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本文研究源节点与中继节点发送的信号均能被窃听时,多中继自适应解码转发(decode-andforward,DF)系统的安全性能.根据信道状态信息是否可知,分析最优中继选择(optimal relay selection,ORS)、传统中继选择(conventional relay selection,CRS)和多中继选择(multiple relays selection,MRS)3种方案的安全性能,推导出3种方案安全中断概率的解析表达式.通过渐进性能分析,得到了3种方案的安全分集增益和安全分集阶数.仿真结果验证了理论研究的正确性,并分析得到不同参数对系统安全性能的影响.结果表明多中继场景中,ORS方案对系统的安全性能提升最为明显,3种方案的安全分集阶数相同且均与中继个数有关,窃听信道参数只对系统安全分集增益有影响.最后,给出了系统最佳功率分配方法.
This paper studies the security performance of multi-relay decode-and-forward (DF) system when the signals sent by the source node and the relay node can be eavesdropped.According to whether the channel state information is known, the optimal relay selection , optimal relay selection (ORS), traditional relay selection (CRS) and multiple relays selection (MRS), the analytical expressions of three kinds of scheme safety interrupt probability are deduced. Through the gradual performance analysis, the safety diversity gain and safety diversity order of the three schemes are obtained.The simulation results verify the correctness of the theoretical research and analyze the influence of different parameters on the system safety performance.The results show that in the multi-relay scenario, ORS scheme has the most obvious improvement on the security performance of the system, the security diversity orders of the three schemes are the same and are related to the number of relays, and the eavesdropping channel parameters only affect the system diversity gain.Finally, the optimal system power Distribution method.