Background Optical Noises Circumvention in LED Optical Wireless Systems Using OFDM

Author

Chow, C.W. ; Yeh, C.H. ; Liu, Y.F. ; Huang, P.Y.

Author_Institution

$^{1}$ Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu, Taiwan

Volume

5

Issue

2

fYear

2013

fDate

Apr-13

Firstpage

7900709

Lastpage

7900709

Abstract

Background optical noises generated by the conventional fluorescent light sources or AC-power light-emitting diode (LED) can significantly affect the performance of the LED optical wireless communication and produce challenges to implementation. We demonstrate using orthogonal frequency division multiplexing (OFDM) to effectively circumvent the optical background noises. Besides, by using simple equalization at the receiver side, the transmission capacity can be extended from 1 Mb/s to 12 Mb/s. The theory and analysis of the equalization are presented. Experiments at different data rates and different OFDM subcarriers are preformed, and results show that, by adjusting the number of OFDM subcarriers, the influence of the background optical noises can be significantly circumvented.

Keywords

Light emitting diodes; OFDM; Optical fiber communication; Optical noise; Signal to noise ratio; Wireless communication; Free space communication; light-emitting diode (LED); noise mitigation; optical communications;

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2013.2258663

Filename

6510567