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Worst month, cloud and water vapor attenuation and fade duration from radiometer measurements

Rocha, A.

Worst month, cloud and water vapor attenuation and fade duration from radiometer measurements, Proc Ka and Broadband Communications Conf., Matera, Italy, Vol. 1, pp. 71 - 76, September, 2008.

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Abstract
The use of higher and higher frequencies for satellite communications requires improved propagation models as propagation impairments impact more seriously communication systems. Water vapor and clouds attenuation increase with frequency and also contributes to the increase of antenna sky noise temperature. To cope with increased attenuation due to rain, fade mitigation techniques are required to improve quality of service. We present propagation results on a slant path based on radiometer estimated attenuation. The most important are cloud and water vapor integrated contents that are compared with recent ITU models. The worst month for attenuation is also addressed ranging from a year to year to total database analysis and adequacy of ITU proposed models. Also conclusions concerning event fade duration distributions, some already presented at other publication, are briefly described.