全双工能量受限中继网络的安全波束成形设计

为了解决全双工能量受限中继网络的无线物理层安全问题，提出了一种基于能量和信息联合传输的安全波束成形方法.在满足中继节点和能量收集节点收集能量的约束条件下，通过联合优化能量信号协方差矩阵、波束成形矩阵和功率分配因子，实现了系统安全速率最大化.目标问题是非凸的，采用分步优化方法将原始问题转化为2个子问题.将第1个子问题转化为双层优化问题，外层优化问题采用一维搜索求解，内层优化问题采用半定松弛技术解决；然后通过一维搜索得到第2个子问题的最优解.仿真结果表明，提出的方法显著提高了系统的安全速率.

Secure Beamforming Design for Full-Duplex Energy-Constrained Relaying Networks

In order to solve the problem of optimizing the security rate of full duplex relay eavesdropping channel with energy harvesting capability, a secure beamforming design was proposed under simultaneous wireless information and power transfer (SWIPT) method. An optimization problem was considered aiming to maximize the secrecy rate of the system by jointly optimizing the beamforming matrix, energy signal covariance matrix and the power splitting ration under the constraint of the energy harvesting of the relay and energy-harvesting node. Since this problem is a non-convex secrecy rate maximization (SRM) problem, We use a step-by-step optimization approach to turn the objective problem into two sub-problems was decoupled. The first subproblem can be recast as a two-level optimization problem. Among them, the outer optimization problem was solved by one-dimensional search, and the inner optimization problem was solved by semidefinite relaxation (SDR) technique. The second subproblem can be solved by one-dimensional search. Simulation results show that the proposed method increases the security rate of the system.