Procedure and estimation module of the frequency bias in a digital telecommunications system

摘要

Estimation procedure (30) of a frequency bias affecting a digital signal representative of a frame of symbols emitted by a terminal (10) destined for a station (20) of a digital telecommunications system (1), said bias corresponding frequency to a deviation between a central frequency that is assumed to a frequency spectrum of the digital signal and a real center frequency of said frequency spectrum, characterized in that the method includes the steps of: - (300) obtaining the digital signal by means of sampling of an analog signal, representative of the symbol frame, with a sampling period Te less than a predefined time of each of the symbols in the frame, so that the digital signal includes at least three samples per symbol, - ( 304) estimation of the frequency bias that affects the digital signal as a function of calculated quantities (302) for respectively Np pairs of selected samples of m All of said even Np pairs necessarily belong to the same symbol of the frame, each magnitude being representative of a phase difference between the samples of the pair of samples that is considered, the samples of each of the Np pairs being separated by a same D number non-zero sampling periods.