Visible light communication system based on multi-level pulse code modulation

In this paper, to improve the data transmission rate, visible light communication (VLC) system based on multi-level pulse code modulation (MPCM) is considered. This system uses different brightness level of the visible light signals to realize the multi-level modulation, thus a high data transmission rate, which is several times of that in 2-level modulation system, can be achieved. The overall design of the system is firstly considered. Then with 4-level modulation as an example, a set of system prototype is developed. Testing results of the prototype show that the system is reasonable and stable. Therefore, it is proved that applying the MPCM in VLC system is feasible and effective.