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occurs earlier than expected; in 1.5 M mode, the re-con-structor seems to have better performance, and attains performance of 1 dB error than the 15.1 dB theoretically expected.e 1.2 m VSAT earth station estimated EIRP was veried by comparing between the 1 m portable VSAT estimated EIRP. Figure 8 shows the verication results, where each of the transmission modes has almost identical packet loss versus estimated EIRP to each other; it means that the earth station estimated EIRPs are appropriately obtained.FiF81.2 m VSAT/1m portable VSAT estimated EIRP versus packet loss rates (MBA)Figure 9 and Table l show the 1.2 m VSAT standard level diagram for the case where only MBA Kanto 1 beam is used and the satellite output power is 280 W.Figure 10 shows the packet loss versus earth station estimated EIRP—converted by using an earth station level diagram—in the case of using APAA and 2.4 m VSAT by the same method as that used for MBA. By comparing two characteristics between of APAA (Fig. 10) and MBA (Fig. 7), the packet loss versus earth station estimated EIRP characteristics of the APAA is very close to the MBA with a shi of about 11 dB. is shi matches the G/T dierence of APAA and MBA. Such a dierence naturally occurs because the re-constructer in the WINDS onboard base-band switch (ABS) is commonly used for APAA and MBA.As the uplink rain compensation conclusion, both the compensation by UPC and the compensation by transmis-sion mode alteration work ware successfully veried almost as well as the theory predicted. In addition, when both methods are used for uplink rain attenuation compensation in MBA, the maximum compensation of 26.7 dB is obtained by the dierence between the VSAT maximum EIRP 61.7 dBW and 35 dBW which is the EIRP for MBA just before packet loss emergence as shown in Fig. 7. On the other hand, for APAA, 31.2 dB compensation is obtained, by the dierence between 2.4 m VSAT with a higher satu-ration output power HPA EIRP 77.2 dBW and 46 dBW which is approximately 11 dB shied from 35 dBW of 1.5 M mode MBA packet loss start estimated EIRP.3Downlink rain attenuation compensatione mode 155 M is solely used for the WINDS regen-erative link signal transmission. WINDS has an 8-port multiport amplier (MPA) on board to simultaneously provide eight regions, domestic or international, with xed communication links. e output power of each port is independently adjustable; however, the total output power of the eight ports is limited to 280 W. e standard station performs its downlink rain attenuation compensation by adjusting each port’s MBA output power within the range of surplus power using the data obtained through the sta-tistically processing of the reference burst signal’s C/N0 margin which is periodically transmitted from a VSAT existing in the service area to standard stations [4]. Note that the satellite MBA EIRP depends on the number of spot FiF10Earth station estimated EIRP versus packet loss rates (APAA)FiF9　1.2 m VSAT standard level diagram (MBA)ATT1.9～2.5GHz27.5～28.1GHzGainInitial Setting (Association)2927Output Level (dBm)-26.7-31.214.82.329.327.4Gain/Loss (dB)-4.546.0-12.527.0-1.947.6input(dBm)gain(dB)output(dBm)output(W)EIRP(dBW)2.327.029.30.8445.08.327.035.33.4051.014.326.941.213.2956.918.326.244.528.4360.251MSSPA Non-linear characteristicsANTOperationMode1.5M6M24MIDUIFL20mBUCATT/WGSSPAWG813-2 Experiment Report for Rain Attenuation Compensation