放大转发中继网络中绿色的物理层安全通信技术

该文基于物理层安全理论，针对能量受限的无线中继网络提出一种绿色的保密通信方案。该方案在节点功率约束和系统最小目标保密速率要求下，通过最优功率控制实现系统的安全能效最大化，并基于分式规划、对偶分解和DC(Difference of Convex functions)规划理论提出了一种迭代的功率分配算法。通过仿真比较，能效优化可以显著提升系统的安全能效，然而相对于保密速率最大化会有一定保密速率损失，这是由于能效和保密之间存在固有的折中。但是，能效优化的保密速率仍然大于发送总功率最小化的保密速率。

Green Communications Based on Physical-layer Security for Amplify-and-forward Relay Networks

In this paper, a green communication scheme based on physical layer security is addressed considering the energy and secrecy constraints. This scheme maximizes the secure Energy Efficiency (EE) of the network by power allocation subject to the maximum power constraint of each node and the target secrecy rate constraint of the network. Furthermore, an iterative algorithm for power allocation is developed based on fractional programming, dual decomposition, and Difference of Convex functions (DC) programming. It is verified by simulations that the proposed algorithm can lead to a significant gain of secure EE yet with some loss of secrecy rate compared with secrecy rate maximization. This is because that there is an inherent tradeoff between EE and secrecy. However, the achievable secrecy rate of the proposed scheme is still superior over that of total transmission power minimization.