Indoor Positioning System Based on Visible Light Communication with Gray-Coded Identification

Visible light communication (VLC), as a promising future wireless communication technology, has been considered as an attractive solution for indoor positioning systems. In this paper, a novel indoor visible light positioning system is proposed, where the Gray code is utilized for the positioning identification (ID). Compared with the existing light emitting diode (LED)-ID systems, the proposed scheme can deal with the overlapping area problem where the target receiver detects multiple positioning IDs from neighboring LED lamps. Furthermore, the alternating current in the power line is used for time synchronization to facilitate the indoor localization. Experimental demonstration are carried out to verify the feasibility of the proposed scheme, which shows that the proposed system can provide superior performance with large positioning range and low implementation complexity.