Performance improvement of color space based VLC modulation schemes under color and intensity variation

Abstract

Color space based modulation (CSBM) schemes have the potential to replace conventional intensity based modulation in visible-light communication (VLC) systems. This study attempts to address three major issues of the CSBM scheme in VLC systems, which are (1) performance improvement of CSBM as compared to conventional intensity based modulation, (2) intensity control, and (3) adaption to color variation. We improve the bit error rate (BER) performance of the CSBM scheme by incorporating an error boundary decision method. We analyze our proposed scheme by varying color during communication and introduce a color lookup table in order to obtain a more accurate target color at the receiver. We evaluate the CSBM scheme when the transmitter sends and does not send the target color information, and we also consider the effect of channel coding on the system performance. The computer simulation results, assuming an additive white Gaussian noise (AWGN) channel, demonstrate an uninterrupted communication system under intensity and color variation.