Patent ID: 7106720

Claim:
A receiver for receiving a transmitted signal in multiuser spread spectrum wireless telecommunication systems, in which the transmitted signal includes at least one periodically updated code of a predetermined type, the receiver comprising: a RAKE despreader for despreading at least one sample of said transmitted signal to output at least one despread signal; a background noise estimator for obtaining a background noise estimation by combining said at least one periodically updated code of the predetermined type with said transmitted signal; and a decision unit, which receives said despread signal and said background noise estimate, and determines if a value representing the likelihood of detection of the code exceeds a predetermined threshold, wherein in the case of a pilot signal not detected within a predetermined time period corresponding to a period of the periodically updated code, the background noise estimator obtains a new background estimation; wherein obtaining the new background noise estimate results in performing the operations of detecting the code of the predetermined type upon a set of samples having a noise estimation using a same time slot for the code of the predetermined type as the samples.