可调制光学IRS辅助无蜂窝VLC网络的接入资源管理算法  

Joint Resource Management for Tunable Optical IRS-aided Cell-Free VLC Networks

作　　者：贾林琼 冯事成 乐淑娟 施唯 束锋 JIA Linqiong;FENG Shicheng;LE Shujuan;SHI Wei;SHU Feng(School of Electronic Engineering and Optoelectronic Technology,Nanjing University of Science and Technology,Nanjing 210094,China;School of Information and Communication Engineering,Hainan University,Haikou 570228,China)

机构地区：[1]南京理工大学电子工程与光电技术学院,南京210094 [2]海南大学信息与通信工程学院术学院,海口570228

出　　处：《电子与信息学报》2025年第2期397-408,共12页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(62301257);江苏省基础研究计划(自然科学基金)(BK20200488)。

摘　　要：该文研究了一种基于新型光学可调制智能超表面(IRS)辅助的无蜂窝可见光通信(VLC)网络接入方案,其中IRS可以为收发端提供额外的反射信道,也可以利用反射系数可调制的特性,直接为网络用户提供无线接入。该文建立了可调制IRS辅助的无蜂窝VLC接入网络的系统模型,推导了网络吞吐量与发光二极管(LED)照明通信设备的工作模式、IRS的工作模式和用户接入关联之间的关系,并提出以最大化网络吞吐量为目标的接入优化问题。该优化问题分两步求解:(1)当调制模式的LED数和调制模式的IRS数给定时,基于深度确定性策略梯度(DDPG)的深度强化学习(DRL)算法可以得到最优的接入点工作模式和用户接入关联策略;(2)遍历可能的调制LED数和调制IRS元件数即可得到优化问题的解。仿真结果表明,联合优化接入点的工作模式和用户接入关联矩阵可以提高IRS辅助无蜂窝VLC网络的吞吐量。Objective Visible Light Communication(VLC)is emerging as a key technology for future communication systems,offering advantages such as abundant and license-free spectrum,immunity to electromagnetic interference,and low-cost front-end devices.Light Emitting Diodes(LEDs)serve a dual purpose,providing both communication and illumination in indoor environments.However,VLC links are vulnerable,as the interruption of the Line of Sight(LoS)can disrupt communication.The Optical Intelligent Reconfigurable Surface(IRS)has been proposed to enhance communication performance and robustness by reconfiguring optical channels.Two main types of optical IRS materials,mirror-based and meta-surface-based,are commonly used.Mirror-based IRS units introduce additional Non-LoS(NLoS)links with constant reflectance.A cell-free VLC network with the assistance of a newly proposed tunable IRS is proposed and fully investigated.The reflectance of the optical IRS can be dynamically adjusted,allowing it to function as a transmitter by modulating signals on the reflectance with stable incident light.In this system,at least one LED must operate in illumination mode to emit light with constant intensity when any IRS unit is in modulation mode.The IRS can also function in reflection mode to provide additional reflective links,enhancing signal strength.The tunable IRS increases the number of Access Points(APs),enabling ultra-dense VLC networks that significantly improve throughput and spectral efficiency.The system model for a tunable IRS-assisted cell-free VLC network is derived,and the channel gain is calculated using the Lambertian model.The transmission rate for each user is determined by the work mode of the APs and the IRS’s association with the LEDs and users,represented by binary variables.The primary objective of this study is to maximize the total throughput of the IRS-aided VLC network.Methods An optimization problem is formulated to maximize network throughput by jointly optimizing the work mode of the LEDs and IRS units,along with use

关 键 词：可见光通信 光学智能反射面 接入资源管理 最大化吞吐量 DDPG算法 

分 类 号：TN926[电子电信—通信与信息系统]