Effects of Optical Beams on MIMO Visible Light Communication Channel Characteristics

Jupeng Ding,Chih-Lin I,Jintao Wang,Hui Yang

doi:10.3390/s22010216

Abstract

Under 5G envision, for pushing visible light communication (VLC) channel model evolution to various non-Lambertian beams, this paper introduces the typical commercial non-Lambertian beams, such as Luxeon rebel and side emitter, into the conventional analytical VLC channel model. The numerical results illustrate that the non-Lambertian beams can significantly affect the VLC channel frequency response characteristics. Compared with the traditional Lambertian beam, Side Emitter optical beam could naturally bring up to about 56.8% VLC multi input multi output channel capacity deviation, which objectively opens a new discussion dimension for enhancing VLC transmission performance.

Highlights

For satisfying the explosive traffic in the evolving 5G and coming 6G era, some countries have initiated relevant research activities
It should be noted that the current visible light communications (VLC) research is almost based on Lambertian light emitting diodes (LED) assumption [3,4,5,6]
For the first time, the VLC analytical models are derived for two typical non-Lambertian optical beams

Summary

Introduction

For satisfying the explosive traffic in the evolving 5G and coming 6G era, some countries have initiated relevant research activities. It should be noted that there are many potential VLC application scenarios adopting LED sources following non-Lambertian beam characteristics. For the first time, the VLC analytical models are derived for two typical non-Lambertian optical beams. The strength of the two Gaussian terms is linked to the basic components of LED source (chip, mirror and lens) This nonLambertian beam is still rotationally symmetric, the concerned direction of maximum radiation intensity obviously deviates the normal direction of the source, which means that more optical power is emitted to the coverage edge area [7,8]. Under Lambertian optical beam configuration, the whole channel frequency response could be written as HLam( f ; VLC

Non-Lambertian VLC Channel Model

Non-Lambertian MIMO Channel Capacity

Numerical Analysis

Findings

Conclusions