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International Journal of Digital Multimedia Broadcasting
Volume 2015, Article ID 319387, 8 pages
http://dx.doi.org/10.1155/2015/319387
Research Article

On the Feasibility of Unlicensed Communications in the TV White Space: Field Measurements in the UHF Band

1Cagliari Research Unit, Italian University Consortium for Telecommunications, 09123 Cagliari, Italy
2Department of Electronics & Computers, Transilvania University of Brașov, 500019 Brașov, Romania
3Department of Electrical and Electronic Engineering, University of Cagliari, 09123 Cagliari, Italy
4Department of Communications Engineering, UPV/EHU, Alda Urkijo S/N, 48013 Bilbao, Spain

Received 29 September 2014; Revised 20 January 2015; Accepted 3 February 2015

Academic Editor: Jintao Wang

Copyright © 2015 M. Fadda 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

In practical unlicensed communications in TV band, radio devices have to identify, at first, the transmission opportunities, that is, the portion of the spectrum licensed for broadcasting services unoccupied in a certain region at certain time, that is, the so-called TV white space. In this paper the outcome of field measurements in the UHF TV band (470–860 MHz) conducted in EU is presented. To obtain empirical values for the parameters upon which unlicensed radio devices are able to distinguish in a real scenario between empty and occupied TV channels, signal power measurements have been performed in Italy, Spain, and Romania on rural, suburban, and urban sites, at different heights over the ground by using different analysis bandwidths. The aim of this work is to provide a set of practical parameters upon which harmless unlicensed communication in the UHF TV white space is feasible. The results have been analyzed with respect to the hidden node margin problem, spectrum sensing bandwidth, and occupancy threshold.