基于液晶RIS辅助的VLC系统物理层安全方法  

Physical layer security method for VLC system based on liquid crystal RIS assistance

作　　者：钱磊 李东骏 吴方乾 孙洪亮 QIAN Lei;LI Dongjun;WU Fangqian;SUN Hongliang(School of Electronic and Information Engineering,Tiangong University,Tianjin 300387,China;School of Electoronic Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China;College of Information and Control Engineering,Jilin Institute of Chemical Technology,Jilin Jilin 132022,China)

机构地区：[1]天津工业大学电子与信息工程学院,天津300387 [2]北京邮电大学电子工程学院,北京100876 [3]吉林化工学院信息与控制工程学院,吉林吉林132022

出　　处：《光通信技术》2024年第5期41-45,共5页Optical Communication Technology

基　　金：国家自然科学基金项目(62301359)资助。

摘　　要：为了提高可见光通信(VLC)系统的物理层安全性,提出了一种基于液晶可重构智能表面(LC-RIS)辅助的VLC系统物理安全方法。在传统的VLC系统接收端引入折射率可控的LC-RIS,通过外加电场对入射光链路折射率的调控,增加合法信道与窃听信道之间的差异性,从而增加VLC系统的可达安全传输速率。仿真结果表明:相比传统的VLC系统,所提出方法的VLC系统的可达安全传输速率提升了1 bit/(channel use),有效地提高了通信的安全性能;基于粒子群(PSO)算法的LC-RIS折射率优化算法具有较好的鲁棒性。In order to improve the physical layer security of visible light communication(VLC)system,a physical security method based on liquid crystal reconfigurable intelligent surface(LC-RIS)assistance is proposed.LC-RIS with controllable refractive index is introduced into the receiving end of the traditional VLC system,and the difference between the legitimate channel and the eavesdropping channel is increased by adjusting the refractive index of the incident optical link with applied electric field,so as to increase the reachable safe transmission rate of the VLC system.The simulation results show that compared with the traditional VLC system,the reachable safe transmission rate of the proposed VLC system is increased by 1 bit/channel use,and the security performance of the communication is effectively improved.LC-RIS index optimization algorithm based on particle swarm optimization(PSO)algorithm has good robustness.

关 键 词：可见光通信 物理层安全 可重构智能表面 安全容量 粒子群算法 

分 类 号：TN929.1[电子电信—通信与信息系统]