A vector perturbation based user selection for multi-antenna downlink channels

Recent works on multi-user transmission techniques have shown that the linear growth of capacity in single user MIMO system can be translated to the multi-user MIMO scenario as well. In this paper, we propose a method pursuing performance gain of vector perturbation in multi-user downlink channels. Instead of exploiting the maximum available mobile users for communication, we employ small part of them as sacrifice lambs for improving quality of service (QoS) of active users. By controlling information and perturbation vector of sacrificing users, we get considerable improvement in the effective SNR, resulting in large gain in bit error performance. Simulation results show that the proposed method brings substantial performance gain over the standard vector perturbation.