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Proceedings Paper

Indoors positioning through VLC technology using an a-SiC:H photodetector
Author(s): P. Louro; J. Costa; M. Vieira; M. A. Vieira
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Paper Abstract

The work presented in this paper supports the viability of a navigation system based on Visible Light Communication (VLC) for indoors applications. The system design uses RGB LEDs and an a:SiC:H photodetector.

An optoelectronic characterization of the devices used in the integrated system is presented to support the main results, namely the decoding strategy. The photodetector is a pin-pin heterostructure that works as an optical filter, presenting a selective spectral sensitivity dependent on the external optical bias. The red and blue light emitted from the white RGB LEDs were modulated at different frequencies. With this configuration each cardinal direction becomes assigned to a specific set of optical excitation (wavelength and frequency). The decoding of the output photocurrent allows the identification of the input optical signals and the determination of the correspondent spatial direction. The localization algorithm makes use of the Fourier transform to identify the frequencies present in the photocurrent signal and the wavelength filtering properties of the sensor under front and back optical bias to detect the existing red and blue signals. The viability of the system is demonstrated through the implementation of an automatic algorithm to infer the photodetector cardinal direction. Additional research on the light intensity is presented to investigate the accuracy of the spatial position along a cardinal direction.

Paper Details

Date Published: 22 August 2017
PDF: 7 pages
Proc. SPIE 10453, Third International Conference on Applications of Optics and Photonics, 104530H (22 August 2017); doi: 10.1117/12.2271634
Show Author Affiliations
P. Louro, Instituto Superior de Engenharia de Lisboa (Portugal)
CTS-UNINOVA (Portugal)
J. Costa, Instituto Superior de Engenharia de Lisboa (Portugal)
CTS-UNINOVA (Portugal)
M. Vieira, Instituto Superior de Engenharia de Lisboa (Portugal)
CTS-UNINOVA (Portugal)
Univ. Nova de Lisboa (Portugal)
M. A. Vieira, Instituto Superior de Engenharia de Lisboa (Portugal)
CTS-UNINOVA (Portugal)


Published in SPIE Proceedings Vol. 10453:
Third International Conference on Applications of Optics and Photonics
Manuel Filipe P. C. M. Martins Costa, Editor(s)

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