Mitigation of illumination interference caused by PWM dimming in OFDM based visible light communication systems

Author

Kizilirmak, Refik Caglar ; Yau Hee Kho

Author_Institution

Dept. of Electr. & Electron. Eng., Nazarbayev Univ., Astana, Kazakhstan

fYear

2015

fDate

21-23 April 2015

Firstpage

489

Lastpage

492

Abstract

In this work, we propose a method to mitigate the interference caused by other light sources for OFDM based visible light communication systems. We consider two LED based light sources in the environment and assume only one of them is emitting information. When the second luminary is dimmed with pulse-width-modulation (PWM) method, the pulse transitions of the PWM signal emitted by the second luminary will disrupt the useful OFDM signal. The proposed interference mitigation technique can detect the pulse transition instances and recover the useful signal.

Keywords

OFDM modulation; light emitting diodes; light interference; light sources; optical communication; pulse width modulation; LED; OFDM signal; PWM dimming; PWM method; PWM signal; illumination interference; interference mitigation technique; light sources; pulse transition; pulse-width-modulation; second luminary; visible light communication systems; Interference; Light emitting diodes; OFDM; Optical pulses; Optical receivers; Pulse width modulation; DCO-OFDM; Interference; OFDM; PWM dimming; Visible light communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Computer, Communications, and Control Technology (I4CT), 2015 International Conference on

Conference_Location

Kuching

Type

conf

DOI

10.1109/I4CT.2015.7219626

Filename

7219626