Patent ID: 7359442
Filing Date: 2008-04-15
Classification: H04L

Abstract:
1. A method for estimating a time shift for synchronizing to a synch symbol, the method comprising: sampling a received signal to produce a sequence of samples of the signal; performing a transform on the sequence of samples of the signal to produce a sequence of N samples of a spectrum of the signal; multiplying the samples of the spectrum of the signal by respective samples of a spectrum corresponding to the synch symbol to produce a sequence of correlation spectral samples; selecting a contiguous subset of the correlation spectral samples; shifting the selected subset by a number of samples so that an N/d point inverse transform of an output spectrum derived from the shifted subset is an approximation to a decimation by d of an inverse transform of the sequence of correlation spectral samples; and estimating the time shift by detecting a position of a peak in the inverse transform of the output spectrum.