Research On Adaptive Full-Duplex Relay Technology Based On Cooperative Communication

With the rapid development of wireless communication technology and the increasing demand for communication quality,how to make full use of limited resources to solve the impact of multipath fading has become an urgent problem to be solved.The emergence of low cost collaborative communication technology has provided new means for wireless communication system to solve the problem of multipath fading and signal coverage extension.In order to play the better advantages of cooperative communication technology and reduce the impact of self-interference factors,this paper mainly studied the problems of the model of the full-duplex cooperative relay system,the relay selection strategy and the power optimal allocation.Firstly,this paper compared and analyzed the system model of the full/half duplex cooperative relay communication system,and the error rate performance and channel capacity of the two systems under different relay forwarding protocols were studied in detail.The simulation results show the advantages and disadvantages of the two relay forwarding protocols of the full/half duplex cooperative relay system.Secondly,this paper proposed a relay selection algorithm based on the source-to-relay(S-R)signal-to-noise ratio threshold and the minimum self-interference of the relay node.Based on this algorithm,an adaptive full-duplex relay system was established,whose interrupt probability formula under equal power distribution were derived and analyzed.The simulation experiment was carried out with the original half-duplex relay system and the full-duplex relay system based on S-R maximum signal-to-noise ratio which shows that the adaptive full-duplex relay strategy is superior to the original relay strategy.Finally,this paper studied the problem of single constraint and joint constrained power optimal allocation of full-duplex relay system.Based on the factors of the maximum transmit power of the source node and the self-interference factor of the selected relay node,this paper proposed an adaptive power optimal allocation strategy.The experimental results show that the interrupt performance and channel capacity performance is better than other power allocation programs.