A New Color Space Based Constellation Diagram and Modulation Scheme for Color Independent VLC

Advances in Electrical and Computer Engineering

关键词: constellation diagram;    gcm;    light color space;    mapping and demapping;    visible light communication;   

DOI  :  10.4316/AECE.2012.04002

来源: DOAJ

【 摘 要 】

In this paper, generation of a constellation diagram, data to light intensity mapping, and light intensityto data demapping are introduced for the visible light communication (VLC) systems. We propose a newconstellation diagram and modulation scheme named generalized color modulation (GCM) based on lightcolor space which can be uniquely applied to modulate the light signals used to deliver data informationregardless of target colors of VLC signals. At first, we describe the generation of a constellation ina light color space considering the target color of VLC signals. Then we represent the data symbolsas constellation points, resulting in every data symbol having a specific position and correspondingcolor in the light color space. After that, we determine the position of received signal points in thelight color space at the receiver by manipulating the intensities of received signals from the photodetectors. Finally, we convert these received points to data symbols by matching them to the constellationpoints generated by the receiver. We consider both single color and multiple colors scenarios and investigatetwo cases to obtain the color information at the receiver. Simulation results show that our proposed schemecan be applied to the development of a more efficient VLC system.

【 授权许可】

Unknown