A user selection criterion for vector-perturbation precoding in multiuser systems

In order to support multiple users simultaneously in a multi-antenna downlink system, the zero-forcing (ZF) precoding and dirty paper coding (DPC) approaches have been proposed. It is well-known that the user selection plays a crucial role in improving the performance of multiuser precoding with ZF and DPC. While the user selection criteria based on the sum-rate maximization are extensively studied for ZF and DPC, it is relatively not well investigated for the vector perturbation (VP) approach, which is known to be near optimal. In this paper, we derive a user selection criterion for VP and a greedy algorithm for the user selection in a multiuser system.