Rain induced degradations are significant for terrestrial microwave links operating at frequencies higher than 10 GHz.

This result shall be helpful to predict rain fading properties. The Ku-band rain attenuation (12.25 GHz) is converted to the Ka-band down-link (19.8, 20.73 GHz) attenuation by using ITU-R P. 838-3 recommended coefficients along with the locally derived empirical values of power law coefficients which allow for calculating the specific attenuation in dB/km from the knowledge of rain rate. 618-12 prediction with the use of ITU-R P. It focuses on the discussion and comparison of ITU-R P. The received signal data for rain attenuation and rain rate were collected in 10 second intervals over a three year periods from 2013 to 2015. This paper presents the suitable regression coefficients for specific attenuation calculated on the yearly basis in 19.8 GHz experimental link set up at Korea Radio Promotion Association, Mokdong, Seoul. Scattering and absorption of radio frequency signal by rain is prevalent at frequencies above 10 GHz. These statistics can be useful for communication systems whose service quality and design require seasonal and diurnal variation. 618-13 frequency scaling method, and these predictions are compared with experimentally measured values. Furthermore, the paper presents an overview of the predicted monthly variation of rain attenuation estimation of 2013 year for Ka band in 19.8 and 20.73GHz from 12.25GHz link which are obtained from the ITU-R P. Moreover, the statistics analyzed to 6 hour contiguous periods of the day are also shown. A monthly variation of the coeﬃcients has been indicated, and the empirical measured data were compared with the ITU-R P. 618-12 and empirically generated regression coeﬃcients values for ITU-R P. The comparison of measured data for monthly variation illustrates the suitability for the estimation of signal in Kaband whose appropriateness is veriﬁed through the comparison with prominent rain attenuation models namely ITU-R P. The received signal data for rain attenuation and rain rate were collected at 10 second intervals over a three year period from 2013 to 2015. This paper analyses the performance on three years of rain rate and rain attenuation measurement to study the empirical determination of power law coeﬃcients calculated for monthly distribution of rain attenuation from the knowledge of rain rate at 19.8GHz link for COMS1 in South Korea.

Statistics of monthly and diurnal variations in the occurrence of rain fades are needed to give a detailed insight for system design of these services.

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