I. Introduction
Optical wireless communication (OWC) has become a promising technique to address the shortage issue of the spectrum resource in radio frequency (RF). Recently, Light emitting diode (LED) based visible light communication (VLC) has gained increasing attention, which achieves high-speed data transmission using power-efficient and cost-efficient LED light source [1]. Compared to OWC using Infrared (IR) or Ultra Violet (UV), LED-based VLC system can be used for communication and illumination at the same time [2].