1、L I - I I N TE RN AT I ON AL TE L ECO M M U N I CAT I ON U N I ON B0.2019 I n t e rfe re n ce calculation methods - RADIOCOMM U N KATION BU REAU 2810200. 15.37 THE RADIOCOMMUNICATION SECTOR OF THE ITU The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and econo
2、mical use of the radio-frequency spectrum by all radiocommunication services, including satellite services and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication Sector are performed by W
3、orld and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Contact address for inquiries about radiocommunication matters: ITU Radiocommunication Bureau Place des Nations CH-121 1 Geneva 20 Switzerland Telephone +41227305800 Fax +41 22 730 5785 Inte
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6、itten permission from the ITU. INTERNATIONAL TELECOMMUN KATION UN ION B0.2019 I n te rfe re n ce calculation methods S RAD I OCOM M U N ICATI ON BU REAU STD-ITU-R RECMN B0-2019-ENGL 1999 4855232 053b830 380 BO SERIES ITU-R REPORTS BROADCASTING-SATELLITE SERVICE (SOUND AND TELEVISION) (Radiocommunica
7、tion Study Groups 1 O and 1 i ) TABLE OF CONTENTS Rep. ITU-R B0.2019 Interference calculation methods Page 1 STD-ITU-R RECMN B0-2019-ENGL 3999 W 4855232 053b83L 237 Rep. ITU-R B0.2019 1 REPORT ITU-R B0.2019 INTERFERENCE CALCULATION METHODS (1 999) 1 Introduction A Special Rapporteurs Group was estab
8、lished during the ITU-R Joint Working Party (JWP) 10-11s meeting of October 1993 in order to develop methods for interference calculation in response to a question from the Radiocom- munication Bureau (BR) (see Question ITU-R 223/11). The mandate of this group was extended during the JWP 10-1 1 S me
9、eting of November-December 1994 in order to cover also the compatibility between broadcasting-satellite service (BSS) transmissions in Appendices S30/30 and S30A/30A of the Radio Regulation (RR) guardbands with space operation service, and the technical feasibility to extend the application of RR No
10、. S5.492 to Regions 1 and 3 Plans for the introduction of fixed-satellite service (FSS) carriers in these Plans. The different tasks entrusted to this group are presented in Annex B to Annex 4 to Doc. 10-1 1S/1 (Chairmans Report, 31 October 1995). The purpose of this Report is to present the new res
11、ults of the work made by some participants to the group since December 1994, to summarize the result of these studies and to elaborate a draft new Recommendation proposing updated criteria and associated methods to be taken into account for the future revision of RR Appendices S30/30 and S30Af30A Pl
12、ans of Regions 1 and 3. Section 2 presents the current protection ratios (PRs) of RR Appendix 30 and describes the methodologies applied by the BR to assess the interference situation between analogue or digital assignments. This section includes the description of the provisional model provided to
13、the BR in October 1993 by JWP 10-1 1s in order to assess interference from digital carriers into standard analogue carriers. In addition, new considerations are presented on the assumptions made to implement this model in the ITU MSPACE software. Reference is also made to a new general interference
14、calculation method which allows the calculations to be performed for different frequency offsets and different wanted and inter- fering signal types, based on a set of PR masks (see Doc. 10-1 1989 - Protection masks and associated interference calculation methods for the BSS Plans, 7 October 1996 an
15、d Doc. 10-1 lS/TEMP/l; Preliminary Draft Recommen- dation ITU-R BO.M1 i - Protection masks and associated interference calculation methods to be used in Appendices 30 and 30A BSS Plans of the Radio Regulations, October 1996). Section 3 presents the main results of the different contributions receive
16、d up to now on interference calculation between BSS carriers (see Doc. 10-1191, Chairmans Report, Annexes 1 and 2 to Attachment 2, 31 October 1995; Doc. 10-1 1S/27 - Measured protection ratios for PAL FM television interference into digital television transmissions in the BSS band, 21 March 1996; Fr
17、ances contribution to the Rapporteurs Group, 21 March 1996; Doc. 10-1 1984 - Technical parameters for the modernization of the WARC-BS Plan, 4 October 1996; Doc. 10-1 1S/57 (Add. 1) - Further modifications to Appendices 30/30A procedures not related to the simplification of the procedures, 11 Octobe
18、r 1996; Doc. 1O-llS/91 (Add. 1) - Thoughts and comments on a proposal for a protection ratio calculation method for narrow band digital satellite signals, 15 October 1996; Report ITU-R B0.634 - Broadcasting-satellite service (sound and television). Measured interference protection ratios for plannin
19、g television broadcasting systems, and Doc. 10-1 1 S82 - Liaison statement from WP 4A, 24 November 1994). * Note by the Secretariat: No. S5.492 of the Radio Regulations (edition of 1998), now in force, has replaced No. 846 ofthe Radio Regulation (edition of 1994). Section 4 presents preliminary resu
20、lts on sharing between BSS transmissions and space services based on the information available in the relevant Reports and contributions (see Report ITU-R B0.807 - Unwanted emissions from broadcasting-satellite space stations; Report ITU-R BO. 1076 - Considerations affecting the accommodation of spa
21、cecraft service functions (TTC) within the broadcasting-satellite and feeder-link service bands; Doc. i 0-1 i SA53 - Study of interference caused to a television channel by satellite telecommand carriers, 17 June 1981; Doc. 10-1 1W78 - European broadcast satellite services - considerations affecting
22、 the accomodation of spacecraft service function (TTC) within the broadcast-satellite frequency assignments, 23 September 198 1; Doc. 10-1 1 S/8 - Compatibility between space operating links and feeder-links to broadcasting satellites (protection ratio), 13 May 1983; Doc. 1O-llS/9 - Study of interfe
23、rence caused by television signals to space operation signals on broadcasting satellites in Regions 1 and 3, 13 May 1983; Doc. 10-1 1S/26 - Feasibility of collocating broadcasting satellites, 19 May 1983, and Doc. 10-1 1S/35 - Considerations affecting the accommodation of spacecraft service function
24、s (TCC) within the broadcast satellite service bands, 3 June 1983 and Corr. 1,6 September 1983). Section 5 presents preliminary information on the interference from FSS transmission into the BSS Plan assignments (seeRecommendation ITU-R S.483 - Maximum permissible level of interference in a televisi
25、on channel of a geostationary-satellite network in the fixed-satellite service employing fiequency modulation, caused by other networks of this service; Doc. 4A/TEMP/36 - Preliminary draft modification of Recommendation 483-2, 21 November 1994; Doc. 4A/TEMP/38 - Draft revision of Report 867 - Maximu
26、m permissible level of FM/TV interference in single-channel-per-carrier and intermediate rate digital transmissions in networks of the fixed-satellite service, 21 November 1994; Doc. 4A/TEMP/39 - Draft new Report - Interference from FDM/FM, QPSK and TV/FM signals into analogue TVRM signals, 21 Novem
27、ber 1994, and Doc. 1O-llS/45 - Use of BSS Plan Assignments for FSS transmissions, 29 August 1996). Section 6 presents the views of this Special Rapporteurs Group on the possible evolution of the existing PRs to be used in the future for the BSS Plans. 2 FU3 Appendices 30 and 30A protection ratios an
28、d methodology 2.1 Protection ratios and methodology applied prior to the World Radiocommunication Conference (Geneva 1997) (WRC-97) (see Note 1) NOTE i - See 9 2.2 for protection ratios and methodology applied following WRC-97 decisions. 2.1.1 Applicable PRs prior to WRC-97 The current PRs defined i
29、n RR Appendix 30 come fkom Q 3.1.1 of Report ITU-R B0.634 which presents the protection masks used for the planning of BSS Plans for Regions 1 and 3 (Fig. la, curve B of Report ITU-R B0.634) and Region 2 (Fig. 1 b of Report ITU-R B0.634). For Regions 1 and 3, PRs are: - 31 dB for the co-channel; - i
30、 5 dB for the lower and upper adjacent channels with 19.18 MHz centre frequency separation. These PRs correspond to standard PALJSECAM FM TV signals with fiequency deviation of 13.5 MW and energy dispersal of 600 kHz peak-to-peak. For Region 2, PRs are: - 28 dB for the co-channel; - 13.6 dB for the
31、first lower and the first upper adjacent channels with 14.58 MHz centre frequency separation; - -9.9 dB for the second lower and the second upper adjacent channels with 29.16 MHz centre frequency separation. These PRs correspond to standard NTSC FM TV signals with frequency deviation of 13.5 MHzN an
32、d energy dispersal of 600 kHz peak-to-peak. STDmITU-R RECMN BOmZOLS-ENGL 3999 W 4855232 053b833 09T W 3 Rep. ITU-R B0.2019 2.1.2 Calculation of equivalent protection margin/overall equivalent protection margin (EPM/OEPM) for cases involving only analogue signals For the assessment of the interferenc
33、e situation in Regions i and 3, the BR calculates EPM as follows: where: M, : co-channel margin = (C/Z)CC - PR, = (C/l)/ac - PRiac M/ac : lower adjacent channel margin Mua, : upper adjacent channel margin = (C4uac - PRuac where: PR, : co-channel protection ratio = 3 1 dB PRI, and PR, : (C/ are trans
34、mitted in the Plans of RR Appendices 30 and 30A with a squared shape bandwidth of B (MHz). Suppose that: - is the total power level of a new digital carrier; - b (ME) is the overlapping bandwidth of this digital carrier into a wanted analogue carrier bandwidth; - B is the necessary bandwidth of the
35、interfering carrier (DT), then the resulting interference created by a digital carrier into a wanted analogue carrier is assumed to be: i 15 dB (downlink) and 21 dB (feeder-link) lower and upper adjacent channel PRs in the case of 27 MHz frequency bandwidth and i 9.18 MHz centre frequency separation
36、 between adjacent channels. For the other assignments of type A or P (see Note 1): - 24 dB (downlink) and 30 dB (feeder-link) co-channel PRs; - 16 dB (downlink) and 22 dB (feeder-link) lower and upper adjacent channel PRs in the case of 27 MHz fi-equency bandwidth and 19.18 MHz centre frequency sepa
37、ration between adjacent channels. NOTE 1 - As defined in Articles 11 and 9A of Appendices S30 and S30A respectively. For the Region 2 Plan, the PRs were not modified by WRC-97 and thus remain those mentioned in 9 2.1.1 above in the case of 24 MHz frequency bandwidth and 14.58 MHz centre fiequency se
38、paration between adjacent channels. 2.2.2 Treatment of both analogue and digital signals For the assessment of the interference situation in the Regions 1 and 3 Plans, WRC-97 confirmed the use of the EPM calculation method. For the assessment of the interference situation in the Region 2 Plan, which
39、 was not on the agenda of WRC-97, the OEPM calculation method continues to be applicable. In adopting new versions of Annexes 5 and 3 to RR Appendices S30 and S30A respectively, WRC-97 instructed the Bureau to treat the assignments using bandwidths andor channel spacing differently from those specif
40、ied in these annexes (9 3.5.1 and 3.8 of Annex 5 and 0 1.7 of Annex 3) in accordance with applicable ITU-R Recommendations for protection masks, when available. Also, in the absence of such Recommendations, the Bureau shall use the worst-case approach as adopted by the Radio Regulations Board. In th
41、e case of interference from digital assignments using bandwidths and/or channel spacing different from those specified in these annexes, the Bureau has implemented the methodology described in 0 2.1.3 above, which is now also included in Annex 3 to Recommendation ITU-R BO. 1293. Annex 1 to Recommend
42、ation ITU-R BO. 1293 concerns the STD-ITU-R RECMN BO-SOLS-ENGL 1999 H Y855212 0536837 735 Rep. ITU-R B0.2019 7 calculation of protection masks for interference between various mes of digital carrier. At the May 1999 meeting of JWP 10-1 lS, this Recommendation was revised to include the effects of th
43、e non-linear transmission channel. Once approved in its revised form, the method of Annex 1 is recommended to replace the method of Annex 3 for calculations involving interference between digital emissions. Further information is given in Doc. 10-1 1 S/138 -Protection mask and associated calculation
44、 methods for interference into broadcast-satellite systems involving digital emissions, 1 O May 1999, on the effects of the non-linear channel and the revised calculation method. However, in the case of interference from analogue assignments using bandwidths and/or channel spacing different from tho
45、se specified in these annexes, the interference calculation methods used so far by the Bureau, in accordance with advice provided by JWP 10-1 1s (Note to the Director, Radiocommunication Bureau, November 1994), as mentioned in 8 2.1.3 above, is not the worst-case approach as required by WRC-97 and m
46、ay lead to the following undesirable results: - completely ignoring interference in Regions 1 and 3 Plans when the assigned (centre) frequency of the interfering emission falls in the second adjacent channel as shown in Fig. 1 (cases 1.1, 1.2 and 1.3) of Annex 2 to Doc. 10-1 1S/66 - Interference cal
47、culation method with respect to sections 3.5.1 and 3.8 of Annex 5 to Appendix 30/530 (WRC-97) and section 1.7 of Annex 3 to Appendix 30NS30A (WRC-97), 28 September 1998; - calculation of the interference in cases where there is no overlap as shown in Fig. 2 (cases 2.1, 2.2 and 2.3) of Annex 2 to Doc
48、. 10-1 i S/66; - overestimating the interference level as shown in Fig. 3 (cases 3.2 and 3.3) of Annex 2 to Doc. 10-1 1S/66; - underestimating the interference level as shown in Fig. 3 (case 3.1) of Annex 2 to Doc. 10-1 1S/66. The Radio Regulations Board at its 12Ih Meeting (20-24 April 1998) has ad
49、opted new Rules of Procedure relating to 5 3.5.1 and 3.8 of Annex 5 to RR Appendix S30 and 1.7 of Annex 3 to RR Appendix S30A, in order to allow the Bureau to treat Article 4 submissions with parameters different from those described in Annexes 5 and 3 to RR Appen- dices S30 and S30A. These new Rules contain references to the worst-case approach described below (see also Annex 1 to Doc. 10-1 1S/66). This worst-case approach will be applied provisionally for all Regional BSS Plans to deal with interference from analo_eue assignments until the relevant ITU-R R
