An Improved ITU-R Rain Attenuation Prediction Model Over Terrestrial Microwave Links in Tropical Region
An improved approach of predicting rain attenuation Cumulative Distribution (CD) over terrestrial microwave links operating in tropical regions is presented in this paper. The proposed method offers a better extrapolation approach for determining the values of rain attenuation at different exceedance probability from the measured attenuation at 0.01% of the time. The experimental data consist of measured rainfall rates and rain attenuation over six geographically spread DIGI MINI-LINKs operating at 15 GHz in Malaysia. A new set of numerical coefficients was derived for improved rain attenuation CD predictions in the Malaysian tropical climate. In order to test the applicability of the proposed extrapolation method, a validation was performed using rain rate and rain attenuation measurements from five Brazilian and seven Nigerian tropical locations.