摘要： 为评估信道预测发射天线选择（TASP）/接收最大比合并（MRC）联合收发分集无线通信系统在瑞利块衰落信道条件和多窃听者场景下的物理层安全性能，针对基于最小均方误差信道预测器的TASP/MRC无线通信系统，推导其非零安全容量概率、安全中断概率以及渐近安全中断概率的精确解析表达式。在此基础上，分析窃听者数目、归一化延时、收发天线数等参数对系统物理层安全性能的影响。数值计算与仿真结果表明，在TASP/MRC系统中，减小归一化延时及窃听者数量或增加合法接收端天线数能够提高物理层安全性能，在高信噪比情况下，物理层安全分集增益等于合法接收端天线数，而与窃听者数目及其收发天线数无关。

关键词: 物理层安全, 多窃听者场景, 信道预测, 发射天线选择, 最大比合并, 非零安全容量概率, 渐近安全中断概率, 瑞利块衰落信道

Abstract: In order to evaluate the physical layer security performance of Transmit Antenna Selection with channel Prediction(TASP)/receive Maximum Ratio Combining(MRC) wireless communication system over Rayleigh block fading channel in multi-eavesdropper scene,the exact analytic expressions for the non-zero security capacity probability,security outage probability and asymptotic security outage probability of TASP/MRC wireless communication systems based on Minimum Mean Square Error(MMSE) channel predictor are derived.On this basis,the impacts of the parameters such as the number of eavesdroppers,normalized feedback delay,the number of transmit/receive antennas on the physical layer security performance of system are analyzed.Numerical calculation and simulation results show that,in a TASP/MRC system,reducing the normalized delay and the number of eavesdroppers or increasing the number of legitimate receive antennas can improve the physical layer security performance.In the case of high Signal Noise Ratio(SNR),the physical layer security diversity gain is equal to the number of legitimate receive antennas,but has nothing to do with the number of eavesdropper and transmit/receive antennas.

Key words: physical layer security, multi-eavesdropper scene, channel prediction, Transmit Antenna Selection(TAS), Maximal Ratio Combining(MRC), non-zero security capacity probability, asymptotic security outage probability, Rayleigh block fading channel

中图分类号: 

• TN918.1