中国激光, 2018, 45 (5): 0506002, 网络出版: 2018-05-21
室内可见光通信系统光源LED布局优化与性能分析 下载: 787次
LED Layout Optimization and Performance Analysis of Indoor Visible Light Communication System
光通信 室内 可见光通信 照度均方差 发光二极管 矩形布局 圆形布局 optical communications indoor visible light communication mean square error of illumination light emitting diodes rectangular layout circular layout
摘要
在室内可见光通信系统(VLC)中,为解决传统光源布局方式中因照度分布不均匀而存在通信盲区的问题,提出考虑墙面反射的光源LED优化方案。以照度均方差作为评价标准分析LED布局,通过积分推导出接收面照度和功率的表达式,构建了矩形布局优化模型函数F(l,x,y)和圆形布局优化模型函数F(r,x,y),并根据优化函数研究了照度均方差与房间尺寸、最佳布局与视场角的关系。仿真结果表明:LED矩形布局光源的位置存在最优点l=1.6 m,视场角为ψFOV=80°,照度均匀性由传统布局的80.5%提升到84.3%;圆形布局光源的位置存在最优半径r=2 m,视场角为ψFOV=80°,当LED位于最优点半径时,圆形布局的照度均匀性随着光源LED数量的增加由85.2%增加到89.2%。
Abstract
The traditional LED layout has the problem of uneven illumination in indoor visible light communication(VLC) system, which brings blind effect with communication. To solve these problems, we propose a light source LED optimization scheme that considers wall reflections and analyze LED layout by using the mean square error of illumination as evaluation criterion. Then, the expressions of received illumination and power are deduced by integrating, which are used to build optimization model function F(l,x,y) of rectangular layout and optimization model function F(r,x,y) of circular layout. The relationships between the mean square error of illumination and the room size, and between the optimal layout and field of view ψFOV are researched based on optimization model function. It is clear from the results that the F(l,x,y) can reach the minimum value when l=1.6 m and ψFOV=80°, and the illumination uniformity is increased from 80.5% of traditional layout to 84.3%; the F(r,x,y) could also obtain the minimum value when r=2 m and ψFOV=80°, and the illumination uniformity is increased from 85.2% to 89.2% with the increase of the number of LED.
王加安, 车英, 郭林炀, 王馨兰. 室内可见光通信系统光源LED布局优化与性能分析[J]. 中国激光, 2018, 45(5): 0506002. Wang Jiaan, Che Ying, Guo Linyang, Wang Xinlan. LED Layout Optimization and Performance Analysis of Indoor Visible Light Communication System[J]. Chinese Journal of Lasers, 2018, 45(5): 0506002.