One-shot multi-user cancellation receiver for wireless CDMA communication systems

This paper deals with a multiuser cancellation detection scheme for direct sequence code division multiple access (DS/CDMA) communication systems where the BPSK modulation technique is used in transmission. Asynchronous users and multipath fading phenomena are considered. The proposed receiver, named the one-shot detector is supposed to be used at the end of an uplink terrestrial channel. The one-shot receiver basic assumption is to divide signals into reliable and unreliable ones. The reliable signals are directly detected and cancelled from the whole received signal so as to improve the decision on unreliable signals. A suitable analytical approach is proposed in order to evaluate error probability (P_e) of the receiver under consideration. Simulation results are also presented to validate obtained analytical predictions. The results shown here clearly demonstrate that the proposed receiver exhibits better performance and lowers the computational complexity and processing delay in comparison with previously proposed alternatives