基于协作干扰的全双工中继系统混合安全传输协议

A hybrid cooperative jamming protocol for full-duplex relay wiretap system

针对全双工中继系统的安全问题,提出一种基于协作干扰的物理层安全混合传输协议。系统根据自身信道状态信息,自适应地选择基于中继节点与信源节点轮流发送干扰(RSCJ)协议或基于中继节点与目的节点轮流发送干扰(RDCJ)协议中安全容量相对较高的协议进行信息的传输。在全双工节点自干扰因素被抑制的条件下,给出了系统的传输协议选择策略,并理论推导了采用RSCJ或RDCJ传输协议下系统的安全中断概率表达式。仿真结果表明,利用所提的混合安全传输协议可以显著提高全双工中继系统的安全中断性能,与传统未利用协作干扰的传输机制相比,具有明显的安全性能优势。

A hybrid cooperative jamming protocol was proposed to improve secrecy capacity for the full-duplex relay system with a passive eavesdropper, which chose the relay-and-source-based cooperative jamming （RSCJ） protocol or the relay-and-destlnation-based cooperative jamming （RDCJ） protocol according to the channel state information. Taking the self-interference at both the relay and the receiver into consideration, a protocol selection strategy was proposed and the expressions of secrecy outage probability of the system with RSCJ or RDCJ were derived. Simulation resuhs show that the secrecy performance is significantly improved when the proposed hybrid cooperative jamming protocol is applied. Compared to the conventional transmission scheme, the proposed protocol has significant safety performance advantages.