Performance of a new PIC receiver for the reverse link of a DS-CDMA system in a Rayleigh fading channel

Abstract

Consider the reverse link of an asynchronous DS-CDMA system in which each user's signal is transmitted over a channel with Rayleigh fading and AWGN. For the CDMA system a new parallel interference cancellation (PIC) receiver with an adaptive decision threshold is proposed which is complete with the method to adjust the decision threshold. The decision threshold for partial cancellation is adjusted according to the statistics of its matched filter (MF) outputs. The BER of the proposed PIC receiver is obtained by simulation and compared with those of the conventional PIC and other PIC receivers in a Rayleigh fading channel. It is shown that the proposed PIC receiver achieves better performance than the conventional PIC receiver and the PIC receiver using null zone hard decision in a Rayleigh fading channel.