Okinawa Prefecture is the island area of subtropical climate. The Islands is scattered over a large area of North, South, East and West. Therefore, there are many areas where the high-speed Internet network is not provided with basic services. In order to analyze the area problems, It is necessary to use the easy sub-millimeter wave band radio communications of high bandwidth called Ka band satellite communication WINDS and FWA as remedy. (WINDS: Wideband InterNetworking engineering test and Demonstration Satellite. FWA: Fixed Wireless Access) However, since the frequency band are weak in rain, the rainfall margin for the design of wireless links needs to be considered due to the large rainfall attenuation. The technology of compensating degradation of the communication quality by rain attenuation is studied for many years. However, in the field of satellite communication, the research has been actively at Ku band. So, there are still few research examples of the rain damping characteristic in terrestrial communication and satellite communication at Ka band. The actual proof experiment using the 18 GHz and 26 GHz band FWA were conducted by Tsuken Island and University of the Ryukyus (about 17km) in April, 2006. As a result of this experiment, we could obtain precious data sets. In this research we examine about the rain attenuation model based on a time series analysis technique and we do the molding of the rain attenuation characteristic in a short time.
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