Performance of a decorrelator based successive interference cancellation multiuser receiver for asynchronous multirate DS-CDMA systems

In this paper we investigate the performance of a decorrelator based successive interference cancellation (DBSIC) multirate DS CDMA multiuser receiver over multipath Rayleigh fading channels with both perfect and imperfect channel side information. Variable Processing Gain (VPG) with various numbers of data rate classes is considered. The performance of DBSIC is presented using an analytical approach and simulations, and its improvement over other commonly-used suboptimum detection schemes such as the decorrelating, minimum mean square (MMSE), SIC, parallel interference cancellation (PIC) and decorrelating decision feedback (DF) receivers is demonstrated. In the case of imperfect channel estimates, it can be observed while all the receivers suffer degradation in performance, DBSIC still outperforms the other detection schemes.