Rainfall Dynamics Over Two Indian Tropical Stations for Radio Communication

The distribution of rain along the radio propagation path is inhomogeneous. The non-uniformity of rainfall in both the horizontal and vertical directions makes the estimation of slant path attenuation complex. At frequencies above 10 GHz, the effects of attenuation and noise induced by atmospheric gases and rain are quite significant. Rain height data were obtained from the Tropical Rainfall Measuring Mission (TRMM) and NigComSat-1 satellite for 37 stations in Nigeria as reported in the literature. These TRMM and Nigeria data were used to find relationship between the rainfall rate and the effective slant path length. This effective length was used with local parameters at Universiti Teknologi Malaysia (UTM) to estimate the slant path attenuation values at the Ku-band. Furthermore, terrestrial attenuation data at 0.01% of the time for UTM were obtained from the UTM Wireless Communication Centre (WCC). Again, these attenuation data were transformed to slant path attenuation values using a transformation technique available in the literature. The attenuation exceeded for other percentages of the time was also obtained. The breakpoint model along with the ITU-R, DAH, Crane, Mandeep and the proposed modified ITU-R models were considered. It was observed that the validation results at 12 GHz clearly suggested that the proposed modified ITU-R model's estimates seem to provide fairly more acceptable results when compared with other models of interest.

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Dimensional statistics of rainfall signature and fade duration for microwave propagation in Nigeria

Ojo

Ajewole

2011

2011 XXXth URSI General Assembly and Scientific Symposium

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As the communication services are increasingly demanding more access for higher frequencies up to Ka-band and beyond, dimensional statistics of rainfall for predicting rain induced attenuation is required in order to estimate the link budget and the communication performance. Attenuation due to rain restricts the path length of radio communication systems and limits the usage of higher frequencies for terrestrial point-to-point microwave links and satellite communications. In this paper, some results of dimensional statistics of rainfall signature and fade duration are presented. Rain events are studied to examine the efficacy of predicting the slant-path attenuations from point rain rate measurements.

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Rainfall Dynamics Over Two Indian Tropical Stations for Radio Communication

Cited by 4 publications

References 8 publications

Statistical characterizations of rainfall structure over two tropical stations in southern India for microwave communication

Statistical characterizations of rainfall structure over two tropical stations in southern India for microwave communication

Comparison of slant path rain attenuation models using data from a tropical station

Dimensional statistics of rainfall signature and fade duration for microwave propagation in Nigeria

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