METHOD AND RECEIVER DEVICE FOR ESTIMATING A FREQUENCY OFFSET AND A FREQUENCY DRIFT OF A USEFUL SIGNAL

摘要

The present invention concerns a method (50) for estimating a frequency offset and a frequency drift affecting a useful signal comprising a code word formed by a channel encoder, comprising an analysis phase (51) comprising: - for two analysis frequency drifts: compensation (52) of the analysis frequency drift on the useful signal, - an estimation (53) of the frequency offset on each useful signal obtained after compensation, - a selection (54) of frequency hypotheses, and an estimation phase (55) comprising: - for each frequency hypothesis: frequency recalibration (56) of the useful signal depending on the frequency hypothesis, in order to obtain sample sequences, - an evaluation (57) of the probability of each sample sequence being a code word of said channel encoder, - an estimation (58) of the frequency offset and the frequency drift depending on the most probable frequency hypothesis.