Performance Analysis Of The Two-Way Full-Duplex Relay Systems

The Information and Communication Technology(ICT)represented by 4G has been in official business widely,the wireless communication technology is profoundly affecting and catalyzing the transformation of the information industry,which is currently booming the mobile Internet.At the same time,the technologies of new air interface and new network architecture in wireless communication systems have become hot research fields.However,the spectrum resources available are becoming more and more scarce,the spectral efficiency of the wireless communication system needs to be improved to support the growing demand for data transmission capacity.Then the fifth-generation mobile communications(5G)has become a global R&D focus for the year 2020 and the future.The technological innovations of 5G mainly comes from wireless transmission technology and network technology.In the aspects of wireless transmission technology,Co-frequency and Co-time Full Duplex(CCFD)is considered to be one promising technology which can significantly increase the spectrum efficiency.And the performance of user experience of 1Gbps and low latency less than 1ms in 5G application scenarios will be improved with the Full-Duplex technology.External contradictions between the exploding traffic of wireless communication and the shortage of spectrum resources are driving the internal changes in the aspects of wireless communication theory and technology.To enhance the spectrum efficiency of FDD and TDD,and to eliminate the differences of spectrum resources usage and management are becoming goals of the future mobile communication technology innovations.Based on the theory and technology of self-interference suppression,full duplex technology is to achieve this goal as one of the potential solutions.In theory,the spectrum efficiency of full duplex can be doubled.Therefore,the scene analysis and performance evaluation of full-duplex technology in the application of the wireless communication system is particularly important,which can provide theoretical support for the technology in the actual system deployment.The innovation and contribution of our work not only lie in establishing one new model of Full-Duplex two-way relay system,but also in the aspects of theoretically deriving the closed-form expressions of outage probability and the system capacity.Besides,we investigate the optimized power allocation of the relay in the case of Decode-and-Forward mode.For the outage probability,this paper carried out derivation and analysis of the link outage probability,and obtained the closed expressions.Considering asymmetric rates scenarios,the system outage probability are also derived in closed-form expression.In the simulation sections,we conduct the numerical simulation and Monte Carlo simulation for the link outage probability and system outage probability respectively,and the results show that the results of numerical analysis and Monte Carlo simulation results coincide to verify the theoretical derivation of this paper correctly.In terms of system capacity analysis,this paper gives an upper bound for Full-Duplex bi-directional relay system transmission capacity from the theoretical derivation expression,which can be as treated the metrics of this communication system.