As technology advances andmore demands are on satellite services, rain-induced attenuation still creates one of themost damaging\neffects of the atmosphere on the quality of radio communication signals, especially those operating above 10GHz. System designers\ntherefore require statistical information on rain-induced attenuation over the coverage area in order to determine the appropriate\ntransmitter and receiver characteristics to be adopted. This paper presents results on the time-varying rain characterization and\ndiurnal variation of slant path rain attenuation in the Ka-band frequency simulated with synthetic storm techniques over a\nsubtropical location in South Africa using 10-year rain rate time-series data. The analysis is based on the CDF of one-minute\nrain rate; time-series seasonal variation of rain rate observed over four time intervals: 00:00ââ?¬â??06:00, 06:00ââ?¬â??12:00, 12:00ââ?¬â??18:00, and\n18:00ââ?¬â??24:00; diurnal fades margin; and diurnal variation of rain attenuation. Comparison was also made between the synthesized\nvalues and measured attenuation data. The predicted statistics are in good agreement with those obtained from the propagation\nbeacon measurement in the area. The overall results will be needed for an acceptable planning that can effectively reduce the fade\nmargin to a very low value for an optimum data communication over this area.
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