全双工目的端加扰安全传输系统中的天线模式切换

在包含一个单天线信源、一个单天线窃听者和一个多天线全双工目的端的无线窃听信道通信系统中，提出并解决了最大化可达安全速率的优化问题。为最大化全双工目的端加扰无线通信系统的可达安全速率，基于动态天线模式切换和最优功率分配技术，设计了一种两步走联合优化方案。具体地，基于全局信道状态信息，首先推导出最优功率分配因子的闭合表达式。结合最优功率分配因子闭合式，设计了一种基于贪婪策略的天线模式切换方案，分别得到最优的发射和接收天线集。仿真结果验证，采用本文所设计联合优化方案的全双工目的端加扰无线通信系统的安全性能远优于传统全双工目的端加扰无线通信系统。 

Antenna Mode Switching for Full-Duplex at a Destination of a Jamming Secure Transmission System

We investigate the secrecy rate optimization problem in a wiretap channel with a single-antenna source, a single-antenna eavesdropper, and a multiple-antenna full-duplex (FD) destination. We design a near-optimal joint optimization algorithm by jointly applying the dynamic antenna mode switching (AMS) and optimal power allocation (OPA) techniques, to maximize the secrecy rate of FD destination-based jamming (DBJ) system. Specifically, a closed-form of OPA factor is first derived using global instantaneous channel state information (CSI), and then the optimal transmit and receive antennas sets at the destination are determined by combining the OPA factor and applying a greedy search-based approach. Simulation results verify the secrecy performance superiority of the proposed algorithm over the traditional FD-DBJ method.