中继网络中基于中继节点选择的物理层安全增强方法  

Physical-layer security enhancement method based on opportunistic relay selection in relay networks

作　　者：丁晓进 张登银[1] DING Xiaojin;ZHANG Dengyin(College of Internet of Things,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学物联网学院

出　　处：《南京邮电大学学报（自然科学版）》2019年第6期41-46,共6页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：江苏省高等学校自然科学研究基金(18KJB510030)资助项目

摘　　要：文中考虑了一个协作中继网络场景,其中包含一对传输节点、多个中继节点和一个窃听节点,该窃听节点会窃听由源节点和中继节点所传输的数据。为提升无线数据传输的物理层安全性能,提出了一种机会中继选择机制,从成功译码的中继集合中选择瞬时信道容量最大的中继节点用于辅助源节点进行数据传输。分别分析了所提出的机会中继选择机制和传统轮询机制的零安全容量概率,其中轮询机制用于与所提机制进行性能对比。结果表明所提机制能够比轮询机制取得更好的零安全容量概率性能。此外,所提机制的零安全容量概率随着中继节点数的增加而降低,然而轮询机制的零安全容量概率在中继数增加时保持不变,证明了机会中继选择机制在提升无线传输物理层安全性能方面的优越性。A cooperative relay network, including a pair of source and destination, multiple relays and an eavesdropper, is explored. The eavesdropper can intercept the data transmitted by the source and relays. An opportunistic relay selection(ORS) scheme is used to enhance the physical-layer security(PLS) of wireless transmissions, which will select a relay from successfully decoded relay sets to assist wireless transmissions of the source node. The probability of zero secrecy capacity(PZSC) of both the ORS scheme and traditional round-robin scheme is analyzed. The performance of the round-robin scheme is compared with that of the ORS scheme. The result shows that the ORS scheme can achieve a better PZSC performance than the round-robin scheme. Moreover, the PZSC of the ORS scheme decreases as the number of relays increases, whereas the PZSC of the round-robin scheme keeps unchanged, demonstrating the advantage of the ORS scheme in terms of increasing the PLS of wireless transmissions.

关 键 词：物理层安全 中继选择 窃听事件 零安全容量概率 

分 类 号：TN929.5[电子电信—通信与信息系统]