High Speed Visible Light Communication Using Digital Power Domain Multiplexing of Orthogonal Frequency Division Multiplexed (OFDM) Signals

Wahyu-Hendra Gunawan,Chi-Wai Chow,Yang Liu,Chien-Hung Yeh,Yun-Han Chang

doi:10.3390/photonics8110500

Abstract

In order to increase transmission capacity, multiplexing schemes in different physical dimensions, including time, frequency, modulation quadrature, polarization, and space, can be employed. In this work, we propose and demonstrate a red color laser-diode (LD) based visible-light-communication (VLC) system using two kinds of digital domain multiplexing schemes, orthogonal-frequency-division-multiplexing (OFDM) and power-domain division-multiplexing (PowDM). The two digital domain multiplexed data can achieve data rates of 1.66 Gbit/s and 6.41 Gbit/s, respectively, providing a total data rate of 8.07 Gbit/s, fulfilling the pre-forward error correction (pre-FEC) bit-error-rate (BER) limit. The measured signal-to-noise ratios (SNRs) are 10.96 dB and 14.45 dB, respectively. Here, similar to OFDM, the PowDM can enhance the total system capacity by allowing acceptable signal spectra overlapping among different power division signals to maximize the bandwidth utilization. An experiment to verify and evaluate the proposed work is performed. The modulation and demodulation of OFDM and PowDM are discussed. The optimum power levels of the individual signals in the PowDM signal are also analyzed.

Highlights

Visible light communication (VLC) is an attractive and promising technology for future wireless communication systems [1]
Due to the advances of light emitting diode (LED) development, VLC systems can be based on existing lighting infrastructure to provide illumination and communication at the same time [2]
Due to the highly directional feature of the optical light beam, VLC could provide highly directional and high privacy transmission, at the same time being immune to radio-frequency (RF) electromagnetic interference (EMI) [3]

Summary

Introduction

Visible light communication (VLC) is an attractive and promising technology for future wireless communication systems [1]. A phosphor-based LED Tx for both lighting and VLC has been reported [13]. As the data rate of the LED based VLC system is limited by the relaxation time of the yellow phosphor, schemes include pre/postequalization [14], multiple-input multiple-output (MIMO) [15], etc.

Results

Conclusion