Patent ID: 7675983

Claim:
A baseband receiver configured to mitigate effects of direct current (DC) distortion and process an Orthogonal Frequency Division Multiplexing (OFDM) signal as provided from a direct conversion radio, the baseband receiver comprising: an OFDM demodulator configured to demodulate the OFDM signal; a post processor coupled to the OFDM demodulator and configured to provide symbols corresponding to the OFDM signal; and a compensator coupled to at least one of the OFDM demodulator and the post processor and configured to reduce error rates out of the baseband receiver that result from DC distortion in subcarrier amplitude and phase in the direct conversion radio, wherein the compensator further comprises a selector responsive to an estimate of frequency error and configured to select channel estimation filters where one or more particular filters are selected in accordance with a subcarrier spacing relative to the DC distortion and wherein the compensator is configured to erase pilot symbols that have been impacted by the DC distortion before using the channel estimation filters to determine characteristics of a channel for the OFDM signal.