A method for the prediction of the slant path rain attenuation statistics is proposed, based on the Weibull distribution for the representation of the point rainfall rate statistics. The inhomogeneity of the rainfall medium is described by means of the spatial autocorrelation function.Numerical results derived by using the proposed model have been compared with available experimental data taken from the most recent ITU-R database.Comparison is also made with another prediction method recommended by the International Radio Consultative Committee and some useful conclusions are deduced. More particularly, the present method has been found to give improved results for the higher percentages of time. On the other hand, the CCIR method is superior for the lowest levels (0.003% and 0.001%) .
SUMMARYIn modern satellite communications, matters such as frequency congestion, transmission of dual polarized carriers and increase of the number of geostationary satellites in use, necessitate the implementation of interference analysis in neighbouring networks so as to ensure satisfactory quality of service. In this paper, a recently proposed model for the prediction of the degradation of the carrier-to-interference ratio due to differential rain attenuation and cross-polarization, which is applicable only for the noise-dominant case, has been properly modified to include the general case. The proposed model is based on the lognormal assumption for the point rainfall rate statistics and the convective raincell model. Due to complexity of the proposed analysis, some simple regression-derived formulas have been generated forming a very useful tool for the system engineer. The elaborations of numerical results examine the influence of various parameters upon the total availability performance and the optimum utilization of the geostationary orbit.
In the present paper a novel method to predict the degradation of the Carrier-tointerference (C/l) ratio, due to rain attenuation --depolarization, on a satellite system interfered by an adjacent terrestrial microwave link is proposed. This method refers to the case that both communication systems operate under the dual polarization mode. It is based on a model convective rain cell structure of the rainfall medium as well as the assumption that both the point rainfall statistics and the rain attenuation follow a lognormal distribution. Numerical results are presented referring to communication systems operating in Italy.
Simple, regression-derived formulas have been generated to estimate differential rain attenuation statistics on converging microwave paths. The proposed expressions are based on a regression fitting analysis implemented on an existing analytical model. The resulting simple model is tested with experimental data taken from Brazil with very good agreement. The impact of differential rain attenuation on the interference performance of a local multipoint distribution system (LMDS) is also studied.Index Terms-Differential rain attenuation, interference local multipoint distribution system (LMDS)/local multipoint communication systems (LMCS), terrestrial communications.
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