存在主动干扰窃听方时的物理层安全性能分析  

Performance analysis of physical layer security under an active eavesdropper with the jamming capability

作　　者：李顺[1] 张新豪[1] 

机构地区：[1]黄河科技学院现代教育技术中心

出　　处：《电子测量与仪器学报》2018年第9期102-107,共6页Journal of Electronic Measurement and Instrumentation

基　　金：河南省科技厅产学研项目(152107000093)资助

摘　　要：针对具有主动干扰能力的窃听方严重威胁通信安全,分析了三节点网络下的系统安全性能,为进一步研究该场景下的物理层安全方法指明方向。首先,建立一个三节点复高斯窃听模型,推导安全速率的解析表达式,然后将窃听方的窃听和干扰威胁建模为以安全速率为目标函数的优化问题,进一步将该双自变量最优化问题化简为单自变量最优化问题,并给出基于梯度下降法的最优分配系数求解算法。最后通过数值仿真分析物理层安全性能与窃听方位置、功率和最优分配系数等因素之间的关系,得出经过30次的循环迭代后算法能获取最优解。According to the active eavesdropper with the jamming capability that threats to the system security,this paper analyzes the physical layer security performance and provides ideas to study the physical layer security scheme. Firstly,the three node complex Gaussian eavesdropping model is established and the analytical expression of the secrecy rate is derived. Then,the eavesdropping and jamming threats from the active eavesdropper are modeled as an optimization problem with the objective function of the secrecy rate.Further,the optimization problem with two variables is transformed into a single variable optimization problem,and an optimal allocation coefficient algorithm based on gradient descent method is given. Finally,the simulation results show the effects of the eavesdropping position,the optimal allocation coefficient,the number of loop iterations and other factors on the security performance. The algorithm obtains the optimal solution after 30 cycles of iteration.

关 键 词：物理层安全 安全速率 主动干扰 梯度下降法 

分 类 号：TN92[电子电信—通信与信息系统]