A Novel Coordinated Method with Enhanced Feedback in MIMO Cooperate Communications

Abstract

Multiple-Input Multiple-Output (MIMO) technique is applied in 3rd Generation Partnership Project (3GPP) Long-Term Evolution (LTE) to enhance system throughput. Moreover, aiming to improve performance of the cell edge user, Cooperative Multi-Point Joint Transmission (CoMP JT), one of the key technologies in LTE-Advanced, utilizes multiple cells to transmit the user data. This paper presents a novel SU/MUCoMP JT scheme based on enhanced CQI (Channel Quality Index) feedback. The implementation of the proposed scheme is described in detail and its performance is verified by system level simulations. The paper demonstrates how downlink CoMP MIMO JT can be supported by an enhanced feedback method with reasonable feedback overhead, and how the current users transmission points are determined. Finally the improvement in system throughput brought by this method is verified.