Patent ID: 7725090

Claim:
An automatic frequency correction device in a wireless receiver, the wireless receiver demodulating and decoding an original received signal and delivering the demodulated and decoded signal and an estimated channel to the device, the device comprising: a re-coding and re-modulating unit that encodes and modulates the demodulated and decoded signal into a re-coded and re-modulated signal using a scheme different the received signal; a reconstruction unit connected to the re-coding and re-modulation unit, and which receives the estimated channel and the re-coded and re-modulated signal to generate a reconstructed signal; a frequency offset estimation unit connected to the reconstruction unit for calculating an offset amount using the reconstructed signal and the original received signal; a comparator that receives the estimated channel to determine a threshold; and an offset estimate adjustment unit connected to the output of the comparator and the frequency offset estimation unit, wherein the offset estimate adjustment unit adjusts the frequency offset based upon the comparator output and the offset amount.