Turbo PIC and antenna diversity for DS-CDMA communications in wireless block fading channel

This work presents a turbo multiuser detector for turbo-coded DS-CDMA systems, which is based on the utilization of parallel interference cancellation scheme and antenna diversity in the receiver. Since a wireless rich-scattering block fading channel is considered, multiple access interference effects are naturally reduced by antenna diversity, and are successively and completely eliminated by a single turbo cancellation iteration, for a half-loaded system. We also show that the proposed turbo-PIC detector is characterized by the remarkable performance in terms of BER even for overloaded systems: particularly, we stress the low complexity required to suppress MAI and achieve excellent results in the block fading environment where the high correlation value strongly limits the single user bound.