Study of RSS-Based Indoor Positioning System for Target Using Visible Light Communication
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Abstract
An optical wireless positioning system that uses white light-emitting diodes (LEDs) based on Visible Light Communication (VLC) is presented in this paper. In the proposed system, four LEDs are employed for illumination and communication. The trilateration technique is used for determining the receiver's location and the practical Received Signal Strength (RSS) measurements are used for distance estimation. The impact of ambient light on Signal-to-Noise-Ratio (SNR) is studied by taking into consideration the first-order light reflection off of the ceiling, floor, and walls for channel modeling with both direct and indirect sunlight exposure. A modeling equation from the RSS measurements is proposed. The results show that the illuminance in all of the places in the room can be satisfied. Furthermore, the average positioning error by adopting the derived equation and trilateration technique was an error of less than 3 cm.
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