METHOD AND SYSTEM FOR OFDM SYMBOL TIMING RECOVERY

摘要

A symbol timing recovery module of an OFDM receiver is configured to determine an optimum trigger point for performing a discrete Fourier transform in a manner that minimizes intersymbol interference, by
1) calculating samples of a channel impulse response by inverse Fourier transforming the channel frequency response,
2) estimating a measure of the intersymbol interference that occurs in the communication channel based upon the magnitudes of samples of the channel impulse response above a specific threshold and their relation to a time origin of the channel impulse response that represents the trigger point, and
3) adjusting the time origin of the channel impulse response so as to minimize the estimated intersymbol interference and then adjusting the trigger point for demodulation of subsequent OFDM symbols in the same manner.