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International Journal of Antennas and Propagation
Volume 2014, Article ID 670930, 11 pages
http://dx.doi.org/10.1155/2014/670930
Research Article

Implementation of an Optical-Wireless Network with Spectrum Sensing and Dynamic Resource Allocation Using Optically Controlled Reconfigurable Antennas

1Laboratory WOCA (Wireless and Optical Convergent Access), National Institute of Telecommunications (Inatel), João de Camargo Avenue 510, 37540-000 Santa Rita do Sapucaí, MG, Brazil
2“NovaGenesis” Project, National Institute of Telecommunications (Inatel), João de Camargo Avenue 510, 37540-000 Santa Rita do Sapucaí, MG, Brazil
3Federal University of Itajubá (Unifei), Benedito Pereira dos Santos Avenue, 1303, 37500-903 Itajubá, MG, Brazil

Received 14 December 2013; Revised 14 February 2014; Accepted 22 February 2014; Published 30 April 2014

Academic Editor: Ali El-Hajj

Copyright © 2014 E. Raimundo-Neto et al. 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.

Abstract

This work proposes the concept and reports the implementation of an adaptive and cognitive radio over fiber architecture. It is aimed at dealing with the new demands for convergent networks by means of simultaneously providing the functionalities of multiband radiofrequency spectrum sensing, dynamic resource allocation, and centralized processing capability, as well as the use of optically controlled reconfigurable antennas and radio over fiber technology. The performance of this novel and innovative architecture has been evaluated in a geographically distributed optical-wireless network under real conditions and for different fiber lengths. Experimental results demonstrate reach extension of more than 40 times and an enhancement of more than 30 dB in the carrier to interference plus noise ratio parameter.