Patent ID: 6662000
Filing Date: 2003-12-09
Classification: H03J,H04L

Abstract:
A method of synchronising a communication receiver, comprising the steps of evaluating a deviation between a modulation frequency, combined with a first baseband signal to form a signal transmitted on a propagation channel and a frequency used by the receiver to form a second baseband signal from a signal received on the propagation channel, and adjusting the frequency used by the receiver according to the evaluated deviation,wherein the step of evaluating said frequency deviation comprises, from a time segment of the first baseband signal and a time position of a corresponding segment of the second baseband signal, said segments comprising N samples at a sampling frequency Fe, N being a positive integer, calculating a frequency transform Y(f), of size N, of the product of the complex conjugate of said segment of the first baseband signal by the corresponding segment of the second baseband signal, and determining said frequency deviation &Dgr;f as being that for which the frequency transform Y(f) is the closest to C.Sc(fâˆ’&Dgr;f), where Sc(f) is the function Sc&af;(f)-1-exp&af;(-2&it;j&it;â€ƒ&it;Ï€&it;â€ƒ&it;Nf/Fe)1&it;â€ƒ&it;exp&af;(2&it;j&it;â€ƒ&it;Ï€&it;â€ƒ&it;f/Fe),â€ƒand C is a complex coefficient.