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。
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
Abstract: 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.
Key words:
cooperative communication,
relay selection,
power allocation,
physical layer security,
Secrecy Outage
Probability(SOP),
Decode-and-Forward(DF)
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