Adaptive multiuser CDMA detector for asynchronous AWGN channels

A multiuser detector in an additive white Gaussian noise, code division multiple access channel is proposed and analyzed. The detector utilizes the decorrelated tentative decisions obtained in the first stage to estimate and subtract multiple access interference in the second stage. The novel feature of the detector is the adaptive manner in which the multiple access interference estimates are formed, which renders prior estimation of the received signal amplitudes unnecessary. The detector is near-far resistant, and is shown to provide substantial performance improvement over the conventional and decorrelating detector, particularly in the presence of strong interfering signals