Photo Detector Based Indoor Positioning Systems Variants

Indoor positioning systems (IPS) using photo detector at receiving end is revealed. In first part an overview of the Visible Light Communication technology (VLC) is presented. Second part of this paper briefs the VLC channel model and its basic parameters and their effect in light propagation. In third portion the LED based positioning algorithms are discussed in details and further protocols are investigated that are used for position calculation from the signals calculated from different techniques. In next section the types of different photo detector based positioning systems are discussed and after that the metrics are discussed on the basis of which the table is drawn providing a comparison of different IPSs systems. Before conclusion some future challenges in this field are given for researchers to enhance VLC based systems.