Road-to-vehicle communication using LED traffic light

We propose a parallel wireless optical communication system for road-to-vehicle communication, which uses a LED traffic light as a transmitter and a high-speed camera as a receiver. The newly proposed system which enables multichanneling in LED two dimension arrangement and spatially dividing them. LED transmitters arranged in the shape of a plane are modulated individually, and a camera is used as a receiver for demodulating the signals by using image processing techniques. We performed examination of the transmission speed according to the proposed system in this paper. The actual proof experiment of the proposed system was conducted under the laboratory conditions. We checked that it communicates with a speed of 2.78kbps while 192 LED are spatially divided into eight groups and the high-speed camera set to 500fps.