Institute for Technological Development and Innovation in Communications IDeTIC

Spain

Institute for Technological Development and Innovation in Communications IDeTIC

Spain
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Chavez-Burbano P.,ESPOL Polytechnic University | Guerra V.,Institute for Technological Development and Innovation in Communications IDeTIC | Rabadan J.,Institute for Technological Development and Innovation in Communications IDeTIC | Rodriguez-Esparragon D.,Institute Oceanografia y Cambio Global IOCAG | Perez-Jimenez R.,Institute for Technological Development and Innovation in Communications IDeTIC
Sensors (Switzerland) | Year: 2017

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. © 2017 by the authors. licensee MDPI, Basel, Switzerland.


Quintana C.,Institute for Technological Development and Innovation in Communications IDeTIC | Guerra V.,Institute for Technological Development and Innovation in Communications IDeTIC | Rufo J.,Institute for Technological Development and Innovation in Communications IDeTIC | Rabadan J.,Institute for Technological Development and Innovation in Communications IDeTIC | Perez-Jimenez R.,Institute for Technological Development and Innovation in Communications IDeTIC
IEEE Transactions on Consumer Electronics | Year: 2013

This paper explores the use of a reading lamp as an access point for a Visible Light Communications (VLC) downlink channel. We have established an infrared uplink channel based on a network adapter, supporting both a VLC receiver and an infrared emitter. The optical signal power distribution over the passenger area has been also studied using a Monte Carlo Ray-Tracing algorithm. The hardware implementation and testing results are also presented.1 © 1975-2011 IEEE.

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