Abstract—This work introduces an enhanced optical wireless Line of Sight (LOS) indoor localization system based on Visible Light Communication (VLC) technology using Light-Emitting Diodes (LEDs) as optical sources. Although Received Signal Strength Indication (RSSI) localization algorithm is simple and needs no extra hardware to be installed, but its performance is poor at some received areas compared to Time Difference of Arrival (TDOA) technique. That is because RSSI technique depends on the received power strength which is degraded towards room corners. Therefore, the proposed system is a combination between RSSI and TDOA algorithms and the target position is estimated using RSSI only at places with acceptable received electrical power (1.04x10-8W or between 6.53x10-9 to 9.92x10-9W) while TDOA will be used at the other positions. Thus, this hybrid localization system will decrease the root mean-squared-error (RMSE) from 7.34cm using RSSI technique only on the whole received area to 5.81cm (using this hybrid system) and will save time. Some parameters that affect the performance of both RSSI and TDOA techniques are also included in this work in order to select the suitable values in the hybrid localization system. This work is evaluated by using MATLAB software version 2013.

 

Index Terms—Light-emitting diode, line of sight, visible light communications, radio frequency, received signal strength indication, root mean-squared-error, time difference of arrival

Cite: Marina Karmy, Shaimaa ElSayed, and Abdelhalim Zekry, "Performance Enhancement of an Indoor Localization System Based on Visible Light Communication Using RSSI / TDOA Hybrid Technique," Journal of Communications vol. 15, no. 5, pp. 379-389, May 2020. Doi: 10.12720/jcm.15.5.379-389

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