机会中继协同通信系统在Nakagami-m衰落信道中的折中性能分析及系统优化  

Tradeoff performance analysis and system optimization of opportunistic relay cooperative communication system under Nakagami-m fading channel

作　　者：彭磊 臧国珍 高媛媛 沙楠 蒋炫佑 Peng Lei;Zang Guozhen;Gao Yuanyuan;Sha Nan;Jiang Xuanyou(College of Communication Engineering,Army Engineering University of PLA,Nanjing 210007,China)

机构地区：[1]陆军工程大学通信工程学院

出　　处：《计算机应用研究》2019年第12期3823-3826,共4页Application Research of Computers

基　　金：国家自然科学基金资助项目

摘　　要：针对外部窃听者对多中继协同通信系统中信息传输带来的安全威胁,提出一种由中继节点在转发信息的同时发送人工干扰信号的协同安全传输方案,并对该方案在Nakagami-m衰落信道中的安全性能进行了分析,推导出用于评估机会中继系统可靠性的中断概率和安全性截获概率的闭式表达式,并在此基础上从可靠性和安全性两方面对系统的折中性能进行了讨论。通过仿真,验证了推导的正确性,明确了中继个数对系统折中性能的影响。最后,为进一步提高系统折中性能,讨论了系统中人工干扰信号与通信信号间的功率分配问题,并通过仿真得到了能使系统折中性能达到最优的功率分配因子。Regarding to the security threat to the information transmission from the external eavesdropper in the multi-relay cooperative communication system,this paper proposed a cooperative secure transmission scheme,that relayed forwards information and sent artificial interference simultaneously. Also,this paper analyzed the security performance of the scheme under the Nakagami-m fading channel,and derived the exact closed-form expressions of outage probability and intercept probability. Moreover,this paper discussed the tradeoff performance of the system from two aspects of reliability and security. Through simulation,it verified the correctness of the derivation,and clarified the impact of relay number on the tradeoff performance of the system.Finally,in order to further improve the tradeoff performance of the system,this paper also discussed the power allocation problem between the artificial interference signal and the communication signal,and obtained the power allocation factor which could make the tradeoff performance optimal by simulation.

关 键 词：协同通信 NAKAGAMI-M衰落信道 中继选择 中断概率 截获概率 

分 类 号：TN918.91[电子电信—通信与信息系统]