Institute for Telecommunication Sciences
the research laboratory of the National Telecommunications and Information Administration

Richard H. Espeland; E. J. Violette; Kenneth C. Allen

Abstract: A diagnostic probe designed to investigate propagation at millimeter wavelengths was operated on 11.8 and 27.2-km line-of-sight paths near Boulder, CO. A 30.3-GHz carrier is biphase-shift-keying modulated at a 500 Mb/s with bit error rates less than 10-8 in clear air and a fade margin of about 30 dB on the 27.2-km path. In addition, fully coherent carrier wave channels at 11.4, 28.8, and 96.1 GHz provide data to analyze fade mechanisms and evaluate frequency dependent performance characteristics of the link. Data during fog, snow, rain, and clear-air fade events are included with statistical analyses of event occurrence, signal levels, and bit error rates. Time delay distortion and amplitude dispersion on the channel are also examined during fading events by the wide-band digital channel operated as an impulse probe. Rain attenuation, path absorption due to water vapor content, and seasonal variations as a function of frequency are presented and described.

Keywords: millimeter waves; propagation; digital; diagnostic; probe; atmospheric; water vapor; wide band


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Institute for Telecommunication Sciences
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Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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