窃听环境下协作通信网络的机会中继选择方法  

Opportunistic Relay Selection Method of Cooperative Communication Network Under Eavesdropping Environment

作　　者：李国兵[1] 惠鏸[2] 

机构地区：[1]西安交通大学电子与信息工程学院,西安710049 [2]西安理工大学自动化与信息工程学院,西安710048

出　　处：《计算机工程》2015年第5期139-143,共5页Computer Engineering

基　　金：国家自然科学基金资助项目(61102079;61102061);中央高校基本科研业务费专项基金资助项目

摘　　要：传统的最佳中继选择方法仅依赖于合法用户的信道条件,在存在窃听用户的环境中无法保证信息传输的安全性与私密性。针对该问题,以最小化系统安全中断概率为目标,综合考虑合法用户与窃听用户的信道状态信息,提出一种新的机会中继选择方法。针对解码转发协作通信网络,给出系统总发射功率受限条件下的最佳功率分配方案,并在此基础上设计最佳中继节点的选择方法,推导得到系统安全中断概率的闭式表达式。仿真结果验证了该闭式表达式的正确性,并表明与传统中继选择方法相比,提出的中继选择方法可显著降低系统的安全中断概率。In cooperative communication network, a relay selection procedure is usually based on the channel conditions of legitimate channels in traditional relay selection methods, thus it is hard to guarantee the security and privacy of the transmission in the presence of eavesdroppers. To tackle this problem, an opportunistic relay selection method considering the Channel State Information （CSI） of both the legitimate users and the eavesdropper is proposed to minimize the Secrecy Outage Probability （SOP） in a cooperative Decode-and-Forward （DF） network. Firstly, the optimal power allocation method is given when the total transmit power of the source and relay is constrained. Based on that, the best relay selection algorithm is proposed and the closed form expression of secrecy outage probability is derived. Simulation results verify the correctness of the closed form expression of secrecy outage probability, and show that the proposed algorithm greatly reduces the secrecy outage probability of the system compared with the traditional methods.

关 键 词：协作通信 中继选择 功率分配 物理层安全 安全中断概率 解码转发 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]