Seasonal Variations of Polarization Diversity Gain in a Vegetated Area considering High Elevation Angles and a Nomadic UserReportar como inadecuado




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International Journal of Antennas and Propagation - Volume 2015 2015, Article ID 194626, 9 pages -

Research ArticleDepartment of Electromagnetic Field, Faculty of Electrical Engineering, Czech Technical University in Prague, Technicka 2, 166 27 Prague 6, Czech Republic

Received 20 September 2014; Revised 1 December 2014; Accepted 8 December 2014

Academic Editor: Jit S. Mandeep

Copyright © 2015 Milan Kvicera and Pavel Pechac. 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

Seasonal variations of the polarization diversity gain are addressed for a nomadic user in a vegetated area taking high elevation angles and nongeostationary satellites into consideration. Corresponding experimental data were obtained at a frequency of 2.0 GHz at Stromovka Park in Prague, the Czech Republic, within the full in-leaf and out-of-leaf periods of 2013 and 2014, respectively. By detecting copolarized and cross-polarized components of the transmitted left- and right-handed circularly polarized signals, the corresponding diversity gain was obtained for multiple-input single-output MISO, single-input multiple-output SIMO, and combined MISO-SIMO cases. It was found that tree defoliation results in a significant decrease of the polarization diversity gain achieved for low time percentages in particular scenarios.





Autor: Milan Kvicera and Pavel Pechac

Fuente: https://www.hindawi.com/



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