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VOL. 6, ISSUE 2 (2021)
Adoption of site diversity to mitigate rain attenuation at Ku and Ka frequency bands
Authors
Abayomi Yussuff IO, Shakirah Adeniji A
Abstract
This work presented the adoption of site diversity technique on rain attenuation for Lagos State at 12 and 23 GHz. Site diversity is an effective technique to mitigate rain attenuation, especially in tropical region with high rainfall rate. This is because the probability of attenuation due to rain occurring simultaneously at all earth-space paths is very low compared with the probability of occurring on either individual slant paths. Local rainfall data at hourly integration time were sourced from Nigeria Meteorological Agency (NIMET), spanning a period of five years (January 2015 to December 2019) for three different stations in Lagos, Nigeria. One-minute rainfall rate distribution for these three selected earth stations (Ikeja, Marina and Ikorodu) were derived from the obtained hourly rain data for various percentages of time exceeded (that is,
). Site diversity technique was implemented by taking the Ikeja station as the reference site. ITU-R Hodge and Paraboni-Barbaliscia models were then applied in succession, to test the efficacy of each of these models. The results obtained showed that Paraboni-Barbaliscia model outperformed the ITU-R Hodge model along Ikeja-Marina and Ikeja-Ikorodu axes at 16.69 and 17.67 km respectively, and with improved link availabilities of 99.981% and 99.982% respectively at 0.1% of the time exceeded. Furthermore, single site diversity method presented higher attenuation exceedances compared to the joint site diversity approach, and this further accentuated the importance and effectiveness of considering adequate baseline site separation distances between the selected earth stations. Joint site diversity is therefore the recommended technique to mitigate against slant path signal outages resulting from equatorial and tropical rain precipitations.
). Site diversity technique was implemented by taking the Ikeja station as the reference site. ITU-R Hodge and Paraboni-Barbaliscia models were then applied in succession, to test the efficacy of each of these models. The results obtained showed that Paraboni-Barbaliscia model outperformed the ITU-R Hodge model along Ikeja-Marina and Ikeja-Ikorodu axes at 16.69 and 17.67 km respectively, and with improved link availabilities of 99.981% and 99.982% respectively at 0.1% of the time exceeded. Furthermore, single site diversity method presented higher attenuation exceedances compared to the joint site diversity approach, and this further accentuated the importance and effectiveness of considering adequate baseline site separation distances between the selected earth stations. Joint site diversity is therefore the recommended technique to mitigate against slant path signal outages resulting from equatorial and tropical rain precipitations. Download
Pages:04-11
How to cite this article:
Abayomi Yussuff IO, Shakirah Adeniji A "Adoption of site diversity to mitigate rain attenuation at Ku and Ka frequency bands ". International Journal of Advanced Science and Research, Vol 6, Issue 2, 2021, Pages 04-11
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