An evaluation of a parallel transmission visible light communication system employing an LDPC code

In this paper, we construct a prototype of a wireless visible light communication system using an LED matrix and an image sensor, and evaluate the performance by experiments. In order to increase a transmission rate, the transmitter is composed of plural LEDs and sends digital information by independently controlling brightness of them, which is called parallel transmissions. The receiver captures the state of the LEDs by using an image sensor and restores the information by image processing. In the parallel transmissions, since interference between LEDs causes performance degradation, we introduce an LDPC code to mitigate the influence of interference.