联合多用户调度与协作干扰选择的无线物理层安全研究
Physical Layer Secrecy Analysis of Joint User Scheduling and Jammer Selection

物理层安全策略作为一种利用线信道物理特 性来对抗窃听者的有效手段，已经吸引了越来越多的关注。本文重点研究多用户调度与协作 干扰技术在线通信物理层安全方面的表现，并将两种技术有机结合，深入研究线网络的 通信安全。通过联合采用多用户调度方案与协作干扰技术以增强线通信安全，在多用户 线通信网络中，采用多用户调度策略，在选择最优信道进行通信的同时，对窃听节点进行协 作干扰，在合法用户端通过波束权重矩阵对干扰信号进行合并以消除干扰信号对接收端的影 响，最终达到在不干扰合法通信的前提下极大地干扰窃听信道，最终增强线网络的通信 安全。数值仿真表明，联合多用户调度与协作干扰的方案的安全中断概率明显低于仅采 用多用户调度的方案。
Physical layer security (PLS) is an effective means to protect communications against eavesdropping attacks by e xpl oiting physical characteristics of wireless channels. As the information and com munication technology (ICT) has been developed for decades, PLS attracts mo re and more attention of researchers. Here, PLS performance of the join t multi user s cheduling and the cooperative jammer sele c tion is explored. With the combination of the two techniques, the wireless c ommu nica tion security is investigated. In a wireless communication system wit h multiple users, multi user scheduling schemes are adopted to choose one legi t imate user of the best channel to transmit signals. Meanwhile, the eav esdroppers are interfered to keep the transmissions between BS and legi timate users confidential for avoiding the interference to the legitimate u sers. CJ signal is designed so that nulls are formed at the legitimate users . Simulatio n results show that the joint multi user scheduling and cooperative j a mmer scheme has a better performance of security than the multi user scheduling sch eme.