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Sensors 2017, 17(7), 1561; https://doi.org/10.3390/s17071561

Experimental Characterization of Close-Emitter Interference in an Optical Camera Communication System

1
Facultad de Ingeniería en Electricidad y Computación, Escuela Superior Politécnica del Litoral (ESPOL), Campus Gustavo Galindo Km 30.5 Vía Perimetral, P.O. Box 09-01-5863 Guayaquil, Ecuador
2
Institute for Technological Development and Innovation in Communications (IDeTIC), ULPG, Las Palmas 35001, Spain
3
Instituto de Oceanografía y Cambio Global (IOCAG), ULPG, Las Palmas 35214, Spain
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 22 June 2017 / Revised: 30 June 2017 / Accepted: 30 June 2017 / Published: 4 July 2017

Abstract

Due to the massive insertion of embedded cameras in a wide variety of devices and the generalized use of LED lamps, Optical Camera Communication (OCC) has been proposed as a practical solution for future Internet of Things (IoT) and smart cities applications. Influence of mobility, weather conditions, solar radiation interference, and external light sources over Visible Light Communication (VLC) schemes have been addressed in previous works. Some authors have studied the spatial intersymbol interference from close emitters within an OCC system; however, it has not been characterized or measured in function of the different transmitted wavelengths. In this work, this interference has been experimentally characterized and the Normalized Power Signal to Interference Ratio (NPSIR) for easily determining the interference in other implementations, independently of the selected system devices, has been also proposed. A set of experiments in a darkroom, working with RGB multi-LED transmitters and a general purpose camera, were performed in order to obtain the NPSIR values and to validate the deduced equations for 2D pixel representation of real distances. These parameters were used in the simulation of a wireless sensor network scenario in a small office, where the Bit Error Rate (BER) of the communication link was calculated. The experiments show that the interference of other close emitters in terms of the distance and the used wavelength can be easily determined with the NPSIR. Finally, the simulation validates the applicability of the deduced equations for scaling the initial results into real scenarios. View Full-Text
Keywords: Optical Camera Communication (OCC); Interference; Normalized Power Signal to Interference Ratio (NPSIR); Wireless Sensor Networks (WSN) Optical Camera Communication (OCC); Interference; Normalized Power Signal to Interference Ratio (NPSIR); Wireless Sensor Networks (WSN)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Chavez-Burbano, P.; Guerra, V.; Rabadan, J.; Rodríguez-Esparragón, D.; Perez-Jimenez, R. Experimental Characterization of Close-Emitter Interference in an Optical Camera Communication System. Sensors 2017, 17, 1561.

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