Joint multiuser detection and beamforming with power control in synchronous CDMA system

Power control, beamforming and multiuser detection (MUD) can suppress interference in CDMA systems. In this paper by exploiting characteristic of beamforming and MUD, we propose a new decorrelating multiuser detection algorithm from beamforming gain and correlating matrix. For computation complexity, we further propose an algorithm of decorrelating MUD on clustered users. While beamforming can cancel out most of the interference from users out of cluster, MUD for clustered users can suppress the remaining interference. This algorithm can cancel out most of the MAI and at the same time need much less computation. Simulation results show the improvement brought by this algorithm