Novel Scheme of CSI Feedback Compression for Multi-User MIMO-OFDM System

AbstractDownlink multi-user transmission has been recognized as a promising technique to increase system capacity. However, they require accurate channel state information (CSI) at the base station such that appropriate signal processing can be performed to separate multiple users in the space domain. It will lead to overwhelming large feedback overhead in multi-user MIMO-OFDM system. In this paper, a novel CSI feedback compression scheme based on the recently proposed compressive sensing (CS) theory to be used in multi-user MIMO-OFDM system is proposed. Simulation results show that our proposed scheme has the potential of reducing the CSI feedback overhead and providing more accurate CSI at the transmitter than the codebook-based method to suppress multi-user interference under multipath channel conditions