Receiver scheme for space-time coded CDMA system with multiple antennae

By introducing a full-rate space-time block coding (STBC) scheme, a multiuser CDMA system with full-rate STBC is presented. Meanwhile, a low-complexity multiuser receiver scheme is developed, the scheme can make full use of the complex orthogonality of STBC to simplify the high decoding complexity of the existing scheme, it has linear decoding complexity. Compared with those full-diversity space-time block coded CDMA (STBC-CDMA) systems, the presented full-rate STBC-CDMA system can realize full rate transmission, low complexity and form efficient spatial interleaving. Thus the concatenation of channel coding can effectively improve the system performance. Simulation results show that the developed scheme can achieve almost the same performance as the existing scheme. Moreover, on the condition of same system throughput and concatenation of channel code, the proposed full-rate system has lower BER than corresponding full-diversity systems.