An Indoor Visible Light Positioning System Using Tilted LEDs with High Accuracy

Neha Chaudhary*, Othman Younus, Luis Nero Alves, Fary Ghassemlooy, Stan Zvanovec, Hoa Le-Minh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)
35 Downloads (Pure)


The accuracy of the received signal strength-based visible light positioning (VLP) system in indoor applications is constrained by the tilt angles of transmitters (Txs) and receivers as well as multipath reflections. In this paper, for the first time, we show that tilting the Tx can be beneficial in VLP systems considering both line of sight (LoS) and non-line of sight transmission paths. With the Txs oriented towards the center of the receiving plane (i.e., the pointing center F), the received power level is maximized due to the LoS components on F. We also show that the proposed scheme offers a significant accuracy improvement of up to ~66% compared with a typical non-tilted Tx VLP at a dedicated location within a room using a low complex linear least square algorithm with polynomial regression. The effect of tilting the Tx on the lighting uniformity is also investigated and results proved that the uniformity achieved complies with the European Standard EN 12464-1. Furthermore, we show that the accuracy of VLP can be further enhanced with a minimum positioning error of 8 mm by changing the height of F.
Original languageEnglish
Article number920
Number of pages16
Issue number3
Publication statusPublished - 29 Jan 2021


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