多用户选择与协作干扰的安全性能分析

Secrecy Performance Analysis of Multi-user Selection and Cooperative Jamming

研究了一种多用户选择与协作干扰相结合的无线安全传输系统。在Nakagami-m衰落信道下,考虑到信道的反馈延迟对信道状态信息的影响,提出了利用一般阶次选择策略来选择目的用户,并结合协作干扰策略,实现信息的安全传输。针对窃听信道状态信息已知和未知两种不同条件,分别提出了相应传输策略,推导了系统的中断概率和窃听概率的准确表达式。理论分析与数值仿真结果表明,提高用户选择的阶参数能够有效地改善系统的安全性能。

A wireless transmission model of combined multi-user selection and cooperative jamming is investigated.Under the Nakagami-m fading channel model,a general-order selection strategy is proposed to select the destination user upon considering the influence of channel feedback delay on channel state information(CSI),and then a cooperative jamming strategy is incorporated to realize secure information transmission.Under the conditions of known and unknown eavesdropping CSI,two different transmission strategies are proposed,and the corresponding exact expressions for the outage probability and the eavesdropping probability of the system are derived.The results of theoretical analysis and numerical simulations show that increasing the order parameter for user selection can improve effectively the security performance of the system.