Patent ID: 6449470
Filing Date: 2002-09-10
Classification: H04L

Abstract:
Method for estimating the frequency offset in a signal received by a demodulator of a mobile-telephone set, comprising the steps of:calculating an error signal &egr; on the basis of the phase &phgr; of the output signal of the demodulator and of the ideal phase &phgr;o of this signal; calculating estimates of the averages of the signal &egr;(FO-RAW) and of its absolute value (Q-RAW) over a predetermined number of samples, taking a predetermined number of bits (nFO-RAW, nQ-RAW) of these estimates and applying them to means for modelling a function &OHgr;(FO-RAW, Q-RAW) representing the frequency offset; wherein the modelling of the function &OHgr;(FO-RAW, Q-RAW) representing the frequency offset consists in arbitrarily fixing the frequency error &dgr;n at a certain known value for each n of a series of tests, FO-RAWn and Q-RAWn being the corresponding values of FO-RAW and Q-RAW, and in defining the function &OHgr;(FO-RAW, Q-RAW) by the average value of all the errors &dgr;n such that FO-RAW=FO-RAWn and Q-RAW=Q-RAWn.