采用改进遗传算法的可见光通信光源布局优化  

Optimization of Light Source Layout in Visible Light Communication Using a Modified Genetic Algorithm

作　　者：贺锋涛 余婕 张建磊 杨祎 杨雅伊 朱云周 王晓波 He Fengtao;Yu Jie;Zhang Jianlei;Yang Yi;Yang Yayi;Zhu Yunzhou;Wang Xiaobo(School of Electronic Engineering,Xi’an University of Posts and Telecommunications,Xi’an 710121,Shaanxi,China;Key Laboratory of Underwater Information and Control,China Shipbuilding Industry Corporation 705 Research Institute,Xi’an 710077,Shaanxi,China)

机构地区：[1]西安邮电大学电子工程学院,陕西西安710121 [2]中国船舶重工集团705研究所水下信息与控制重点实验室,陕西西安710077

出　　处：《中国激光》2023年第13期142-150,共9页Chinese Journal of Lasers

基　　金：装备预研教育部联合基金(8091B032130);陕西省微波光子与光通信创新团队资助专项(2021TD-09);水下信息与控制重点实验室资助项目(JCKY2021207CD02)。

摘　　要：为改善室内可见光通信中传统光源布局方式造成的接收光功率不均匀从而导致通信盲区的问题,本文提出了一种局部非均匀的对称型布局方式,并结合自适应机制及模拟退火算法对遗传算法中的选择、交叉和变异算子进行改进,在考虑墙面一次反射的情况下利用改进遗传算法对LED芯片位置、芯片上的灯珠数目及半功率角进行同步优化。仿真结果表明:在5 m×5 m×5 m的房间模型中,采用改进遗传算法对灯源布局进行优化后,接收光功率均匀度达到了97.7%,平均光功率为1029μW,光照均匀度达到了0.84。此外,利用改进的遗传算法针对不同尺寸房间模型中的灯源布局进行了优化,结果表明,接收光功率均匀度均得到了提高。Objective Visible light communication(VLC)technology is crucial in high-speed positioning,sensing,internet of things(IoT),and other fields because of its characteristics of high transmission rate,no band limit,safety,and eco-friendliness.With the development of VLC technology,indoor VLC technology has also received increased attention.The LED array is used as the transmitting unit in an indoor VLC system.However,the layout and parameters of a LED array affect the received illumination and optical power,thus changing the communication quality of receiving plane and affecting the fairness of user communication.Therefore,to solve the problem of uneven communication performance caused by conventional array layout,we propose a partialnonuniform symmetrical layout by using a modified genetic algorithm.Considering the primary reflection of the wall,the number of light beads on the chips,the half power angles,and array layouts that can further improve the received optical power uniformity are designed to synchronously optimize the position of LED chips.Methods In this study,by studying and summarizing the common LED array layouts used in indoor VLC systems worldwide,a partial-nonuniform symmetrical array layout scheme was developed.The scheme was used to optimize the position of LED chips,number of light beads on the chip,and half power angles of the partial array.Thus,the entire surface of emission was obtained by folding the optimized nonuniform part before the optical power uniformity of the receiving surface was calculated based on the optimized array layout scheme.Thereafter,the VLC model with either non-line of sight link(NLOS)or line of sight(LOS)link was constructed.In addition,the crossover and variation operators in a genetic algorithm(GA)were modified via combination with the simulated annealing algorithm and self-adaption.Based on the LOS link and NLOS link models,an objective function that can synchronously optimize the position of LED chips,the number of light beads on the chip,and the half power angles was

关 键 词：光通信 可见光通信 遗传算法 光源布局 接收光功率 

分 类 号：TN92[电子电信—通信与信息系统]