基于子空间冗余的多天线方向调制物理层安全通信技术研究

项目名称： 基于子空间冗余的多天线方向调制物理层安全通信技术研究

项目编号： No.61302102

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 洪涛

作者单位： 南京邮电大学

项目金额： 23万元

中文摘要： 由于无线信道的开放性和电磁信号的广播特性，通信信息在物理层的安全性问题越来越受到人们的重视。近年来，采用多天线方向调制技术实现无线通信信息的安全传输成为物理层安全通信研究的一个重要分支。但方向调制信号在物理层的安全性是建立在窃听接收机是普通数字信号接收机的假设上，在窃听接收机采用盲估计等智能解调算法（如恒模算法）的情况下，增加方向调制信号的安全性是值得探索的方向。本项目申请人在博士课题对于方向调制信号的研究基础上，利用多天线发射子空间选择的冗余度、方向调制信号综合算法解集合中的子空间冗余度和权系数设置的自由度增加窃听接收机接收信号的不确定性，使接收信号与高斯白噪声类似，从而使盲估计等智能算法无法得到收敛的解。本项目从信号调制角度研究无线通信物理层安全问题，涉及基于遗传算法的方向调制信号综合算法、天线子空间选择方法、多天线的加权算法等关键性问题，为方向调制技术在物理层安全通信中的应用奠定基础

中文关键词： 无线通信；物理层安全通信；方向调制；相控阵；优化算法

英文摘要： Due to the broadcast nature of the wireless communication channel and the electromagnetic signal, researchers have come to pay more and more attentions to physical layer security communication for the wireless communication system. Recently, the multi-antenna directional modulation technique has become an important research branch in physical layer security communication. However, the security performance of the directional modulation signal is based on the supposition that the eavesdropper is a digital communication receiver for the traditional digital baseband modulation signal. Therefore, the security performance of the directional modulation signal is worth further investigation under the condition that the eavesdropper employs the blind estimation algorithms to demodulate the directional modulation signal at the undesired direction, such as the constant modulus algorithm (CMA). Based on the doctor research project of the directional modulation signal, this project would further enhance the security performance of the directional modulation signal by utlizing the selection redundancy of the multi-antenna transmit system, the solution set redundancy of the directional modulation sugnal synthesis algorithm and the setting freedom of the transmit antenna weight coefficients. In this case, the uncertainty of the

英文关键词： Wireless communication；Physical_layer security communication；directional modulation；phased array；Optimization algorithm