Title :
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
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;
Conference_Titel :
Computer, Communications, and Control Technology (I4CT), 2015 International Conference on
Conference_Location :
Kuching
DOI :
10.1109/I4CT.2015.7219626
