物理层安全的存在性实验研究

Experiment investigation on existence of physical layer security

物理层安全常用的衡量指标是安全容量,实际多变环境下很难一直满足信道条件制约,此时安全性用安全容量来衡量不够全面。在基于GNU Radio搭建起的软件无线电实验平台上研究了实际工程中表征物理层安全性的参数以及合法信道条件与窃听信道条件的相对关系对物理层安全存在性的影响,实验结果表明安全容量大于零的概率在实际中能较全面反映物理层安全的存在性。同时,还研究了协作拥塞对系统安全性的影响,分析结果表明协作拥塞技术是一种可突破信道条件制约的、有效的物理层安全技术。

The physical layer security capacity is often used as the parameter to evaluate the physical layer security performance. But when the condition of main channel is worse than that of eavesdropper channel, the physical layer security capacity does not exist. If the channel limitation is not strictly satisfied, which parameter is more suitable to evaluate the security performance in practice？ An experiment platform has been built based on the software defined radio to evaluate the security parameters in practice. The experimental results show that the probability of that security capacity is greater than zero can comprehensively reflect the existence of the physical layer security. Meanwhile, the cooperative jamming technology is also investigated. It can be shown that the cooperative jamming is able to break through the restriction of channel condition to achieve physical layer security.