A SEMI-EMPIRIC CONSISTENT MODEL FOR RAIN ATTENUATION PREDICTION IN TERRESTRIAL AND SATELLITE RADIO LINKS
The development of new technologies for broadband wireless access, usingincreasingly higher frequencies, points to the necessity of more accurate methodsfor rain attenuation, that represents the most serious impairment for radio systemsoperating in frequencies above 10 GHz. This work presents semi-empiricalmodels for the prediction of rain attenuation in terrestrial and satellite links. Themodels were developed using data obtained in concurrent measurements of rainattenuation and point rainfall rate in different regions of Brazil. Some of thesemeasurements were performed as part of this work and some were alreadyavailable from previous measurements campaigns. Data available in the UIT-Rdata banks of propagation measurements were also used, in order to developglobal methods. The models that have been developed allow the prediction of thecumulative probability distribution of rain attenuation from the cumulativedistribution of point rainfall rate in the region of the link. Although severalmethods with these purpose can be found in the technical literature, the onesdeveloped in this work present some important features that are not found, as awhole, in any of those models: they use the full rainfall rate distribution over theentire range of time percentages of interest; the terrestrial and satellite models areconsistent, that is, the elements used in the terrestrial prediction model are kept inthe satellite prediction model that involves a mor complex geometry. Besides that,the models proposed show an excelent performance in terms of prediction error,when compared with measured data.
Advisor:MAURO SOARES DE ASSIS; ERASMUS COUTO BRAZIL DE MIRANDA; ERASMUS COUTO BRAZIL DE MIRANDA; LUIZ ALENCAR REIS S MELLO; RODOLFO SABOIA LIMA DE SOUZA; LUIZ ALENCAR REIS S MELLO; ERASMUS COUTO BRAZIL DE MIRANDA; NELSON ALEXANDER PEREZ GARCIA
Source Type:Master's Thesis
Date of Publication:08/11/2006