快慢速自适应融合的安全中继选择

摘要

For the physical layer information security in wireless communication,this paper proposes a se-cure relay selection method based on fast-slow fused link adaptive transmission. In this method, fast or slow adaptive transmission is decided according to the mobile velocity. Whether using jamming node or not depends on the “positive” or “negative” effect that the jamming node will play on the secure capacity of the system. On this basis,the relay forwarding the data to the destination is selected by maximizing the se-cure capacity. Performance analysis for the proposed method including the outage probability is given and validated by simulation. More simulation results show that the proposed method has lower bit error rate and lager secure capacity compared with existing methods,and the jamming node is helpful to improve system secure capacity in “positive” effect condition.%针对无线通信中的物理层信息安全问题，在无线安全协作网络中提出了一种基于快慢速链路自适应融合的安全中继选择方法。该方法根据移动速度选择链路自适应类型，根据干扰节点对安全容量的“正”或“负”效应使用或不使用干扰节点，基于安全容量最大化准则进行中继选择。在此基础上，对所提安全中继选择方法进行了性能分析，推导了中断概率表达式。中断概率的仿真曲线和理论曲线很吻合，验证了理论分析的正确性。同时，仿真结果显示，相对于采用单一快速链路自适应，基于所提中继选择方法的安全协作通信系统具有更低的误码率和更大的安全容量，在“正效应”条件下干扰节点有助于提升系统安全容量。