多天线中继系统中人工噪声辅助的安全波束成形

发布时间：2018-06-06 17:36

本文选题：放大转发 + 人工噪声　；参考：《通信学报》2014年11期

【摘要】：针对放大转发中继系统中转发信息易被窃听者截获的问题,提出了在中继节点处采用人工噪声辅助的安全波束成形方法。该方法以系统的安全速率最大化(SRM,secrecy rate maximization)为目标,在中继节点的总功率和单个天线功率受限情况下,联合设计最优的中继波束成形矩阵和人工噪声协方差矩阵。由于该SRM问题非凸,设计了双层优化算法,其中采用一维搜索解决外层优化问题,采用半定松弛及内点法解决内层优化问题。理论推导证明,内层优化问题总存在秩为1的最优解,即所采用的松弛技术是紧的。仿真结果表明所提的方法可以显著提高系统的安全性能。
[Abstract]:Aiming at the problem that forwarding information is easily intercepted by eavesdroppers in amplifying and forwarding relay systems, a secure beamforming method assisted by artificial noise at relay nodes is proposed. The aim of this method is to maximize the security rate of the system and to design the optimal relay beamforming matrix and the artificial noise covariance matrix under the condition of the total power of the relay node and the power of a single antenna. Because the SRM problem is non-convex, a two-layer optimization algorithm is designed, in which the outer layer optimization problem is solved by one-dimensional search, and the interior optimization problem is solved by semi-definite relaxation and interior point method. It is proved by theoretical derivation that the optimal solution of rank 1 exists in the inner layer optimization problem, that is, the relaxation technique adopted is compact. Simulation results show that the proposed method can significantly improve the security performance of the system.
【作者单位】：国家数字交换系统工程技术研究中心;
【基金】：国家自然科学基金资助项目(61171108,61379006,61401510) 国家高技术研究发展计划(“863”计划)基金资助项目(2014AA01A701)~~
【分类号】：TN92

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