An adaptive multistage parallel interference canceller for CDMA systems over frequency selective fading channels

In this paper, a bit inversion (BI) procedure in previous works is further investigated over multipath frequency selective fading channels for DS-CDMA communication systems. Moreover, after the BI procedure performed with partial parallel interference cancellation (PPlC) schemes where the partial cancellation weight (PCW) is adapted by the least mean square (LMS) adaptive filtering algorithm, a full PIC is performed to closely cancel the multiple access interference (MAI). Simulation results show that the proposed four-stage BI-based full PIC (BI-FPIC) detector closely cancels the MAI over a two-path frequency selective fading channel and outperforms the LMS-based PPIC schemes.