multiplexing (OFDM), the symbol including pilot signals provided at different sub-carrier locations for each of a set of OFDM symbols, the sub-carrier locations of the pilot signals being repeated for subsequent sets of symbols, said receiver comprising: a pilot assisted channel estimator operable to generate an estimate of a transfer function of a transmission channel through which the received OFDM symbol has passed, the pilot assisted channel estimator including a pilot extractor operable 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 pilot signal in the received OFDM symbol, by comparing the extracted pilot carrier signals with predetermined versions of the pilot carriers, a time interpolation filter controller; and an adaptive bandwidth time interpolation filter operable to interpolate the samples of the channel frequency response estimate derived from the pilot carrier signals at corresponding said sub-carrier locations within temporally separated OFDM symbols to generate an interpolated version of the channel frequency response estimate, wherein the time interpolation filter controller is operable to generate an estimate of a rate of change of the channel frequency response with time and to adapt a pass bandwidth of the time interpolation filter in accordance with the estimated rate of change of the channel.