Correlation-based Overlapping User Grouping with Two-stage Precoding in IoT Oriented 5G MU-MIMO Systems

Overlapping user grouping based on adjusted maximum correlation value (OUG-AMCV) has been proposed in Multi-User Multiple-Input Multiple-Output (MU-MIMO) systems with zero forcing precoding. It achieves higher throughput and much lower complexity when compared with capacity-based greedy zero-forcing schemes. In this paper we combineOUG-AMCV method with two-stage precoding technique and investigate its performance in more practical IoT oriented 5G MU-MIMO environmentwith imperfect 3D channel estimation. The proposed algorithm further increases system capacity and reduces computational complexity.