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International Journal of Antennas and Propagation
Volume 2013 (2013), Article ID 804690, 11 pages
http://dx.doi.org/10.1155/2013/804690
Research Article

Empirical Doppler Characterization of Signals Scattered by Wind Turbines in the UHF Band under Near Field Condition

1Department of Communications Engineering, University of the Basque Country (UPV/EHU), Alda. Urquijo s/n, 48013 Bilbao, Spain
2Communications Research Centre, Ottawa, ON, Canada K2H 8S2

Received 29 October 2012; Accepted 21 January 2013

Academic Editor: Lars Norin

Copyright © 2013 Itziar Angulo 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

Time variability of the scattering signals from wind turbines may lead to degradation problems on the communication systems provided in the UHF band, especially under near field condition. In order to analyze the variability due to the rotation of the blades, this paper characterizes empirical Doppler spectra obtained from real samples of signals scattered by wind turbines with rotating blades under near field condition. A new Doppler spectrum model is proposed to fit the spectral characteristics of these signals, providing notable goodness of fit. Finally, the effect of this kind of time variability on the degradation of OFDM signals is studied.