协同通信系统中基于协作干扰的无线安全增强

Wireless secure enhancement with cooperative jamming in cooperative communication system

研究了无线协同通信网络中的信息传输安全问题,提出了信源与中继端联合发送人工干扰的物理层安全传输策略,分析了干扰剩余度对合法目的端信道容量和协同系统保密容量的影响,并在此基础上推导了系统安全中断概率的近似表达式。仿真结果表明低信噪比下可控的人工干扰能够有效增强系统安全性能,而高信噪比下干扰剩余度对系统性能的影响更为显著。

This paper investigates the information transmission security in cooperative communication system. Specifically, we propose a coop- erative jamming strategy which enhances physical layer security by utilizing the source and relay joint sending artificial interference, and ana- lyze the impact of degree of interference elimination on the channel capacity for legitimate receiver and the security capacity for the cooperative communication system. For performance evaluation, we also derive the expressions of outage probability of the proposed cooperative jamming strategy. The simulation results show that controllable artificial interference can effectively enhance the system security performance under low SNR region, but the redundancy of interference will affect the secure performance more significant under high SNR region.