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Vol. 218, Issue 12, December 2017, pp. 32-39




A Fine-Grained Visible Light Communication Position Detection System

1, 2, 3 M. Vieira, 1, 2 M. A. Vieira, 1, 2 P. Louro, 1, 2 A. Fantoni and 1, 4 P. Vieira

1 ADETC/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
4 Instituto das Telecomunica
ções, Instituto Superior Técnico, 1049-001, Lisboa, Portugal
1 Tel.: +351218317000, fax: +351218317114

E-mail: mv@isel.ipl.pt


Received: 10 November 2017 /Accepted: 10 December 2017 /Published: 29 December 2017

Digital Sensors and Sensor Sysstems


Abstract: An indoor positioning system where trichromatic white Light Emitting Diodes (LEDs) are used both for illumination proposes and as transmitters and an optical processor, based on a-SiC:H technology, as mobile receiver is presented. On-Off Keying (OOK) modulation scheme is used, and it provides a good trade-off between system performance and implementation complexity. The relationship between the transmitted data and the received digital output levels is decoded. LED bulbs work as transmitters, sending information together with different identifiers, IDs, related to their physical locations. A triangular topology for the unit cell is analysed, and a 2D localization design, demonstrated by a prototype implementation, is presented. Fine- grained indoor localization is tested. The received signal is used in coded multiplexing techniques for supporting communications and navigation concomitantly on the same channel. The location and motion information is found by mapping the position and estimating the location areas.


Keywords: a-SiC: H technology, Optical sensor, Transmitter, Receiver, Demultiplexer, WDM, Indoor positioning.


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