i.e. is (dB(W/(m2 MHz))), the FDP of fixed wireless stations in 100% of the routes pfdlow –146 would be less than the assumed interference criterion of 10%. FIGURE 5 FDP distribution with from HAPS airships pfdlow Figure 6 shows the interference distribution with the changes of when is Even pfdhigh, pfdlow though is decreased by 6 dB from the maximal difference of the interference distribution pfdhigh less than 10% is only about 5%. 3.2 Interference from HAPS ground stations to a fixed wireless station 3 shows the system parameters of a fixed wireless system and a HAPS system used in the calculation. FIGURE 6 FDP distribution with from HAPS airships pfdhigh TABLE 3 System parameters of a wireless system and a HAPS system Parameters Values Frequency 6 GHz wireless system Antenna radiation pattern Recommendation ITU-R F.1245 Maximum antenna gain 45 dBi Noise figure 4 dB Feeder loss 5.5 dB Diameter of service coverage 110 km Altitude of airship 20 km Antenna radiation pattern of ground Recommendation ITU-R F.1245 HAPS system station Maximum antenna gain of ground station 45 dBi Number of ground stations 367 (uniform distribution) Distance between ground stations 5.5 km Assuming that is 293 is 1 MHz, and is 6 dB, noise power is (dB(W/MHz)). If T K, B NF N –137.93 = 10% is assumed as a criterion, permissible interference power, should be less than I/N IG-T Since depends on the transmitting power of HAPS ground station, the angle between signal IG-T paths, and the distance between fixed wireless station and HAPS nadir, the with these I/N parameters can be calculated by equation (8). Figure 9 shows the values of with the transmitting power, at every azimuth angle, when I/N PHG the distance, is 100 km. From this figure, it turns out that the interference power is naturally r
i.e. pfdlow is –146 (dB(W/(m2 MHz))), the FDP of fixed wireless stations in 100% of the routes would be less than the assumed interference criterion of 10%. FIGURE 5 FDP distribution with pfdlow from HAPS airships Figure 6 shows the interference distribution with the changes of pfdhigh, when pfdlow is Even though pfdhigh is decreased by 6 dB from the maximal difference of the interference distribution less than 10% is only about 5%. 3.2 Interference from HAPS ground stations to a fixed wireless station 3 shows the system parameters of a fixed wireless system and a HAPS system used in the calculation. FIGURE 6 FDP distribution with pfdhigh from HAPS airships TABLE 3 System parameters of a wireless system and a HAPS system Parameters Values Frequency 6 GHz wireless system Antenna radiation pattern Recommendation ITU-R F.1245 Maximum antenna gain 45 dBi Noise figure 4 dB Feeder loss 5.5 dB HAPS system Diameter of service coverage 110 km Altitude of airship 20 km Antenna radiation pattern of ground station Recommendation ITU-R F.1245 Maximum antenna gain of ground station 45 dBi Number of ground stations 367 (uniform distribution) Distance between ground stations 5.5 km Assuming that T is 293 K, B is 1 MHz, and NF is 6 dB, noise power N is –137.93 (dB(W/MHz)). If I/N = 10% is assumed as a criterion, permissible interference power, IG-T should be less than Since IG-T depends on the transmitting power of HAPS ground station, the angle between signal paths, and the distance between fixed wireless station and HAPS nadir, the I/N with these parameters can be calculated by equation (8). Figure 9 shows the values of I/N with the transmitting power, PHG at every azimuth angle, when the distance, r is 100 km. From this figure, it turns out that the interference power is naturally
R-REC-F.1764-1-201105-I!!MSW-E.docx