协作网络物理层安全通信系统性能分析

Performance analysis of physical layer security communication system with cooperative jamming

在窃听信道模型基础上加入协作干扰机的协作无线网络模型,研究在非理想信道估计条件下的信道信息进行系统安全速率极大化的功率分配方案优化方法。分别考虑3种不同场景的系统模型,得到最优功率分配下的系统安全速率,并将其与理想信道估计条件下最优功率分配的系统安全速率进行比较,分析了在有信道估计误差的实际通信环境中物理层安全的可实现性,通过数值模拟及结果分析,证明了存在1个最优的功率分配比和相应的发射功率值,使得系统的安全速率达到最大,性能最好。

A cooperative wireless network model based on eavesdropping channel model with the cooperative jammer is studied. Under the condition of non-ideal channel estimation, an optimal power allocation scheme is proposed to maximize the system secrecy rate. We obtain the maximum secrecy rate with the optimal power allocation ratio in three different scenarios of the system model, compare them to the performances under the condition of ideal channel estimation respectively, and analyze the realizability of the physical layer security communication in the actual communication environment with channel estimation error. With the numerical simulations and analysis results we can prove that there is an optimal power allocation ratio to achieve the system maximum secrecy rate and the best system performance.