Effect of multipath and snow on millimeter wave scintillations on a 4.1-km line-of-sight link |
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| Affiliation: | 1. NOAA/ERL/Wave Propagation Laboratory, 325 Broadway, Boulder, CO 80303, U.S.A.;2. Department of Electronic and Electrical Engineering, University College London, Torrington Place, London WC1E7JE, U.K.;1. Deutsche Telekom, Landgrabenweg 151, 53227 Bonn, Germany;2. Real Wireless, PO Box 2218, Pulborough, West Sussex, RH20 4XB, United Kingdom;3. Telefónica I+D, Zurbarán 12 - 28010 Madrid, Spain;1. School of Computer Science and Engineering, Central South University, Changsha 410083, PR China;2. Department of Computer Science and Engineering, State University of New York at Buffalo, Buffalo 14200, USA;3. School of Computer Science and Engineering, Hunan Provincial Key Lab on Bioinformatics, Central South University, Changsha 410083, PR China |
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| Abstract: | Multipath propagation can occur for various reasons. For example, it can be due to sudden changes in the refractive index of the propagation medium or to reflections from melting snow/ice. We find that dry snow, or even ‘moist’ snow at 0°C, has no measurable effect on the propagation of radio waves up to at least 54.5 GHz. When multipath propagation occurs, the low frequency part of the scintillation spectrum is distorted. The usual theoretical predictions applicable to line-of-sight millimeter wave propagaton through clear air turbulence must be used with caution when the scintillations of the propagating signals are a result of multipath effects. It is also noted that propagation through vegetation greatly distorts the clear-air scintillation spectrum. Saturation of scintillations, which can also dramatically alter the scintillation spectrum, is not expected to be a problem for millimeter wave propagation over line-of-sight paths. |
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