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Recommendation ITU-R F.758 -4 when FS frequency [22] provides fixed service charactersitics for sharing with aircraft-mounted FSS Earth stations in the band 27.5-29.5 GHz is considered. Note that Rec. ITU-R F.758-4 has also been newly revised; the draft revision is currently in the final stage of being approved and publication of new version F.758-5 is expected soonband.. As specified in the Recommendation (Annex 2 of its , Section 4), the system parameters shown are providedare not representative of any actual FS system, but represent an averaging or an expected range of values suitable for generic sharing/compatibility studies.
Stations FS5 and FS6 in the table 1 Table 70 Error! Reference source not found.below have parameters in line with the Rec. ITU-R F.758 -5.Also four other representative FS stations FS1, FS2, FS3 and FS4 can be proposed as given in in Table 1[22]. . FS1 and FS3 stations are representative of typically deployed PP FS stations typically deployed, . FS2 is representative of a longer than usual typical link operating in Scotland or Wales where the terrain is mountainous mountainous terrain and hence an elevation angle of 5 degrees is appropriate, while . FS4 is representative of a P-MP Hub station; . P-MP subscriber stations are expected to have parameters similar to those valid for PP stations.
Antenna radiation patterns for FS-PP are usually assumed in sharing studies using the formulas in Recommendation ITU-R F.699 [23] (when a single FS system is considered as victim/interferer) or Recommendation ITU-R F.1245 [24] (when averaging among a number of FS systems as victim/interferer). For P-MP it is recommended to use the Recommendation ITU-R F.1336 [25].
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[A1]But no justificiation for FS3 which has a higher elevation angle of 10 degrees?
Table 6971: Recommended FS characteristics for FS vs FSS studiesAnchor T069T071T069 T071
Parameter | FS1 (PP) | FS2 (PP) | FS3 | FS4 | FS5 (PP based on Rec. ITU-R 758-5) | FS6 (P-MP based on Rec. ITU-R 758-5) | Notes |
RX antenna height | 20 m | 20m | 20m | 20m | Not specified, 20m is suggested | Not specified, 20m is suggested |
RX antenna pattern | ITU-R | ITU-R | ITU-R | ITU-R | ITU-R Rec. | ITU-R | Source: |
Receiver noise figure, F | 6 dB | 6 dB | 6 dB | 6 dB | 8 dB | 8 dB | See note (1)[1] |
RX frequency | 28 GHz | 28 GHz | 28 GHz | 28 GHz | 24.25 – 29.50 GHz | 24.25 – 29.50 GHz |
RX elevation angle | 0° | 5° | 10° | 0° | Not specified, 10° is suggested | Not specified, 0° is suggested |
RX peak gain | 45 dBi | 43 dBi | 35 dBi | 18 dBi |
6.5 dBi |
See note (2)[2] |
The Spectrum Mask for P-P and P-MP can be found in ETSI EN 302 217-2-2 [26] Annex A (table A4) and EN 302 326-2 (Section 5.3.4.1) respectively. Blocking information is available from EN 301 390 (Section 7).
With respect to antenna height for P-P, the BS and TS minimum antenna height are
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20 m and for P-MP, the BS minimum antenna height is
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20 m and the TS minimum antenna height is
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1.5 m.
For the antenna elevation, some countries have reported an elevation range of 3 to 10
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degrees. In rare cases a range of maximum elevation angle from 15 to 30
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degrees has been reported
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.
ECC Report 100
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uses an I/N ≤ -10 dB; I/N ≤ -6 dB is
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mentioned only for the protection of ENG/OB. FS systems (
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P-P and P-MP
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) commonly adopt I/N ≤ -10 dB
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in line with Rec. ITU-R
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F.758
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[22]
[1] The System noise power density shall be obtained from the following equation:
N0 (dBW/Hz)= F(dB) + 10*log10(kT0)
Where where : T0 = 290 K, F is the noise figure and k is the Boltzmann constant it results. This is equivalent to:
N0 (dBW/Hz) = F(dB) - 204 (dBW/Hz) or N0(dBm/MHz) = F(dB) - 114 (dBm/MHz)
[2] The difference between the peak gain values of stations FS1 and FS2 comes from the fact that a typical PP FS station with high elevation angle (10°) is usually employed for short-range links near hilly areas.