能量采集多天线中继网络中基于人工噪声辅助的安全传输方案

来源:用户上传      作者:任清华 张广大 樊志凯

　　摘要：针对多天线中继系统中继节点面临的可用能量受限问题和存在的严重信息泄露隐患，提出了一种基于能量采集技术的联合中继波束成形和多天线友好干扰机协作干扰的物理层安全传输方案.首先，构建基于放大转发（Amplify-and-Forward，AF）模式的多天线协作中继网络，其次，中继节点和友好干扰机在时隙切换（Time Switch，TS）策略下进行能量采集和保密信号传输.接着，以系统保密速率最大化（Secrecy Rate Maximization，SRM）槟勘辏在满足中继节点和友好干扰机采集能量约束条件下，联合设计出最优中继信号传输波束成形矩阵、人工噪声（Artificial Noise，AN）协方差矩阵和时隙切换系数.然而，由于条件约束，导致该SRM问题为非凸问题，故通过结合半定松弛（Semi-Definite Relaxation，SDR）技术以及拉格朗日对偶理论，设计出一种双层优化算法求得最优解，并且，为了降低复杂度和对比方案性能，给出了一种基于迫零预编码的次优传输方案.最后，仿真结果表明，所提方案能够显著提高系统保密性能，具备一定抗窃听攻击能力.
　　关键词：物理层安全;能量采集;波束成形;协作干扰;保密速率;半定松弛
　　中图分类号：TN918.82文献标志码：A
　　Secure Transmission Scheme Based on Artificial Noise-aided for Energy Harvesting Multi-antenna Relay Networks
　　REN Qinghua ZHANG Guangda FAN Zhikai1
　　（1. Information and Navigation College，Air Force Engineering University，Xi'an 710077，China;
　　2. Key Laboratory of Aerospace Information Applications，China Electronics Technology Group，Shijiazhuang 05008 China）
　　Abstract：Aiming at the problem of limited available energy and serious information leakage risks faced by the relay nodes in the multi-antenna relay system，a physical layer secure transmission scheme of joint relay beamforming and multi-antenna friendly jammer cooperative jamming based on energy harvesting technology is proposed. Firstly，a multi-antenna cooperative relay network based on the amplify-and-forward （AF）mode is constructed. Secondly，the relay nodes and friendly jammers perform energy harvesting and confidentiality signal transmission based on the time switching （TS）strategy. Then，with the goal of the system secrecy rate maximization（SRM），the optimalrelay signal transmission beamforming matrix，artificial noise（AN）covariance and time switching coefficient are jointly designed under the condition of meeting the energy harvesting constraints of the relay and the friendly jammers. However，due to conditional constraints，the SRM problem is a non-convex. Therefore，a Bi-level optimization algorithm is designed to obtain the optimal solution by combining semi-definite relaxation（SDR）technology and Lagrange duality theory，and in order to reduce the complexity and compare the performance of the proposed scheme ，a suboptimal transmission scheme based on zero-forcing precoding is given. Finally，the simulation results show that the proposed scheme can significantly improve the security performance of the system and has a certain anti-eavesdropping attack capability.
　　Key words：physical-layer security;energy harvesting;beamforming;cooperative jamming;secrecy rate;semidefinite relaxation

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