1、 Recommendation ITU-R F.386-9(02/2013)Radio-frequency channel arrangements forfixed wireless systems operating in the 8 GHz (7 725 to 8 500 MHz) bandF SeriesFixed serviceii Rec. ITU-R F.386-9 Foreword 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
3、World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be use
4、d for the submission of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found. Ser
5、ies of ITU-R Recommendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed service M Mobile, radiodeter
6、mination, amateur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems SM Spectrum management SNG Sat
7、ellite news gathering TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2013 ITU 2013 All rights reserved. No part of this publ
8、ication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R F.386-9 1 RECOMMENDATION ITU-R F.386-9 Radio-frequency channel arrangements for fixed wireless systems operating in the 8 GHz (7 725 to 8 500 MHz) band (Question ITU-R 247/5) (1963-1966-1982-1986-1992-1
9、997-1999-2007-2013) Scope This Recommendation provides radio-frequency channel arrangements for fixed wireless systems operating in the 8 GHz (7 725 to 8 500 MHz) band, which may be used for high, medium and low capacity systems. The preferred radio-frequency channel arrangements are based on multip
10、les of basic slots either of 3.5 MHz or 2.5 MHz width. Examples in various segments of the 8 GHz band are presented in Annexes 1 to 5. Annex 6 presents an arrangement for high capacity digital systems used in some countries. The ITU Radiocommunication Assembly, considering a) that it may be desirabl
11、e to be able to interconnect fixed wireless systems (FWSs) on international links at radio frequencies in the 8 GHz band; b) that the availability of frequency bands in the range from 7 725 MHz to 8 500 MHz differs in various countries; c) that, for some administrations, a frequency band, only 300 M
12、Hz wide or less, may be available in the 8 GHz range for such systems; d) that some channel arrangements have been developed in the past based on analogue system requirements only; e) that it is desirable to deploy in such a band digital systems of low, medium and/or high capacity. In some countries
13、, analogue systems are still being used; f) that digital systems are mostly designed to accommodate radio-frequency (RF) channel arrangements based on multiples of 2.5 MHz or 3.5 MHz patterns; g) that, digital techniques such as cross-polar interference cancellers (XPIC) may significantly contribute
14、 to the cross-polar discrimination improvement factor (XIF, defined in Recommendation ITU-R F.746), thus counteracting multipath or rain propagation-induced depolarization; h) that, when very high capacity links (e.g. twice Synchronous Transfer Mode-1 (STM-1) are required, further economy may be ach
15、ieved using system bandwidths wider than the recommended channel separation, associated to high-efficient modulation formats, recommends 1 that the preferred RF channel arrangements be based on multiples of basic bandwidths of either 3.5 MHz or 2.5 MHz; examples in various segments of the 8 GHz band
16、 are shown in Annexes 1 to 5; 2 that, in a section over which the international connection is arranged, all the go channels should be in one half of the band, and all the return channels should be in the other half of the band; 2 Rec. ITU-R F.386-9 3 that, for adjacent RF channels in the same half o
17、f the band, horizontal and vertical polarization may be used alternately, as well as co-channel arrangements, provided that sufficient adjacent channel rejection is provided; 4 that when very high capacity links are required and network coordination permits, with the agreement of the administrations
18、 concerned, the use of any two adjacent 28 or 29.65 MHz channels specified in recommends 1 is possible, for wider bandwidth system, with centre frequency lying in the central point of the distance between the two 28 or 29.65 MHz adjacent channels; 5 that due regard be taken of the fact that, in some
19、 countries, in the 7 725 MHz to 8 275 MHz band, another RF channel arrangement for high capacity digital systems up to 140 Mbit/s or synchronous digital hierarchy bit rates is used. A description of this RF channel arrangement is given in Annex 6. Administrations currently using channel arrangements
20、 based on the 29.65 MHz raster are encouraged, in the future, to migrate to this more efficient 28 MHz and sub-multiples channel arrangement in Annex 2. Annex 1 RF channel arrangements for the transmission of various digital signals operating in the 7 725-8 275 MHz band, with 300 MHz duplex spacing,
21、 based on multiples of 2.5 MHz bandwidth referred to in recommends 1 This Annex describes an RF channel arrangement for low, medium and high capacity point-to-point FWS using digital modulation and operating in the band 7 725-8 275 MHz. Channel pairs are provided with a common transmit-receive separ
22、ation of 300 MHz. 1 The RF channel arrangement is shown in Fig. 1 and is derived as follows: Let f0be the frequency at the centre of the band: f0= 8 000 MHz fnbe the centre frequency of one RF channel in the lower half of the band (MHz); nf be the centre frequency of one RF channel in the upper half
23、 of the band (MHz), then the centre frequencies of the individual channels are expressed by the following relationships: 1.1 for systems with a 30 MHz channel bandwidth: lower half of the band: fn= f0 290 + 30 n MHz upper half of the band: nf = f0+ 10 + 30 n MHz where: n = 1, 2, 3, 8; 1.2 for system
24、s with a 20 MHz channel bandwidth: lower half of the band: fn= f0 285 + 20 n MHz upper half of the band: nf = f0+ 15 + 20 n MHz where: n = 1, 2, 3, 12; Rec. ITU-R F.386-9 3 1.3 for systems with a 10 MHz channel bandwidth: lower half of the band: fn= f0 280 + 10 n MHz upper half of the band: nf = f0+
25、 20 + 10 n MHz where: n = 1, 2, 3, 25. FIGURE 1 RF channel arrangements for the band 7 725-8 275 MHz (All frequencies in MHz) F.0386-01 275 275f0= 8 0001 234 5678 1 2 3 4 5 6 7 830 9080203003006010Channel numbers = 1, 2, 3, .8 and 1 , 2 , 3 , . 8 Channel numbers = 1, 2, 3, .12 and 1 , 2 , 3 , . 12 C
26、hannel numbers = 1, 2, 3, .25 and 1 , 2 , 3 , . 25 1 2345678910112 1 2 3 4 5 6 7 8 9 10 11 121234 25 1 2 3 4 253002 Low capacity systems with RF channel bandwidths of 1.25 MHz, 2.5 MHz and 5 MHz may also be utilized by subdividing the 10 MHz RF bandwidth pattern shown in Fig. 1. 4 Rec. ITU-R F.386-9
27、 Annex 2 RF channel arrangements for digital FWS operating in the 7 725-8 275 and 8 275-8 500 MHz bands based on multiples of 3.5 MHz bandwidth referred to in recommends 1 1 Channel arrangement in the frequency band 7 725-8 275 MHz The RF channel arrangement, in a frequency band of 275 MHz across th
28、e centre frequency 8 000 MHz for up to nine go and nine return channels, each accommodating high capacity digital systems operating in the 8 GHz band, is as shown in Fig. 2. Narrower channels, 18 channels 14 MHz wide and 36 channels 7 MHz wide, can be obtained by subdivision of the 28 MHz main chann
29、els. Channel pairs are provided with a common transmit-receive separation of 283.5 MHz. The channels centre frequencies are derived as follows: Let f0be the frequency of the centre of the band of frequencies occupied (MHz); fn be the centre frequency of one RF channel in the lower half of this band
30、(MHz); nf be the centre frequency of one RF channel in the upper half of this band (MHz). The centre frequency should be: f0= 8 000 MHz then the frequencies (MHz) of individual channels are expressed by the following relationships: 1.1 28 MHz channel arrangement The frequencies of the individual cha
31、nnels are expressed by the following relationships: lower half of the band: fn= f0 281 + 28 n MHz upper half of the band: nf = f0+ 2.5 + 28 n MHz where: n = 1, 2, 3, 4, 5, 6, 7, 8 or 9. FIGURE 2 RF channel arrangements for digital FWS operating in the 7 725-8 275 MHz band (All frequencies in MHz) F.
32、0386-0227513572468 1 53 72 64 8Channelnumber283.52859.5992227520.5V (H)H (V)8 0000= Rec. ITU-R F.386-9 5 1.2 14 MHz channel arrangement The frequencies of the individual channels are expressed by the following relationships: lower half of the band: fn= f0 274 + 14 n MHz upper half of the band: nf =
33、f0+ 9.5 + 14 n MHz where: n = 1, 2, 17 or 18. 1.3 7 MHz channel arrangement The frequencies of the individual channels are expressed by the following relationships: lower half of the band: fn= f0 270.5 + 7 n MHz upper half of the band: nf = f0+ 13 + 7 n MHz where: n = 1, 2, 35 or 36. 2 Channel arran
34、gement in the frequency band 8 2758 500 MHz The RF channel arrangements are shown in Fig. 3 (interleaved arrangements) and Fig. 4 (co-channel reusable arrangements) and are derived as follows: Let f0be the frequency of the centre of the band of frequencies occupied (MHz); fnbe the centre frequency o
35、f one RF channel in the lower half of the band (MHz); nf be the centre frequency of a RF channel in the upper half of the band (MHz); The centre frequency should be: f0= 8 387.5 MHz; then the frequencies (MHz) of individual channels are expressed by the following relationships: 2.1 Channel arrangeme
36、nts, based on interleaved centre frequencies In the interleaved channel arrangement shown in Fig. 3, adjacent RF channels on the same route can be used only on different polarization. 28 MHz interleaved channel arrangement with duplex spacing of 119 MHz The frequencies of the individual channels are
37、 expressed by the following relationships: lower half of the band: fn= f0 108.5 + 14 n MHz upper half of the band: nf = f0+ 10.5 + 14 n MHz where: n = 1, 2, 3, 4, 5, or 6; 6 Rec. ITU-R F.386-9 14 MHz interleaved channel arrangement with duplex spacing of 126 MHz The frequencies of the individual cha
38、nnels are expressed by the following relationships: lower half of the band: fn= f0 108.5 + 7 n MHz upper half of the band: nf = f0+ 17.5 + 7 n MHz where: n = 1, 2, 3, . . . 12. 2.2 Channel arrangements, based on co-channel reusable centre frequency When a channel arrangement permitting frequency reu
39、se is preferred, the channels should be derived from the above interleaved arrangement using only odd or even “n” indexes. The actual resulting arrangements are shown in Figs 4a) and 4b). FIGURE 3 RF channel arrangements for digital FWS operating in the 8 275-8 500 MHz band (interleaved pattern) (Al
40、l frequencies in MHz) F.0386-0349H(V)V(H)V(H)H(V)1424681012 2 4 12 6 8 10 11411357911 3 5 7 9 11 11494282316512 4 63 5182818f0112.5 112.5119126Rec. ITU-R F.386-9 7 FIGURE 4 RF channel arrangements for digital FWS operating in the 8 275-8 500 MHz band (frequency reuse pattern) (All frequencies in MHz
41、) F.0386-04H(V)V(H)V(H)H(V)11411357911 3 5 7 91863315 1 3 5322818f0112.5 112.5119126a) Odd channels arrangements1156H(V)V(H)V(H)H(V)214184681012 2468101163426 2 4 6182832f0112.5 112.5119126b) Even channels arrangements5612NOTE 1 When using in the same area channel 1 of the 28 MHz arrangements of the
42、 8 275-8 500 MHz band and channel 8 of the 29.65 MHz arrangement of the 7 725-8 275 MHz band in Annex 6, care should be taken to their separation of 26.43 MHz only, therefore, those two channels cannot be used on the same link. 8 Rec. ITU-R F.386-9 Annex 3 RF channel arrangements for digital FWS up
43、to 140 Mbit/s or synchronous digital hierarchy bit rates operating in the 7 900-8 400 MHz band, based on multiples of 3.5 MHz bandwidth referred to in recommends 1, with a channel separation of up to 28 MHz 1 This Annex describes a RF channel arrangement suitable for digital FWS up to 140 Mbit/s or
44、synchronous digital hierarchy bit rates operating in the 7 900-8 400 MHz band with a channel separation up to 28 MHz, and makes provision for eight 28 MHz channels. The RF channel arrangement is shown in Fig. 5 and is derived as follows: Let f0be the frequency of the centre of the band of frequencie
45、s occupied (MHz); fnbe the centre frequency of one RF channel in the lower half of the band (MHz); nf be the centre frequency of one RF channel in the upper half of the band (MHz); then the frequencies of individual 28 MHz channels are expressed by the following relationships, lower half of the band
46、: fn= f0 259 + 28 n MHz upper half of the band: nf = f0+ 7 + 28 n MHz where: n = 1, 2, 3, . . . 8. FIGURE 5 RF channel arrangement for digital FWS up to 140 Mbit/s or synchronous digital hierarchy bit rates operating in the 7 900-8 400 MHz band (All frequencies in MHz) F.0386-0515731 3 5 728462 4 6
47、8f0705002826122662 The eight channels with a separation of 28 MHz can be split to provide 16 channels with a separation of 14 MHz or 32 channels with a separation of 7 MHz. Rec. ITU-R F.386-9 9 The frequencies of individual channels are expressed by the following relationships: 2.1 for 14 MHz channe
48、ls: lower half of the band: fn= f0 259 + 14 n MHz upper half of the band: nf = f0+ 7 + 14 n MHz where: n = 1, 2, 3, . . . 16. 2.2 for 7 MHz channels: lower half of the band: fn= f0 252 + 7 n MHz upper half of the band: nf = f0+ 14 + 7 n MHz where: n = 1, 2, 3, . . . 32. 3 The centre frequency f0is 8
49、 157 MHz. Annex 4 RF channel arrangements for the transmission of various digital signals operating in the 7 725-8 275 MHz band based on multiples of 2.5 MHz bandwidth referred to in recommends 1 1 This Annex describes an RF channel arrangement suitable for the transmission of various digital signals operating in the 7 725-8 275 MHz band with a channel separation of 40, 20, 10 and 5 MHz. The RF channel arrangement is shown in
