Performance Analysis And Energy-Efficient Optimization Of Full-Duplex Relay Systems On QoS Gua Rantee

Full-Duplex(FD)mode allows sending and receiving of data in transmission nodes simultaneously,thus improving spectral efficiency,reducing network congestion and reducing end-to-end delay.Its combination with relay technology leads to higher data transmission rates,spectral efficiency and energy efficiency.Coupled with the recent development of some advanced self-interference cancellation technologies on hardware,full-duplex wireless technology has attracted wide attentions and is going to be applied in the next generation wireless networks.In addition,due to the rapid development of mobile Internet,the rapid increase of system energy consumption has become an urgent problem in the future communication system.Coupled with the worsening environment and the increasing shortage of resources,energy-efficient optimization communication has attracted great attention.It is particularly important to optimize the energy efficiency of full-duplex relay system under the Quality of Service(QoS)of users.Therefore,this thesis studies the energy efficiency(EE)of full-duplex relay system based on QoS guarantee.The main research work are as follows:Firstly,this thesis optimizes the EE of bidirectional transmission FD relay system.Considering actual non-ideal circuit condition,cooperative gain of direct link and residual self-interference(RSI)of relay node,under the condition of data rate constraint and through the joint optimization of transmission power and system transmission time,the optimal resource allocation scheme for energy efficiency of two-way transmission full-duplex relay system was proposed.Simulations show that the gain of the direct link is obvious and has stronger anti-interference ability under the requirement of high-speed transmission.Especially,when the RSI of the relay node is small,the advantages of FD mode in EE comprehensively exceed the half-duplex mode.Secondly,this thesis studies the energy-efficient optimization of a FD relay system that supports caching.Based on the user's behavior data information,user behavior are characterized as user preference metric matrix,and the energy-efficient optimization problem is modeled according to the user preference metric matrix.Based on the genetic algorithm,the problem is solved and a cache content configuration scheme is designed to maximize the EE.Simulations show that the cache allocation scheme proposed in this chapter improves the hit rate of cached content and the energy-efficient performance of the relay system is more obvious compared with the traditional cache allocation scheme.Finally,this thesis studies the energy-efficient optimization of a FD relay system that considers delay protection.Firstly,based on queuing theory,the queuing model of service transmission in FD relay systems is modeled,and the statistical delay is given to characterize the user's QoS requirements.Further,the power allocation algorithm is designed to maximize EE.Simulations show that the power allocation scheme considering direct transmission cooperation improves the anti-interference ability of the relay node and has better energy-efficient optimization performance.