Maximization of Visible Light Communication Capacity Employing Quasi-Linear Preequalization with Peak Power Limitation

Yingjun Zhou,Nan Chi,Jianyang Shi,Zhixin Wang,Xingxing Huang,Junwen Zhang

doi:10.1155/2016/6902152

Abstract

We propose quasi-linear preequalization to be used for high speed visible light communication (VLC) system. Compared with zero-forcing preequalization, this kind of preequalization method is more suitable for a real VLC experimental system with peak power limitation. We carry out simulations and experiments to test the performance of quasi-linear preequalization. With this equalizer, the 3 dB bandwidth of the system can be extended from 17 MHz to 450 MHz. We implement 2.32 Gbit/s phosphorescent white light-emitting diode (LED) VLC transmission over 1 m distance with quasi-linear equalizer, bit and power loading OFDM, differential amplification positive intrinsic negative diode (PIN) receivers, and maximum ratio combining algorithm. To our knowledge, this is the highest transmission data rate based on a phosphorescent white LED VLC system.

Highlights

With the advantage of combining lighting and communication, visible light communication (VLC) has become more and more attractive
Frequency Receiving signal utilizing a phosphorescent white lightemitting diode (LED) over 1 m free space transmission distance with bit error rate (BER) lower than 3.8 × 10−3. This is the highest transmission data rate based on a phosphorescent white LED VLC system
The convex kind implements the highest experimental data rate 2.32 Gb/s over 1 m distance when k = 0.1 with BER lower than 3.8 × 10−3

Summary

Introduction

With the advantage of combining lighting and communication, VLC has become more and more attractive. Compared with other wireless communication technologies, VLC is preferred due to its low cost, high accuracy, high security, immunity to electromagnetic interference, and long life [1,2,3,4]. The key challenge in high speed VLC system based on commercial phosphorescent white LEDs is the limited bandwidth from 3 MHz to 20 MHz [5, 6]. Many approaches such as preequalization and high order modulation have been applied in VLC system for higher modulation bandwidth of LEDs and higher transmission data rate. Compared with RGB LEDs, phosphorescent white LEDs are more promising because of its low cost and complexity

Methods

Results

Conclusion