Patent ID: 8498354
Filing Date: 2013-07-30
Classification: H04L

Abstract:
1. A digital communication receiver, comprising: a radio frequency front end configured to receive a signal using a local frequency oscillator that generates a local carrier frequeney, the local earrier frequency being different from a tranismit carrier frequency generated by a frequency oscillator used by a transmitter that transmitted the signal; residual carrier frequency offset estimation module configured to compute channel frequency responses for pilot subcarrier in the first and second portions of the received signal, perfom an Inverse Fast Fourier Transform on the channel frequency responses to obtain first and second channel impulse responses, estimate a phase difference between the first and second channel impulse responses, and estimate a residual carrier frequency offset using, the phase difference; a buffer for delaying symbols from the received signal while the residual frequency offset estimation module estimates the residual freguency offset; and a residual carrier frequency offset removal module configured to remove the residual carrier frequency offset front the received signal using the delayed symbols from the buffer and the estimated residual carrier frequency offset.