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在认知中继安全通信网络中,研究了自适应解码转发中继节点采用机会式传输策略的物理层安全性能。在满足主用户对干扰功率限制的条件下,推导了在瑞利信道下的安全中断概率的闭合表达式,并进一步推导了安全中断概率性能的渐近表达式,从而可以直观地对系统性能进行分析。仿真结果验证了理论分析的正确性,并揭示了在认知中继网络中各系统参数对机会式传输方案的安全性能的影响。结果表明,可以通过增大主用户的最大干扰功率容限和增加次级中继节点个数来提升系统安全性能。
In the cognitive relay secure communication network, the physical layer security of adaptive decoding and relay relay nodes adopting opportunistic transmission strategy is studied. The closed-form expression of the probability of safety outage under Rayleigh channel is derived under the condition that the primary user is limited to the interference power, and the asymptotic expression of the probability of safety outage is further deduced so that the performance of the system can be intuitively performed analysis. The simulation results verify the correctness of the theoretical analysis and reveal the impact of system parameters on the security performance of opportunistic transmission schemes in cognitive relay networks. The results show that the security performance of the system can be improved by increasing the maximum interference power margin of the primary user and increasing the number of secondary relay nodes.