联合MRT/RAS下多天线系统的安全性能分析  

Secrecy Performance Analysis with Maximal-Ratio Transmission and Receive Antenna Selection in MIMO Wiretap Channels

作　　者：陈卓[1] 朱新华[1] 肖祥铠 王松青[3] 李微伟 

机构地区：[1]中国人民解放军75708部队 [2]中国人民解放军73683部队 [3]解放军理工大学指挥信息系统学院

出　　处：《军事通信技术》2014年第3期7-11,共5页Journal of Military Communications Technology

基　　金：国家自然基金资助项目(61371122)

摘　　要：文章分析了在多天线窃听模型中,联合采用最大比发送(MRT)和接收天线选择(RAS)对于物理层安全性能的提升作用。考虑发端、接收端和窃听端处各有NA、NB和NE根天线,发端采用最大比发送的方式发送信息,接收端采用天线选择、窃听端采用最大比接收的方式获取信息,推导了非零安全容量存在概率和安全中断概率的精确表达式。在此基础上,给出了高信噪比下安全中断概率的近似表达式,分析了其安全分集阶数和阵列增益。分析结果表明联合采用接收天线选择和最大比发送可以获得理想的分集阶数NANB。仿真结果验证了理论分析的正确性。The joint effect of Maximal-Ratio Transmission（MRT） and Receive Antenna Se- lection（RAS） on physical layer security enhancement was considered in Multiple-Input Multiple- Output（MIMO） wiretap channels, in the presence of NA antennas at the transmitter, NB anten- nas at the receiver, and NE antennas at the eavesdropper. The closed-form expressions for the probability of nonzero secrecy capacity and the secrecy outage probability were derived. Then, based on the exact expressions, the asymptotic secrecy outage probability was obtained, in which the diversity order and the secrecy array gain were revealed. These conclusions demonstrate that the proposed method can get the ideal diversity order of NANB. Theoretical analysis is verified by simulation results.

关 键 词：多输入多输出 接收天线选择 最大比发送 物理层安全 

分 类 号：TN929.5[电子电信—通信与信息系统]