A joint scheduling and Beamforming method based on layered limited feedback

Coordinated Multi-Point (CoMP) transmission is a promising scheme which is capable of suppressing the co-channel interference (CCI) and further improves spectral efficiency. In CoMP, the system performance highly depends on the accuracy of Channel State Information (CSI) feedback. Previous works are mainly under an ideal assumption that perfect CSI is available at BSs. However, this consideration is impractical especially in multi-user and multi-antenna circumstance. In this paper, Coordinated Scheduling/Coordinated Beamforming (CS/CB) is considered with limited CSI feedback in homogeneous COMP cellular network. From the perspective of cross-layer design, a layered limited feedback with optimized codebook based CS/CB algorithm is also proposed. Simulation results demonstrated that CS/CB with the proposed layered feedback scheme is capable of achieving higher throughput over traditional single-cell signal processing (SCP) approach with perfect CSIT. Furthermore, the feedback load can be reduced by 88.56% with proposed feedback scheme compare with the traditional feedback approach.