LED兼具照明和数据通信功能,在室内可见光通信(VLC)中,LED的布局对维持接收面上接收功率的稳定分布有重要作用。室内LED矩形布局下的接收功率分布并不能覆盖整个接收面,存在接收功率中断区,无法实现最优的VLC系统性能。考虑室内墙面及地板的一次反射,研究LED在不同位置的布局方案,采用粒子群优化(PSO)算法分析LED布局方案,设计了能耗最小的LED圆形布局方案。仿真分析了LED矩形布局和圆形布局下的接收功率分布、信号中断率、能量损耗以及信噪比分布,仿真结果表明LED圆形布局的VLC系统性能优于矩形布局,需要的LED数量几乎为矩形布局的一半,减小了VLC系统的码间干扰。

LED can provide both illumination and data communication in indoor visible light communication (VLC). LED layout plays an important role in maintaining stable optical power distribution on receiving plane. LED rectangular layout can not provide a full coverage on the receiving plane in which receiving optical power interruption area exists, and can not achieve optimal performance of VLC system. Layouts of LED at different positions considering the first reflection of each wall and floor are studied. LED layouts are analyzed by particle swarm optimization (PSO) algorithm, and a LED circular layout with optimal energy consumption is designed. Rectangular layout and circular layout of LEDs are analyzed through simulation of the received optical power distribution, signal interruption rate, energy consumption and signal noise ratio distribution. The results show that, for the VLC system, the performance of the LED circular layout is better than that of the LED rectangular layout, and the LED circular layout can reduce the inter symbol interference with almost half number of LEDs used in the LED rectangular layout.