基于白光发光二极管的室内可见光通信光源布局优化  

Optimization of Light Source Layout in Indoor Visible Light Communication Based on White Light-Emitting Diode

作　　者：赵黎[1] 彭恺[1] 

机构地区：[1]西安工业大学电子信息工程学院,陕西西安710032

出　　处：《光学学报》2017年第7期41-49,共9页Acta Optica Sinica

基　　金：国家自然科学基金(61671362;61271362);陕西省科技厅自然基金(2012JQ8008);陕西省教育厅科技专项(2012JK0545);西安市科技计划[CXY1341(3)]

摘　　要：传统基于照明的光源布局方式在室内难免会存在光照度不均匀现象,造成通信盲区效应,从而影响通信系统的可靠性。为了解决此问题,以4m×4m×3m房间为模型,在常用的室内光源布局模式下,采用光照度补偿技术,对其进行合理的布局优化,得出了一种由5个发光二极管阵列组成的光源布局方式,这种布局方式可同时降低系统功耗并提高光照度均匀性。为了兼顾可见光通信(VLC)系统的可靠性,采用室内接收平面的光照度标准差与通信中接收平面的平均误码率(BER)构建系统优化模型函数f(L,i),当f(L,i)达到最小值时可同时满足接收平面的照度要求和通信BER要求。仿真结果表明,当L=0.35m、i=0.025m时,f(L,i)取最小值,此时接收平面光照度的最小值为301.26lx,最大值为389.90lx,均匀度为93.24%,系统照度标准差为20.1,功耗为140.5 W,BER为6.39×10-7。所提系统可同时兼顾室内接收平面光照度分布的均匀性和通信的可靠性,为室内VLC光源布局提供了一种优化方法。The illumination based traditional source layout has the problem of uneven illumination,which results in blind effect of communication and greatly affects the reliability of communication system.In order to solve these problems,a 4m×4m×3mroom is taken as the model,and the illumination compensation technology is used in the common indoor light source layout to optimize the layout.A kind of light source layout which is composed of five light-emitting diode arrays is obtained.With this kind of layout,the power consumption of the system can be reduced,and at the same time the uniformity of illumination can be improved.In order to balance the reliability of visible light communication（VLC）system,the indoor illumination standard deviation and the average bit error rate（BER）on receiving plane in communication system are used to build a system optimization model function f（L,i）.When f（L,i）reaches the minimum value,it can meet the requirements of the receiving plane illumination and the BER.The simulation results show that the f（L,i）can reach the minimum value when L=0.35 m and i=0.025 m.For the receiving plane,the minimum illumination value is 301.26 lx,the maximum illumination value is 389.90 lx,and the illumination uniformity is 93.24%.At the same time,the illumination standard deviation is 20.1,the power consumption is 140.5 W,and the BER is 6.39×10^-7.The proposed system takes the uniformity of indoor illumination distribution on receiving plane and the communication reliability into account,which provides an optimization method for the light source layout of indoor VLC.

关 键 词：光通信 可见光通信 光源布局 照度补偿 发光二极管阵列 误码率 

分 类 号：TN929.1[电子电信—通信与信息系统]