A visible-light communication system using optical CDMA with RGB multi-chip LEDs

White light-emitting diodes (LEDs) are attracting attention as a light source in developing a visible-light communication system. Optical code division multiple access (CDMA) is one of the solutions to transmit several data streams simultaneously in the system. We propose a visible-light communication system using optical CDMA with red-green-blue (RGB) multichip LEDs. The proposed method has advantages of reducing the number of LEDs since each multi-chip device includes three light sources and of cancelling multi-user interferences without using colored filters. Computer simulation shows the validity of the proposed scheme.