Joint precoding selection diversity with limited feedback

Coordinated multiple-point transmission (CoMP) is one of important techniques for the reduction of inter-cluster interference. Three major schemes have been presented for CoMP-joint processing transmission (CoMP-JPT) under limited-feedback environments: global, local, and single-frequency network precoding methods. However, most previous studies have demonstrated effectiveness only in specific environments without presenting numerical analyses. In this paper, we verify the characteristics of each precoding scheme based on zero-forcing beamforming (ZFBF) with semi-orthogonal user selection (SUS) by exploiting numerical analysis. In addition, we propose a selection algorithm that achieves the diversity of the precoding schemes based on limited feedback according to the downlink channel status of cellular systems. In addition, for the 3rd Generation Partnership Project Long Term Evolution-Advanced (3GPP LTE-Advanced), a network protocol that is required to adapt the CoMP-JPT scheme is implemented. Through simulations, we demonstrate that the proposed system can effectively improve the quality of service for cell-edge users while guaranteeing fairness compared to the conventional precoding schemes.