Parallel interference cancellation receiver for DS-CDMA systems in fading channels

Near-far resistant data detectors for frequency selective fading channels are proposed for the uplink of code-division multiple-access (CDMA) mobile communication systems. Parallel interference cancellation (PIC) is used to suppress the multiple-access interference (MAI) in the receiver. In order to improve the MAI estimates, the multistage principle is used. In this paper, three main issues have been studied: the effect of feeding back the channel estimates from the last stage with a different number of cancellation stages, the hang-up phenomenon as well as means to avoid that in PIC receivers, and the impact of channel estimators on the receiver performance. The PIC based multistage receiver developed in the course of these studies had good performance in fading channels according to the simulation results.