Studies Of Performance Full Duplex MIMO Relay System With Self-interference Cancellation

With the development of wireless communication rapidly,wireless spectrum resources are increasingly scarce,how to use the wireless communication resources effectively and improve the capacity of the communication network become a problem urgently to be solved in the next generation communication network.Relay technology because of its less cost can be used to quickly expand coverage and enhance signal strengths and is widely used.Full duplex relay(FDR,Full-duplex relay)technology because it can greatly improve the utilization rate of spectrum for frequency reuse,is likely to be the fifth generation of mobile communication system(5G).Full duplex relay(FDR,Full-duplex relay)technology can provide cost-effective coverage and improve the throughput.However,full-duplex relay(FDR,Full-duplex relay)because of its frequency transmitting at the same time bring serious loop from interference,this will seriously affect it.In this paper,the performance analysis of a full-duplexmaximum ratio combining multiple-input multiple-output(FD-MRC-MIMO)system based on equalize-and-forward(EF)relaying with self-interference-cancellation(SIC)is derived under imperfect channels state information(CSI).The performance of the system is investigated in the presence of additive white Gaussian noise(AWGN)over Rayleigh fading channels.Self-interference cancellation is performed by applying null-space-projection(NSP)via singular-value-decomposition(SVD).Furthermore,exact,closed-form solutions for the signal-to-interference-plus-noise ratio(SINR)distribution and outage probability are mathematically formulated and evaluated along with the average symbol-error-rate(ASER)for –ary phase-shift keying(M-PSK)modulation.The coefficients of the EF-relay are obtained to attain the minimum mean square error(MMSE)between the transmission symbols.Comparison of the obtained results with relevant state-of-the-art techniques suggests significant improvements in the SINR figures and system capacity.