Implementation of differentiated services in indoor visible-light communication using interchannel interference

To facilitate differentiated services in visible-light communication systems, we propose an authorization method in the physical layer using interchannel interference based on polarization division multiplexing and a newly proposed signal-mapping process. The proposed system experimentally demonstrated that a 100-Mbit/s broadcasting signal transmission for a lower class user and two types of 100-MBd signal transmission for different higher class groups could be simultaneously enabled using pulse-amplitude modulation. Analysis of the performance of the lower and higher class signals' according to the polarization state of the receiver and the transmitted signal power imbalance is discussed. The proposed authorization method in the physical layer can be applied to many areas because classes can be subdivided when the number of channels increases by using wavelength division multiplexing. Furthermore, the ratio between the lower and higher class signals can be controlled in accordance with the environment.