中继辅助的干扰信道中总体MSE最小化的安全波束成形

针对中继辅助的干扰信道中的通信安全问题,提出了一种基于均方误差的物理层安全编码,最大化窃听者与合法用户估计目标信号的均方误差之差。建立了中继辅助的干扰信道网络的窃听模型,并将物理层安全编码策略用最优化问题描述。将非凸的最优化问题变化为三个子凸优化问题,使其可以利用梯度下降法求解,并利用迭代算法,联合求解发射机、中继和收发机的最优编码矩阵。仿真实验表明,该算法能有效提高系统的安全性能。

Total MSE maximization beamforming for Secure Communications in Relay Aided Interference Systems

In this paper, we investigate the secure communication problem in relay aided interference systems. To solve this problem, we propose a physical layer encoding based on the mean square error. Specifically, a wiretap model of relay aided interference systems is built and the problem of maximizing the difference of mean-squared errors between legitimate users and eavesdropper is formulated as an optimal problem. To simplify the calculation process, the non-convex problem is split and converted into three convex sub-optimal problems. After that, an iterated algorithm which jointly solves the optimal encoder matrices of transmitter, relay and receiver is proposed. Experimental results show that the security performances in different scenarios are effectively improved by using the proposed algorithm.