A new pilot-added CDMA multiuser detection scheme - SCCS detector & its performance in multipath channels

A new pilot-aided multiuser detection scheme, single code cyclic shift (SCCS) detector, is proposed in this paper for synchronous CDMA multiuser signal reception in a mobile communication environment. The salient feature of the proposed detector is that a receiver can decode multiuser signals even without explicit knowledge of all signature codes currently active in the system. The transmitting signal consists of orthogonal carrier modulated pilot and data signals; the former consists of periodically repeated pilot symbols encoded by the same signature codes as the one spreading the latter. A matched filter bank, consisting of M correlators that match to distinct cyclicly shifted versions of a "single" signature code, is employed for "channel cyclic shift correlation function" estimation, followed by the multiuser detection algorithm based on the channel information obtained earlier. The performance of the proposed SCCS detector is evaluated and compared to decorrelating detector by analysis and simulation considering various multipath channels with different profiles. The results demonstrate that a synchronous CDMA joint detection can be implemented even without knowing all signature codes of the system.