智能反射面辅助通信系统物理层安全问题研究

Research on physical layer security of intelligent reconfigurable surface aided communication system

近年来,智能反射面(IRS)已成为未来无线通信的一项有前途的技术,但信息在无线通信网络传输过程中的物理层安全问题依然备受关注。在智能反射面(IRS)辅助单输入多输出(SIMO)通信系统(收发器之间无直接链路)的系统模型中,传统的随机编码方案只有在传输码字趋于无穷时才可以保证安全。这样的假设在实际情况中并不现实。因此迫切需要一种方案去解决问题。具体而言,文章考虑了合法接收机信道的信道状态信息(CSI)在收发器处可用,而窃听者信道的CSI仅在窃听者处可用的情况,提出了一种新的反馈方案,数值结果表明,该方案显著提高了保密容量。

In recent years,intelligent reconfigurable surface(IRS)has become a promising technology for future wireless communications,but physical layer security in wireless communication networks attracts much attention,in the model of the IRS-aided SIMO communication systems(no direct link),the traditional random coding scheme can guarantee security only when the transmission codeword tends to infinity.Such assumption is not realistic in the actual situation.So there is an urgent need for a solution to solve the problem.Specifically,we consider the case that channel state information(CSI)of the legitimate receiver’s channel is available at the transceiver,and perfect CSI of the eavesdropper’s channel is only available at the eavesdropper.A new feedback scheme is proposed,and numerical results show that these schemes significantly enhances the secrecy capacity.