窃听信道相关条件下最大比传输技术安全分析  

Secrecy Analysis of Maximum Ratio Transmission with Correlated Main and Eavesdropper Channels

作　　者：常玉晴 芮贤义[1] Chang Yuqing;Rui Xianyi(School of Electronics and Information,Soochow University,Suzhou,Jiangsu 215006,China)

机构地区：[1]苏州大学电子信息学院,江苏苏州215006

出　　处：《信号处理》2020年第10期1784-1788,共5页Journal of Signal Processing

基　　金：国家自然科学基金资助项目(61273226,61375028)。

摘　　要：在无线通信系统的实际传输中,当窃听用户距离合法接受者足够近,或者位于合法接收机信号的无线电波路径上时,就会出现主信道与窃听信道相关的场景。为此我们考虑一个多输入单输出,并且存在一个单天线被动窃听者的无线通信系统,研究了当基站采用最大比发射技术发送信号时,相关对系统性能的影响。推导了安全中断概率与平均安全容量的闭合表达式。数值仿真结果表明:(1)当主信道的信道质量高于窃听信道时,较低的相关对系统安全中断概率性能影响不大,然而强相关却能够带来更低的安全中断概率;(2)这种相关对系统平均安全容量始终是有害的,且随着相关程度的增强,最大比发射技术相对于发射天线选择技术的优势逐渐变小。In the actual transmission of the wireless communication system,main channel will be correlated with eavesdropping channel when the eavesdropping user is close enough to the legal receiver or is located on the radio wave path of the received signal.To this end,we consider a wireless communication system with a multiple-input,a single-output and a single antenna passive eavesdropper.We studied the impact of correlation on system performance when the base station uses maximum ratio technology to transmit signals.The closed expressions of secrecy outage probability and average secrecy capacity are derived.Numerical simulation results show that(1)when the channel quality of the main channel is higher than the eavesdropping channel,weak correlation has little effect on the secrecy outage probability of this system,but in strong correlation the secrecy outage probability decreases obviously;(2)This correlation is always detrimental to the average secrecy capacity,and as the degree of correlation increases,the advantage of the maximum specific transmission technology over antenna selection gradually decreases.

关 键 词：信道相关 窃听 最大比发射 安全中断概率 平均安全容量 

分 类 号：TN918[电子电信—通信与信息系统]