Patent ID: 7116745
Filing Date: 2006-10-03
Classification: H04L

Abstract:
1. A method for estimating a time shift required for symbol synchronization in a block oriented digital communication system for receiving PHY symbols, the method comprising steps of: producing a first sequence (u(n)) by sampling a received real signal N times over a duration of one PHY symbol; producing a second sequence (U(k)) by performing an N point discrete Fourier transform (DFT) on u(n); producing a third sequence (Y(k)) by multiplying U(k) by a fourth sequence (S*(k)) comprising a complex conjugate of a DFT of a synch symbol; producing a fifth sequence (Y′(k)) by multiplying Y(k) by a window of length N/(2d) from k producing a sixth sequence (Y″(k)) by shifting Y′(k) by k producing a seventh sequence (X(k)) by forming a conjugate symmetric spectrum from Y″(k); producing a eighth sequence (x(n)) by performing an N/d inverse DFT (IDFT) of X(k); and estimating the time shift required for symbol synchronization by detecting a position in time of a peak value in x(n).