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Vol. 245, Issue 6, October 2020, pp. 57-64




Indoors Geolocation Based on Visible Light Communication

1, 2, * Paula Louro, 1, 2, 3 Manuela Vieira and 1, 2 Manuel Augusto Vieira

1 Electronics Telecommunication and Computer Dept. ISEL-IPL, R. Conselheiro Emídio Navarro, 1959-007 Lisboa, Portugal
2 CTS-UNINOVA, Quinta da Torre, Monte da Caparica, 2829-516, Caparica, Portugal
3 DEE-FCT-UNL, Quinta da Torre, Monte da Caparica, 2829-516, Caparica, Portugal
Tel.: + 351218317000, * E-mail: plouro@deetc.isel.ipl.pt


Received: 10 August 2020 /Accepted: 14 September 2020 /Published: 30 October 2020

Digital Sensors and Sensor Sysstems


Abstract: This paper presents the use of a selective device based on a- SiC:H/a-Si:H for the photodetection of visible signals emitted by red, green and blue emitters in a Visible Light Communication (VLC) system. The VLC system employs RGB white LEDs to provide both illumination and information transmission. The acquisition and processing of the measured photocurrent allows the identification of the induced optical excitation, which encodes the spatial position. The system is designed so that the detector’s s spatial location can be obtained based on the identification of the received optical signals. The methodology used for the photocurrent signal processing involves Fourier transform analysis for frequency identification and the use of a photodetector with spectral selective properties of wavelength identification. A full characterization of the photodetector is presented together with the physical operation that plays the key role in the detection of the output photocurrent.


Keywords: Visible Light Communication, Indoor navigation, Bidirectional Communication, Optical sensors, Transmitter/receiver, White LEDs, Amorphous SiC.


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