考虑HPSA的IRS辅助室内VLC系统光源优化  

Optimization of light sources for the IRS-assisted indoor VLC system considering HPSA

作　　者：何慧萌 杨婷 施会丽 王平[1] 邴喆 王星 白勃 HE Huimeng;YANG Ting;SHI Huili;WANG Ping;BING Zhe;WANG Xing;BAI Bo(School of Telecommunications Engineering,Xidian University,Xi’an 710071,China;China Coal Xi’an Design Engineering Co.,Xi’an 710000,China)

机构地区：[1]西安电子科技大学通信工程学院,陕西西安710071 [2]中煤能源研究院有限责任公司,陕西西安710000

出　　处：《西安电子科技大学学报》2024年第2期46-55,共10页Journal of Xidian University

基　　金：国家自然科学基金(62071365);陕西省重点研发计划(2022GY-103)。

摘　　要：针对可见光通信(VLC)系统中接收平面光功率分布不均匀的问题,提出了一种基于混合粒子群算法(HPSA)的智能反射面(IRS)辅助室内VLC系统光源优化设计方案。以16个发光二极管(LED)的矩形和混合型布局为例,设置接收光功率方差为适应度函数,将所提出的HPSA与IRS技术相结合,对LED的位置布局、半功率角以及IRS的偏航角与滚转角进行优化。仿真对比了初始的(未经优化)、基于HPSA优化的室内VLC系统,以及基于HPSA优化的IRS辅助VLC系统的性能。结果表明,在考虑一次反射链路的情况下,与初始的VLC系统相比,采用HPSA优化的系统在两种光源布局下的接收光功率以及信噪比波动都明显降低;基于HPSA优化的IRS辅助室内VLC系统在矩形布局下对接收光功率波动的改善与基于HPSA优化的VLC系统效果相当,其在混合型布局下明显低于仅采用HPSA优化的VLC系统的光功率波动。3种可见光通信系统中,基于HPSA优化的IRS辅助VLC系统的平均接收光功率最大。此外,上述3种VLC系统采用混合型布局的平均均方时延拓展性能均优于矩形布局。研究工作对室内可见光通信系统光源分布研究具有一定参考价值。Aiming at the problem of unevenness of optical power distribution on the receiving plane in a visible light communication(VLC)system,a light source optimization method for an intelligent reflecting surface(IRS)-assisted indoor VLC system based on the hybrid particle swarm algorithm(HPSA)is proposed.Taking the two layout schemes of rectangular and hybrid arrangements with 16 light-emitting diodes(LEDs)as examples,the variance of received optical power on the receiving plane is set as the fitness function,and the proposed HPSA is combined with the IRS technology to optimize the half-power angle and positional layout of LEDs as well as the yaw and roll angles of IRS.Subsequently,initial(unoptimized)optimization using the HPSA,and optimization using the HPSA for the IRS-aided VLC systems are simulated and compared.The results indicate that when considering the first reflection link,compared to the original VLC system,the fluctuations of received optical power and signal-to-noise ratio of the VLC system optimized with the HPSA significantly decrease for both light source layouts;the HPSA optimized IRS-aided indoor VLC system improves the received optical power fluctuations in the rectangular layout as well as the HPSA optimized VLC system,and its performance is significantly better than that of the HPSA optimized VLC system only in the hybrid layout for optical power fluctuations improvement.Among the three VLC systems,the IRS-aided VLC system based on HPSA optimization has the largest average received optical power.Besides,the average root mean square delay spread performance of the above three VLC systems using a hybrid layout is better than that of a rectangular layout.This work will benefit the study of light source distribution in indoor VLC systems.

关 键 词：可见光通信系统 发光二极管 光源优化 混合粒子群算法 智能反射面 接收光功率 信噪比 

分 类 号：TN92[电子电信—通信与信息系统]