A new multi-stage weighted interference cancellation multiuser detector with user ordering for DS-CDMA

Conventional multi-stage multi-user detectors (MUD) such as the parallel interference cancellation (PIC) MUD suffer from error propagation. In this paper, we propose a new multi-stage MUD in which reliability weighting factors are applied to reduce error propagation. An algorithm is derived for optimizing both the reliability weighting factors and decision order for the proposed structure. Simulation results show that the proposed MUD almost achieves the single user bound with just a few stages.