Effect of multipath fading on millimetre wave propagation: a fieldstudy
Ali, A.A.; Alhaider, M.A.
Microwaves, Antennas and Propagation, IEE Proceedings H
Volume 140, Issue 5, Oct 1993 Page(s):343 - 346
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Summary:Analysis of clear air fading encountered on millimetric wave and
infrared radio links are presented. The analysis is based on data
obtained during a four-year field study in the city of Riyadh, Saudi
Arabia. The region can be considered as a typical arid climate where the
rate of evaporation is higher than the rate of precipitation. Maximum
rain rate is of the order of 30 mm/h for 0.001% of the year. A brief
description of the experimental setup is presented, together with the
results of measuring clear air fading experienced by the radio links.
Statistical characterisation of fading is given for both the millimetric
wave links operating near 40 GHz and the infrared radio link at a
wavelength of 0.88 μm. It is shown that fading is dominated by
multipath, having a Rayleigh amplitude distribution and an occurrence
factor similar to the microwave band. Fades were highly correlated for
the two links sharing the same path and separated in frequency by 1%.
Multipath fading was also measured on the infrared link. Even at the
short hop length at 0.75 km, the occurrence factor was about 1%. Time
duration of fades are also analysed, and fade durations were essentially
exponentially distributed. Small fades, however, have normal duration
distribution
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