Patent ID: RE41107

Claim:
A method of receiving CDMA signals with parallel interference suppression in which: a composite signal (r(t)) is received comprising a plurality of K signals corresponding to information symbols which have been spread in frequency by K different pseudo-random sequences, these K signals are correlated using said K sequences , the corresponding K symbols are estimated, the K signals correlated in frequency are reconstructed by despreading re- spreading said estimated symbols through using the corresponding pseudo-random sequences, the contributions of the other remaining (K−1) signals are subtracted from a despread spread signal to provide K new signals, spread in frequency but cleared, at least in part of the interference, this method being characterized in that: all the possible hypotheses on the signs of the NK correlated signals are formulated, where N is a whole number equal to 1 or to a few units greater than zero , for each hypothesis, one calculates the distance metric between the group of correlated signals undergoing processing and the corresponding signals before processing, the hypothesis for which the metric is the smallest is retained, being the hypothesis which has a maximum likelihood, only those signals corresponding to this maximum likelihood hypothesis are reconstructed.