A New Serial Interference Cancellation Algorithm Based On Joint Multiple Timeslots Processing

Abstract:
Direct-sequence code-division multiple access (DS-CDMA) is a popular wireless technology. In DS-CDMA communications, all of the users’ signals overlap in time and frequency and cause mutual interference. Serial Interference Cancellation (SIC) multiuser detection is a very promising low complexity approach to handle this problem. In conventional single timeslot based SIC scheme, SIC is performed first, then followed by deinterleaving and Viterbi decoding which use the outputs of the last stage of the SIC as the input. In this paper, a novel multiple timeslots based SIC multiuser detection scheme for coded synchronous DS-CDMA is proposed. The new detector performs joint multiple timeslots successive interference cancellation (JMT-SIC) and Viterbi decoding (VD) in each step of the interference cancellation. Simulation results within the framework of the third generation wireless communication standard TD-SCDMA has shown that the BER performance of the proposed scheme is much better than the conventional one.