Patent ID: 7342957

Claim:
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 1 is: L 1 =L 0 −L CE ,when N/2≧L 0 ≧N/4 ; and L 1 =L 0 +L CE , when L 0 <N/4 ; where L 0 is the position of the corresponding peak, L CE is the position of one cyclic extension, and N is the symbol length.