单窃听双跳协作网络的中继选择方案及其性能分析  

Relay selection schemes for dual-hop cooperative networks with an eavesdropper and their performance analysis

作　　者：阳俐君[1] 曹张华[2] 张士兵[2] 吉晓东[2] YANG Lijun CAO Zhanghua ZHANG Shibing JI Xiaodong(School of Electronics, Information and Engineering, Nantong Vocational University, Nantong 226007, P. R. China School of Electronics and Information, Nantong University, Nantong 226019, P. R. China)

机构地区：[1]南通职业大学电子信息工程学院,江苏南通226007 [2]南通大学电子信息学院,江苏南通226019

出　　处：《重庆邮电大学学报（自然科学版）》2016年第5期648-657,共10页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金(61371111;61371112;61371113;61401238;61401241);江苏省自然科学基金(BK20140433);南通市科技计划资助(BK2014063)~~

摘　　要：研究了安全通信意义下,单向译码转发(decode-and-forward,DF)协作无线网络的中继选择问题。针对窃听者既能获得信源发出的信号,又能窃取中继节点转发数据的通信系统,提出了3种中继选择方案来对抗窃听者,增强系统物理层安全性。其中,方案一选择到窃听者信噪比(signal-to-noise ratio,SNR)最小的中继节点;方案二为最大最小(max-min)选择方案,即选择信源到中继节点和中继节点到信宿的较差信噪比中最大值所对应的中继节点;方案三根据窃听信道和主信道的瞬时信道状态信息(channel state information,CSI)选择使得窃听网络有最大保密容量的中继节点。在对各方案的性能分析过程中,得到了各中继选择方案拦截概率的闭式表示,进一步对拦截概率作渐近分析,获得了各中继选择方案的分集阶数。具体地,方案一的分集阶数为1,另外2个中继选择方案的分集阶数均为中继节点个数M。数值结果验证了理论分析得到的结论。The problem of relay selection for one-way decode-and-forward（ DF） cooperative wireless networks with secrecy constraints is investigated. In this paper,we propose three relay selection schemes to improve physical layer security against the eavesdropper who can eavesdrop on both the source and the relays. The first scheme chooses the relay having the lowest instantaneous signal-to-noise ratio（ SNR） to the eavesdropper. The second one is the max-min approach,which opts the relay has the best worse end-to-end SNR of the relays and destination. The third scheme assumes the instantaneous channel state information（ CSI） of the wiretap channels and the legitimate channels,and maximizes the achievable secrecy rate. Afterwards,the closed-form expressions of intercept probability for the proposed selection schemes were derived. Furthermore,we carry out an asymptotic analysis of intercept probability to evaluate the diversity order performance of the proposed relay selection schemes. Specifically,the diversity order of the first scheme is 1,and other two relay selection schemes achieve the diversity order M,where M is the number of relays. Finally,numerical results are provided to corroborate the analytical results.

关 键 词：中继选择 物理层安全性 译码转发 拦截概率 分集阶数 

分 类 号：TN92[电子电信—通信与信息系统]