基于室内非定向的可见光通信系统的朗伯光源阶数优化

Optimisation of Lambertian Order for Indoor Visible Light Communication System

研究了一个基于室内非定向视距的可见光通信系统的发光二极管(LEDs)的朗伯光源阶数优化。从一个传统的朗伯体LED模型中得到一个关于朗伯阶数优化的表达式,分析室内多发射端的非定向视距可见光通信信道特性,包括光功率的分布以及配置单个和四个发射端情况下的多径时散,并通过仿真信道频率响应来估算传输带宽。仿真研究结果表明,利用朗伯阶数优化可以显著提升室内非定向视距光无线通信系统的传输带宽,尤其是对于具有多发射端配置的系统。

The optimized Lambertian order（OLO） of light-emitting diodes （LEDs） for an indoor nondirected line-of-sight visible-light communication（NLOS-VLC） systems is studied. An expression of the OLO is derived from a conventional Lambertian LED model, and then the indoor multi-cell NLOS-VLC channel characteristics including optical power distribution and muhipath time dispersion for two cases of one-cell and four-cell configurations are analyzed. In addition, the transmission bandwidth is estimated by simulating the channel frequency response. Simulation results indicate that, by using OLO a significant improvement on the transmission bandwidth can be achieved for indoor NLOS-VLC systems, in particular, for muhi-cell configurations.