Abstract:

In this paper, the effect of light emitting diode (LED) deployment is investigated based on the received signal strength indication (RSSI) technique for visible light positioning (VLP) systems. The optical code division multiple access (OCDMA) is used as a multiplexing technique to transmit the location and RSSI information of LEDs simultaneously. For different highly reflective indoor scenarios, LEDs are placed on the ceiling of a room considering homogeneous illumination. The illuminance of the room is provided particularly with 400 lux minimally at the desk height. In order to demonstrate the uniformity of lighting for different indoor scenarios, the uniformity illuminance ratio (UIR) values are also obtained in this study. In addition, electrical signal-to-noise ratio (SNR), an important parameter for reliable communication, is calculated at desk height for each scenario considered and an SNR level of 45 dB is obtained at a minimum. The simulation results demonstrate that the mean square error (MSE) of the estimated location is reduced with an increase in the number of visible access points (VAPs). The MSE of the distance for number of VAPs 12 and 16 are the best, however, the scenario with 16 VAPs is preferable with a better uniformity illuminance ratio (UIR) parameter. In terms of illuminance, all the cases have the average illuminance value more than 450 lux.

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