Patent ID: 7342957
Filing Date: 2008-03-11
Classification: H04L

Abstract:
1. A symbol timing recovery method for discrete multi-tone very high data rate digital subscriber line (DMT-VDSL) to recover the correct symbol timing of a signal containing a plurality of DMT symbols and cyclic extensions, the method comprising the steps of: extracting from the signal a sample equal in length to the symbol; converting the sample into the frequency domain and computing its channel frequency response; converting the channel frequency response into the time domain, obtaining two peaks; selecting one of the peaks and using the position and power of the peak to determine a company peak; using the company peak and a corresponding peak to determine whether the peak is a correct peak response; and using the peak response to calibrate the extraction position of the sample in the signal, thereby recovering the symbol timing of the signal, wherein the company peak is at a position of one cyclic extension from the peak and the position of the company peak L where L