Improving performance of 750-Mb//s visible light commun- ication system using adaptive Nyquist windowing

We propose a configuration of a wavelength division multiplexing(WDM)-visible light communication(VLC) system using orthogonal frequency division multiplexing(OFDM) modulation and an adaptive Nyquist windowing of the OFDM signal in the receiver.Based on this configuration,we demonstrate a 750-Mb/s WDM-VLC transmission based on RGB light-emitting diode(LED) with a distance of 70 cm.The measured bit error rate(BER) for all channels are under the pre-forward error correction limit of 3.8×10 3.The BER performances of all the channels of the proposed WDM-VLC system show considerable improvement compared with those of the system without Nyquist windowing.