Implementation factors of the multi-rate parallel interference canceller for the IMT-2000 3GPP system

We investigate some implementation factors that affect the performance of interference cancellers for the International Mobile Telecommunications-2000 (IMT-2000) 3/sup rd/-generation partnership project (3GPP) system. We consider the multi-rate parallel interference canceller (PIC) that can remove effectively multiple access interference (MAI) through block-based detection and sample-based cancellation in asynchronous user environments. We evaluate the receiver complexities of the PIC receivers employing the advanced removal scheme. The proposed structure has significantly lower complexity as compared with that of the existing schemes. We analyze the effects of timing error, oversampling rate, unsynchronized users and/or outer-cell interference, and quantization error on the PIC performance through extensive computer simulations. The models for such factors and the optimum parameters are drawn.