室内可见光通信LED布局研究与性能分析

Study of LED layout in indoor visible light communication and performance analysis

发光二极管(LED)的布局对于维持接收平面上光功率分布的稳定起着重要的作用,针对现有矩形LED布局接收功率分布存在盲区,影响可见光通信系统的性能的问题,文章根据照度均方差最小原则,设计了一种LED的圆形布局方案。通过对接收光功率分布、信噪比的分布进行仿真,研究了圆形布局和矩形布局方案。结果表明,在LED数量相同的情况下,非视距链路接收的功率分布优于视距链路的接收功率分布,但墙面反射降低了信噪比降。同时,圆形布局增强了房间角落处的接收功率,且圆形布局的信噪比波动小于矩形布局。文章的结果为室内可见光通信系统光源布局的研究提供了一种新的思路,同时为未来室内可见光通信链路的建立提供参考。

The layout of light emitting diodes(LED) plays an important role in maintaining a steady optical power distribution over the receiving plane. Aiming at the problem that the current Rectangular LED layout has a blind area in the receiving power distribution, which affects the performance of visible lightcommunicationsystem.This paper design a circular layout scheme of LED based on the criterion of the? illumination minimum mean square deviation. Circular layout and rectangular layout are analyzed through simulation of the received optical power distribution,signal noise ratio distribution in non line of sight(including the wall reflection)and line of sight(not including the wall reflection),when the number of the LED is different. It is clear from the results that the received optical power distribution of non line of sight is better than line of sight,when the number of the LED are same,but the signal noise ratio distribution is decreased result of the reflection of the wall. At the same time, the circular layout enhances the receiving power in the corner of the room, and the fluctuation of signal-to-noise ratio of the circular layout is less than that of the rectangular layout. The results of this paper provide a new idea for the research of the light source layout of indoor visible light communication system and a reference for the establishment of indoor visible light communication link in the future.