在多用户非可信中继网络中,为提升网络的物理层安全性能,提出机会式调度与协作干扰(OSCJ)策略。推导了所提策略的遍历安全容量(ESC)下界的解析表达式和安全中断概率(SOP)下界的闭合表达式,并给出了ESC性能的渐近性分析。Monte Carlo数值仿真验证了所推导的表达式和性能分析的正确性,并显示所提策略在ESC和SOP性能方面明显优于随机调度和加扰策略。
To improve the physical-layer security performance in the multiuser untrusted relay networks,we propose an opportunistic scheduling combined with cooperative jamming(OSCJ)scheme.We derive the analytical expression of the ergodic secrecy capacity(ESC)lower bound for the OSCJ scheme and the closed-form expression of the lower bound of the secrecy outage probability(SOP).Furthermore,we conduct an asymptotic analysis for ESC.The numerical simulations validate the accuracy of our analysis and show that the proposed OSCJ scheme outperforms the random scheduling and jamming scheme in terms of both ESC and SOP performance.