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An annular light source layout model for both lighting and communication reliability
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摘要
传统基于阵列的光源布局方式在室内难免存在光照度及系统误码率不均匀现象，为提高系统照度均匀性及通信可靠性，需合理对光源进行优化布局。本文以4 m×4 m×3 m的房间为模型，设计了单LED阵列+灯带的环形光源布局模型。模型中间采用6×6 LED阵列，阵列内部灯珠之间的距离为0.3 m；四周采用环形灯带形式，灯珠个数为316个，灯珠之间的距离为0.05 m。仿真结果表明，该模式下系统光照度均值为437.08 lx，光照度均匀性为93.9%，同时，系统误码率均值为2.8716×10-7。因此，本文所设计的环形光源布局模型兼顾了室内光照度分布的均匀性和通信的可靠性，可同时满足室内照明和通信，为室内可见光通信光源布局提供了一种优化方法。
Abstract
The traditional layout of light source based on array will inevitably lead to uneven illumination and BER in the room. In order to improve the illumination uniformity and reliability of the system, it is necessary to optimize the layout of the light source reasonably. In this paper, a 4 m × 4 m × 3 m room is used as the model to design a ring light source layout model with a single-LED array and lamp belts. In this model, the distance between the inner lamps of the 6 × 6 LED array is 0.3 m. The number of surrounding lamp beads is 316 and the distance between the lamps is 0.05 m. The simulation results show that the system illumination is about 437.08 lx and the illumination uniformity is 93.9%. At the same time, the system error rate is about 2.8716×10-7.The annular light source layout model designed in this paper takes into account the uniformity of indoor illumination distribution and the reliability of communication simultaneously, which can meet the indoor lighting and communication at the same time and also can provide an optimization method for the layout of indoor visible light communication.
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Key words:
- visible light communication system /
- light intensity /
- bit error rate /
- shadow effect
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Overview
Overview: Indoor visible light communication technology is a new wireless data transmission method based on white light LED. With the rapid development of wireless transmission and the increasing tension of the current wireless spectrum resources, the research of visible light communication has become a research hotspot in the field of communication. The light source LED should take the dual functions of lighting and communication into consideration at the same time. In order to effectively ensure uniformity of lighting and the reliability of communication, a reasonable layout of the light source is needed to get a simple and beautiful layout structure and can effectively avoid the shadow effect and improve the uniformity of lighting and the reliability of communication. At present, there are many literatures on indoor illumination and visible light communication reliability at domestic and foreign, but most of them are based on the traditional array layout model that has the weaknesses of large illumination variance and uneven illumination distribution. In order to avoid these problems in traditional array layout model, a 4 m×4 m×3 m indoor model is adopted as the real space transport model to calculate the indoor illumination distribution and communication reliability, and a ring light source layout model with a single-LED array and lamp belts is designed based on the principle of illumination compensation. Through the numerical analyses of the minimum illumination and the uniformity of illumination under different layout parameters, it is concluded that the entire receiving plane illumination is between 300 lx~470 lx when the distance between the inner lamps of the 6 × 6 LED array is 0.3 m and the number of surrounding lamp beads with distance of 0.05 m is 316. Under this layout model, the maximum and minimum illuminations of the system are about 465.1 lx and 331.4 lx, respectively. Furthermore, the mean light intensity is about 437.0751 lx, and the uniformity of about 93.9% can be achieved. Compared with the traditional 4-LED array layout model, the illumination uniformity is increased by 4.54%. At the same time, the average BER of the annular light source model is about 2.8716×10-7 that is lower than that of the 4-LED array layout model. Therefore, the annular light source layout model designed in this paper can not only meet the uniformity of indoor illumination distribution but also ensure the reliability of communication, thus providing an effective layout method for indoor visible light communication.
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图 5 单个LED阵列+灯带在天花板上的分布
Figure 5. Distribution of the model with single-LED array and camp belts
图 6 不同i, i1取值时光照度最小值分布
Figure 6. The minimum value of light distribution with different values of i and i1
图 7 单个LED阵列+灯带模型的光照度分布图
Figure 7. The light distribution map of the model with a single-LED array and light belts
图 8 单个LED阵列+灯带模型的误码率分布图
Figure 8. Error rate distribution map of the model with a single-LED array and light belts
表 1 仿真参数
Table 1. Simulation parameters
参数 值 房间大小 4 m×4 m×3 m 单个LED功率Pt/W 0.5 LED灯半功率角φ/deg 60 LED的中心发光强度I(0)/cd 21.5 噪声带宽因子I1 0.562 系统数据传输速率Rb/(Mbit/s) 10 放大器噪声电流Ia/(${\rm{pA/}}\sqrt {{\rm{Hz}}} $) 5 放大器带宽Ba/MHz 50 背景光的噪声功率Pn/ mW 0.2 光电探测器转换效率R 0.4 
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