On multiuser detection in asynchronous CDMA flat Rayleigh fading channels


In this paper the performance analysis of lowcomplexity decorrelating detectors will be presented for both coherent and differentially coherent transmission over the multiple-access, frequencynonselective Rayleigh fading channel. While it is known that correlation-type receivers are near-far limited in the case when a single fading path dominates, it is shown that the aforementioned multiuser detectors eliminate the bit error rate floor, alleviate the near-far problem, and rival optimum demodulation for isolated transmission. The results herein apply to wideband and narrowband CDMA systems.