该文研究在不可信解码转发无线中继网络中,基于用户选择的安全通信策略与性能分析.根据直接链路与中继链路的信道增益,本文提出三种不同的选择准则以提升系统的安全性;文章推导了三种选择准则下安全截断概率的闭式解析表达式及渐近表达式.根据渐近表达式和数值仿真结果可知,次优准则可以达到与最优准则几乎相同的系统安全性能.同时部分选择准则也能达到全分集增益性能.%Secure communication in decode-and-forward cooperative networks with untrusted relay in the presence of direct links is investigated in this paper.In the considered system,one base-station is selected for secure transmission to the destination node with the aid of an untrusted relay node.Three selection criteria are proposed to improve the secrecy capacity based on both the direct links and the relaying links.The exact close-form expressions and corresponding asymptotic expressions on secrecy outage probability are derived.From the asymptotic expressions and simulation results,the sub-optimal criterion has the same performance with the optimal criterion.Furthermore,the partial selection criterion achieves the full diversity gain.
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