Design of an efficient RAKE receiver architecture for multiuser detection with adaptive channel estimation

In this paper, we propose an efficient implementation scheme of wideband version of parallel interference cancellation (PIC) called regenerative PIC for multiuser detector with Rayleigh fading multipath channel and multiple access interference (MAI). Multiuser detection shall be used in the receiver. The successive PIC scheme cancels the interference of all users simultaneously. The multistage PIC suppresses the multiple access interference in multiple consecutive steps. Stage n cancels the interference by utilizing the hard symbol decision from stage n-1. The cancellation operation itself requires knowledge of the user codes, the relative code phases, complex estimates for the multipath taps, and finally hard symbol decisions for each user.