Patent ID: 6853616

Claim:
A method of interlocking FFT window position recovery with sampling clock control in symbol units in an orthogonal frequency division multiplexing (OFDM) receiver for receiving an OFDM symbol consisting of a useful data interval and a guard interval, the method comprising the steps of: (a) extracting a pilot signal from fast-Fourier-transformed OFDM received signals, and detecting inter-pilot phase differences; (b) averaging phase differences detected in step (a) for a symbol to generate a mean phase difference value and normalizing the mean phase difference by dividing the mean phase difference value into reference values corresponding to phase differences generated when FFT window errors of at least one sample exist, thereby to generate a normalized value; and (c) simultaneously controlling the FFT window position offset using a value obtained by rounding off the normalized value of the step (b), and the sampling clock offset using the difference between the round-off value and the normalized value.