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ThinkMind // SENSORDEVICES 2018, The Ninth International Conference on Sensor Device Technologies and Applications // View article sensordevices_2018_7_30_20105


Navigation Cells Based on Visible Light Communication for Indoor Positioning

Authors:
Paula Louro
Manuela Vieira
Manuel Augusto Vieira

Keywords: amorphous SiC; optoelectronic; spectral sensitivity; white LEDs; visible light communication; indoor positioning

Abstract:
White Light emitting Diodes (LEDs) revolutionized the field of illumination technology mainly due to energy efficiency. Besides LEDs can also be used in wireless communication systems when integrated in Visible Light Communication (VLC) systems. Indoor positioning for navigation in large buildings using Global Positioning Service (GPS) systems is limited by signal attenuation. The motivation for this application is also supported by the possibility of taking advantage of an existing lighting and WiFi infrastructure. In this work, it is proposed an indoor navigation system based on the use of VLC technology. The proposed system includes tri-chromatic white LEDs with the red and blue chips modulated at different frequencies and a pin-pin photodetector with selective spectral sensitivity. Optoelectronic features of both optical sources and photodetector device are analyzed. The photodetector device consists two pin structures based on a-SiC:H and a-Si:H with geometrical configuration optimized for the detection of short and large wavelengths in the visible range. Its sensitivity is externally tuned by steady state optical bias. 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 was demonstrated through the implementation of an automatic algorithm to infer the photodetector cardinal direction.

Pages: 121 to 125

Copyright: Copyright (c) IARIA, 2018

Publication date: September 16, 2018

Published in: conference

ISSN: 2308-3514

ISBN: 978-1-61208-660-6

Location: Venice, Italy

Dates: from September 16, 2018 to September 20, 2018

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