Energy Efficiency Optimization Based Self-Interference Cancellation in Massive MIMO Full-Duplex System

This paper focuses the problems of self-interference cancellation (SIC) in single cell massive MIMO full-duplex system. Based on the current research, some traditional SIC schemes are difficult to be applied in massive MIMO full duplex system since these schemes require the instantaneous channel state information (CSI) of self-interference channel (CSI-SI) but the instantaneous CSI-SI is unable to obtain in massive MIMO. In addition, the other feasible SIC schemes without the instantaneous CSI-SI will reduce the system energy efficiency significantly. Therefore, we propose a energy efficiency optimization based SIC scheme (EE-SIC) without the instantaneous CSI-SI, which can eliminate SI effectively and improve system energy efficiency simultaneously by the energy efficiency optimization algorithm. The simulation result demonstrates that the proposed EE-SIC scheme is not only able to eliminate SI effectively for improving the sum achievable rate, but also improve the energy efficiency significantly compared with the self-interference cancellation scheme without energy efficiency optimization. Furthermore, it can make the uplink and downlink achievable rate both increase with the number of users uniformly.