Absbact -Terrestrial links operating at frequencies higher than IO GHz suffers degradation due to rain. Various researches have been conducted to study rain-induced degradations such as rain attenuation. Apart from rain attenuation, rain fade is also a major factor affecting the performance of a terrestrial microwave link. This paper therefore, seeks to investigate the impacts of rain fade to the performance of terrestrial microwave links. In this paper, rain fade slope and rain fade depth are investigated and analyzed. The superposition of rain attenuation and rain fade is also investigated. Signal fall time and recovery time are also major concern n this paper. All the analysis leads to understanding on the impacts of rain fade on the performance and reliability of microwave terrestrial links lntrodnctionFor terrestrial microwave links operating at frequencies higher than 10 GHz, rain-induced degradations are significant. Major degradations caused by rain that affect the reliability and availability of terrestrial links are rain attenuation and rain fade. In researches to determine rain attenuation. receive signal of a terrestrial link is sampled to an integration time of one minute [I-31. Besides attenuation, rain fade is another major factor affecting the performance of microwave links. Rain fade is the dynamic fluctuation of receive signal due to inhomogeneities of the signal path, ranging from a few seconds to a few minutes. Rain fade provides additional information on understanding the characteristics of rain-induced degradations.0-7803-8129-7/03/$17.00 02003 IEEE.The next section briefs on the research experimental setup. Then, the following section reports on results and analysis. The analysis is focused on rain fade slope and rain fade depth. Besides that, the relationship between fade slope to fall time and recovery time is discussed. The additional impact due to superposition of fade depth and attenuated signal is also discussed.
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