Patent ID: 7526020

Claim:
A circuit for improving accuracy of channel impulse response estimation and compensating for remnant frequency offset in a receiver of an orthogonal frequency division multiplexing (OFDM) system, the circuit comprising: an equalizer, for compensating a first signal for channel distortion with a channel impulse response estimate adjusted according to a product of an error estimate and a conjugate of a third signal to generate a second signal; a remnant frequency compensation module, coupled to the equalizer, for rotating a phase of the second signal with a phase angle of an phase offset coefficient calculated according to a plurality of pilot signals of the second signal to generate the third signal; and an error estimation module, coupled to the remnant frequency compensation module, for generating the error estimate according to the third signal and a hard decision estimate of the third signal, and the error estimate is further fed back to the equalizer to refine the channel impulse response estimate.