University of Worcester Worcester Research and Publications

Li-Pos: A Light Positioning Framework Leveraging OFDM for Visible Light Communication

Wu, J., Ahmed Haider, Sami, Irshad, M., Arshad, J., Nomad, S.M. and Murthy, A. (2021) Li-Pos: A Light Positioning Framework Leveraging OFDM for Visible Light Communication. Sensors, 21 (13). p. 4310. ISSN 1424-8220

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The design of solid-state lighting is vital, as numerous metrics are involved in their exact positioning, and as it is utilized in various processes, ranging from intelligent buildings to the internet of things (IoT). This work aims to determine the power and delay spread from the light source to the receiver plane. The positions of the light source and receiver were used for power estimation. We focus on analog orthogonal frequency-division multiplexing (OFDM) in visible light communication (VLC) and assess the area under the curve (AUC). The proposed system was designed using modulation techniques (i.e., quadrature amplitude modulation; QAM) for visible light communication (VLC) and pulse-width modulation (PWM) for dimming sources. For the positioning and spreading of brightness, the proof-of-concept was weighted equally over the entire area. Therefore, the receiver plane was analyzed, in order to measure the power of each light-emitting diode (LED) in a given area, using the delayed mean square error (MSE). A framework was applied for the placement of LEDs, using full-width at half-maximum (FWHM) parameters with varying distances. Then, the received power was confirmed. The results show that the AUC using DRMS values for LEDs significantly increased (by 30%) when the number of source LEDs was changed from four to three. These results confirm that our system, associated with the simple linear lateration estimator, can achieve better energy consumption.

Item Type: Article
Additional Information:

This article belongs to the Special Issue Smartphone Sensors for Indoor Positioning.

A pdf file of this article is available to download from this WRaP record.

This is an open access article distributed under the
Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

Uncontrolled Discrete Keywords: visible light communication, full-width half maximum, positioning, power and delay spread, optical frequency division multiplexing
Divisions: College of Business, Psychology and Sport > Worcester Business School
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Copyright Info: Open Access article
Depositing User: Sami Ahmed Haider
Date Deposited: 06 Jul 2021 10:34
Last Modified: 06 Jul 2021 10:34

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