Abstract:

A new secure transmission scheme is proposed for the communication security of a Successive Relaying（SR） network with multiple eavesdroppers and multiple relays. In order to minimize the average Secrecy Outage Probability（SOP） of the system, at each time slot for the confidential signal transmitting from the source, one best relay is selected to successively forward the signals of the previous slot to interfere with the eavesdropping. Meanwhile interference cancellation is performed at the destination. For performance analysis, the closed-form expression of the average SOP is derived. Simulation results confirm the proposed theoretical results on the average SOP, and reveal that the proposed scheme can significantly decrease the SOP compared with the traditional ways.

Key words: physical layer security, Successive Relaying（SR）, relay selection, Secrecy Outage Probability（SOP）, Amplify and Forward（AF）

摘要：

针对含有多个窃听者、多个中继的无线通信网络的传输安全问题，提出了一种新的轮流中继安全传输方案。以降低系统平均安全中断概率为目标，所提方案在源节点发送保密信息的过程中，在每个传输时隙均选择一个最优中继对前一时隙接收到的信号进行转发以干扰窃听者，并在目的节点处进行干扰消除。为评估系统性能，推导得到了系统平均安全中断概率的闭式表达式。仿真结果验证了理论分析结果的正确性，并表明与传统中继协作方案相比，所提方案可显著降低系统的平均安全中断概率。

关键词: 物理层安全, 轮流中继（SR）, 中继选择, 安全中断概率（SOP）, 放大转发