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Time-Variant Radio Channel Characterization and Modelling of Vegetation Media at Millimeter-Wave Frequency

Rebelo, S. Morgadinho ; Caldeirinha, Rafael ; AL-Nuaimi, M. ; Cuinas, I. ; Sanchez , M. ; Fernandes, T. ; Richter, J.

IEEE Transactions on Antennas and Propagation Vol. 60, Nº 3, pp. 1557 - 1568, March, 2012.

ISSN (print): 0018-926X
ISSN (online): 0018-926X

Journal Impact Factor: 2,181 (in 2014)

Digital Object Identifier: 10.1109/TAP.2011.2180301

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Abstract
This paper presents results of an extensive measurement campaign to characterise and attempt to model dynamic effects on the radio channel in vegetation media at 40 GHz. Using two small trees in an anechoic chamber, narrowband fast-fading measurements, utilising co-polarised signals, were conducted to obtain radio channel characterisation. This was performed as a function of the bi-static scattering angle, wind speed, wind incidence, and tree species. Furthermore a modelling methodology, based on a simplified set of Markovian parameters, is investigated and assessed as to its feasibility to model vegetation dynamics. The methodology is representative of the radio signal in the three main identified propagation regions around a vegetation volume as a mean to satisfactorily model highly time-variant radio signals. The propagation regions considered are receiver angular sections (in the azimuth plane) around the tree, where the received signal behaves distinctly for each region. Performance validation results are presented using one of the tree species.