A VLC-based robust ID broadcasting indoor location system for mobile devices

摘要

In this paper, a low cost ID broadcasting indoor location system using visible light communication (VLC) on a mobile device is proposed. Each LED lamp is given a different ID, corresponding to a location in the map stored in the Android App. LED lamps broadcasts its ID using on-off keying (OOK) modulation and BCH (Bose-Chaudhuri-Hocquenghem) coding so that a mobile device with a photodiode (PD) can receive the ID. When an ID is received, the application knows where the device (the user) is by searching the map. Detailed description of the transmitter circuit, the encoder and the decoder are discussed. Experiments show that the ID can be correctly decoded on the receiver side within 40 milliseconds on average. Accurate location can be achieved for up to 54 meters range.