1、STDeCEPT ERC REPORT Lb-ENGL 1992 W 2326424 OOL5LL9 57b I ERC REPORT 16 7 European Radiocommunications Committee (ERC) . within the European Conference of Postal and Telecommunications Administrations (CEFT) -. %-. -._, ANALYSIS OF SHARING BETWEEN TERRESTRIAL FIXED SERVICE AND SPACE RESEARCWEES (S-E)
2、 AT 38 GHz Madrid, October 1992 STD-CEPT ERC REPORT Lb-ENGL 1992 Z32b4L4 OOL5120 298 I Copyright 1992 the European Conference of Postai and Telecommunications Administrations (CEPT) - _ ERC REPORT 16 Page 1 ANALYSIS OF SHARING BETWEEN TERRESTRIAL FIXED SERVICE AND SPACE RESEARCWEES (S-E) AT 38 GHz I
3、NTRODUCTION At WARC 92, new allocations for space research and earth exploration satellite services were introduced into the band 37 GHz - 40.5 GHz. At present (May 1992), it is stated in the Radio Regulations that the Power Fiux Density (PFD) limits given in Nos. 2578/2584 apply in this frequency b
4、and. In addition, CEPT Recommendation TIR 12- 01E (Helsinki 1991) recommended that CEPT should develop necessary sharing criteria between the services authorised by the Radio Regulations. The object of the analysis is to assess the impact of using the currently specified PFD limits on the terrestria
5、l fixed links. ANALYSIS The interfering signal from satellite to the fixed link station varies depending on the incident angle. Annex I works out the power received at the fixed link receiver input for incident angles between O and 50, taking into account fixed link antenna radiation pattern envelop
6、e and system losses. The following calculation is based on a 2 Mbit/s system operating over a bandwidth of 7 MHZ. In order to assess the extent of the problem, the following assumptions are made and some of parameters are extracted from ETSI DEITM-4001: A Co-channel interference case is considered:
7、Antenna Effective Aperture Antenna Gain Antenna Sidelobe Gain at an incident angle of 20 Bit Rate Channel Spacing Link Length Availability UK Rain Zone Rain Fade Margin, M The following satellite parameters are used: Incident Angle PFD in 1 MHz 0.125 m 44 dBi 6.7 dBi 2 Mbis 7MHz 5km 99.999% F 60 dB
8、20“ -107.5 dB(W/m2) The interfering satellite signal after conversion to 7 MHz bandwidth equals to -99.05 dB(W/m2). The interfering signal collected by a terrestrial receiving antenna of effective aperture of 0.125 m2 is: -99.05 dB(W/m2) + 10 log 0.125 = -108.08 dBW in 7 MHz bandwidth The interferin
9、g signal power arriving at the receiver input is: Incident Power in 7 MHz - Discrimination at 20“ - Fixed System Losses = -108.08 dBW - (44 - 6.7) dB - 6 dB = -151.38 dBW Annex I shows a similar analysis for different bit rate systems with different incident angles. STD-CEPT ERC REPORT Lb-ENGL 3992
10、.I 232b4L4 O035322 Ob0 I 2 Mbit/s -140 dBW ERC REPORT 16 Page 2 8 MbNs 34 Mbitls 140 Mbii/s -134 dBW -131 dBW -124 dBw Table 1 3. CONCLUSION It can be seen from Annex I that, apart Com the main beam direction (and this scenario is unlikely), all the inter- fering power arriving at the fixed link rec
11、eiver input is below the limits specified in Table 1 This does indicate that sharing between Fixed Service (FS) and Space ResearchEES at 38 GHz is feasible. .“. Incident Angle PFD WE O -115 44 1 -115 44 2 -115 44 3 -115 44 4 -115 44 5 -115 21.7 6 -1 14.5 20.36 7 -114 19.02 8 -1 13.5 17.68 9 -113 16.
12、34 10 -1 12.5 15 11 -112 14.17 12 -111.5 13.34 13 -111 12.51 14 -1 10.5 11.68 15 -110 10.85 16 -109.5 10.02 17 -109 9.19 18 -108.5 8.36 19 -108 7.53 20 -107.5 6.7 21 -107 6.25 22 -106.5 5.8 23 -106 5.35 24 -105.5 4.9 25 -105 4.45 26 -105 4 27 -105 3.55 28 -105 3.1 29 -105 2.65 30 -105 2.2 31 -105 1.
13、925 32 -105 1.65 33 -105 1.375 34 -105 1.1 35 -105 0.825 36 -105 0.55 37 -105 0.275 39 -105 -0.275 38 -105 4.4E-16 40 -105 -0.55 41 -105 -0.825 42 -105 -1.1 43 -105 -1.375 44 -105 -1.65 45 -105 - 1.925 46 -105 -2.2 47 -105 -2.475 48 -105 -2.75 49 -105 -3 .O25 50 -105 -3.3 Discriminatio n O O O O O 2
14、2.3 23.64 24.98 26.32 27.66 29 29.83 30.66 31.49 32.32 33.15 33.98 34.8 1 35.64 36.47 37.3 37.75 38.2 38.65 39.1 39.55 40 40.45 40.9 41.35 41.8 42.075 42.35 42.625 42.9 43.175 43.45 43.725 44 44.275 44.55 44.825 45.1 45.375 45.65 45.925 46.2 46.475 46.75 47.025 47.3 ERC REPORT 16 Page 3 ANNEX 1 2Mbi
15、s 7MHz -121.579 -121.579 -121.579 -121.579 -121.579 -143.879 -144.719 -145.559 -146.399 -147.239 - 148.079 - 148.409 -148.739 -149.069 -149.399 -149.729 -150.059 -1 50.389 -150.719 -1 5 1 .O49 -151.379 -151.329 -151.279 -1 5 1.229 -151.179 -1 5 1.129 -151.579 -152.029 -152.479 -1 52.929 -153.379 -1
16、53.654 -1 53.929 - 1 54.204 -154.479 -1 54.754 -155.029 -155.304 -155.579 -1 55.854 -156.129 -1 56.404 -156.679 -1 56.954 -157.229 -157.504 -157.779 -1 58.054 -158.329 -1 5 8.604 -158.879 8Mbis 14MHz -118.569 -1 18.569 -1 18.569 -1 18.569 -118.569 - 140.869 -141.709 -142.549 - 143.3 89 -144.229 - 14
17、5 .O69 - 145.399 -145.729 - 146.059 - 146.389 -146.719 -147.049 -147.379 - 147.709 -148.039 -148.369 -148.319 - 148.269 -148.219 -148.169 -148.1 19 -148.569 -149.019 - 149.469 -149.919 -150.369 -150.644 -150.919 - 15 1.194 - 15 1.469 - 15 1.744 -152.019 - 152.294 -152.569 -152.844 -153.119 -153.394
18、-153.669 -153.944 -154.219 -154.494 -154.769 -155.044 -155.319 -155.594 -1 55.869 34Mbis 28MHz -1 15.559 -1 15.559 -1 15.559 -115.559 -138.699 -115.559 - 137.859 - 139.539 - 140.379 -141.219 -142.059 -142.389 -142.719 -143.049 -143.379 - 143.709 -144.039 -144.369 -144.699 - 145.029 -145.359 -145.309
19、 - 145.259 - 145.209 -145.159 - 145.109 -145.559 - 146.009 - 146.459 - 146.909 -147.359 -147.634 -147.909 -148.184 -148.459 - 148.734 - 149.009 - 149.284 -149.559 - 149.834 - 150.109 -150.384 -150.659 -150.934 - 15 1.209 -151.484 -151.759 -152.034 -152.309 -152.584 -152.859 140/155Mb 140MHz -108.569
20、 -108.569 -108.569 -108.569 -108.569 -130.869 -131.709 -132.549 -133.389 - 134.229 -135.069 - 135.399 - 135.729 -136.059 -136.389 - 136.7 19 -137.049 -137.379 -137.709 - 138.039 -138.369 -138.319 -138.269 - 138.21 9 -138.169 -138.119 -138.569 - 139.01 9 - 139.469 -139.919 -140.369 - 140.644 -140.919 -141.194 -141.469 -141.744 -142.019 -142.294 -142.569 -142.844 -143.119 -143.394 -143.669 - 143.944 -144.219 -144.494 -144.769 - 145 .O44 - 145.3 19 -145.594 -145.869
