面向卫星-地面协同通信系统的物理层安全传输设计  

Physical Layer Security Transmission Design for a Satellite-Terrestrial Coordinated Communication System

作　　者：欧阳键 许拔 袁灿 姜杨威 庄天行 

机构地区：[1]南京邮电大学通信与信息工程学院,南京210003 [2]南京电讯技术研究所,南京210007 [3]解放军陆军工程大学通信工程学院,南京210007 [4]南京邮电大学海外教育学院,南京210023

出　　处：《电讯技术》2017年第12期1369-1375,共7页Telecommunication Engineering

基　　金：南京邮电大学校级科研基金(NY214140;NY215135);国防科技项目

摘　　要：为增强多窃听者场景下的卫星-地面协同通信系统数据传输安全性,首先建立以卫星链路物理层安全传输速率最大化为优化准则、地面链路传输质量和信号发送功率为约束条件的卫星-地面协同传输优化问题。由于该优化问题的非凸性,随后通过引入辅助变量,将原问题分解为主、次两个子问题进行迭代求解,其中主问题为一维搜索问题,次问题则需进一步借助半正定松弛和矩阵变换方法转换为等价凸优化问题。最终,提出一种基于物理层安全的卫星-地面协同传输设计方案。计算机仿真结果表明,信号发射功率和卫星天线数的增加可提升系统安全速率,而窃听者数量的增加则会使得系统安全性降低。In order to enhance the secure transmission of satellite -terrestrial coordinated communicationsystem in presence of multiple eavesdroppers, a coordinated transmission optimization problem is estab-lished by applying security rate as the maximization criterion and the transmission quality for the terrestriallink and the transmission power for the satellite and ground base station as constraints. Next, due to thenon-convexity of the optimization problem, the auxiliary variable method is used to decompose the originalproblem into two sub-problems. The main problem is a one-dimensional search problem, whereas the sec-ondary problem can be transformed into a convex problem by means of semi-definite relaxation and the ma-trix transformation approaches. Finally, a satellite -terrestrial coordinated transmission scheme based onphysical layer security is proposed to find the optimal beamforming solution. Computer simulation demon-strates that the increase of signal transmission power and the number of satellite antennas can increase thesecurity rate, while the increase of the number of eavesdroppers will reduce the system security.

关 键 词：卫星-地面协同通信系统 物理层安全 波束成形 凸优化 

分 类 号：TN92[电子电信—通信与信息系统]