ITU-R F 385-10-2012 Radio-frequency channel arrangements for fixed wireless systems operating in the 7 110-7 900 MHz band《运行于7110-7900 MHz频段的固定无线系统的射频信道配置》.pdf
《ITU-R F 385-10-2012 Radio-frequency channel arrangements for fixed wireless systems operating in the 7 110-7 900 MHz band《运行于7110-7900 MHz频段的固定无线系统的射频信道配置》.pdf》由会员分享,可在线阅读,更多相关《ITU-R F 385-10-2012 Radio-frequency channel arrangements for fixed wireless systems operating in the 7 110-7 900 MHz band《运行于7110-7900 MHz频段的固定无线系统的射频信道配置》.pdf(12页珍藏版)》请在麦多课文档分享上搜索。
1、 Recommendation ITU-R F.385-10(03/2012)Radio-frequency channel arrangements for fixed wireless systems operating in the 7 110-7 900 MHz bandF SeriesFixed serviceii Rec. ITU-R F.385-10 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and economical us
2、e 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 World an
3、d 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 used for th
4、e 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. Series of I
5、TU-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, radiodetermination
6、, 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 Satellite n
7、ews 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, 2012 ITU 2012 All rights reserved. No part of this publication
8、may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R F.385-10 1 RECOMMENDATION ITU-R F.385-10 Radio-frequency channel arrangements for fixed wireless systems operating in the 7 110-7 900 MHz band (Question ITU-R 247/5) (1959-1963-1978-1982-1986-1990-1992-1994-200
9、1-2005-2007-2012) Scope This Recommendation provides RF channel arrangements for fixed wireless systems (FWSs) operating in the 7 GHz band. The main text of as well as Annexes 1 to 5 to this Recommendation present a number of RF arrangements with channel separation of 3.5, 5, 7, 14, and 28 MHz (incl
10、uding the possible use of 2 28 MHz adjacent channels) in the frequency range 7 110-7 900 MHz. The ITU Radiocommunication Assembly, considering a) that FWSs at data rates up to 155 Mbit/s, including synchronous digital hierarchy bit rates, may operate in the 7 GHz band; b) that frequency bands 300 MH
11、z wide may be available for such systems; c) that the availability of frequency bands in the range from 7 110 MHz to 7 990 MHz differs in various countries; d) that economy may be achieved if several go and return channels are connected to one common transmit-receive antenna; e) that many interferin
12、g effects can be minimized by a carefully planned arrangement of the radio frequencies in FWSs employing several RF channels; f) that digital techniques such as cross-polar interference cancellers (XPIC) may significantly contribute to the cross-polar discrimination improvement factor (XIF, defined
13、in Recommendation ITU-R F.746), thus counteracting multipath propagation-induced depolarization; g) that, when very high capacity links (e.g. twice Synchronous Transfer Mode-1(STM-1) are required, further economy may be achieved using system bandwidths wider than the recommended channel separation,
14、associated to high efficient modulation formats, recommends 1 that the preferred RF channel arrangement for several FWSs, operating in the 7 GHz band, should be derived as follows (see Fig. 1 and Note 1): Let 0f be the frequency of the centre of the band of frequencies occupied (MHz); nf be the cent
15、re frequency of one RF channel in the lower half of this band (MHz); nf be the centre frequency of one RF channel in the upper half of this band (MHz), then the frequencies (MHz) of the individual channels with 7 MHz channel separation are expressed by the following relationships (see Fig. 1a): lowe
16、r half of the band: nffn71540+= upper half of the band: nffn770+= 2 Rec. ITU-R F.385-10 where: n = 1, 2, 3, ., 20; the frequencies (MHz) of the individual channels with 14 MHz channel separation are expressed by the following relationships (see Fig. 1b): lower half of the band: nffn145.1570+= upper
17、half of the band: nffn145.30+= where: n = 1, 2, 3, ., 10; the frequencies (MHz) of the individual channels with 28 MHz channel separation are expressed by the following relationships (see Fig. 1c): lower half of the band: nffn285.1640+= upper half of the band: nffn285.30+= where: n = 1, 2, 3, 4 and
18、5; Rec. ITU-R F.385-10 3 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; 3 that for international connections, the centre frequency should preferably b
19、e: f0= 7 575 MHz for the band 7 425 to 7 725 MHz; in addition, other centre frequencies may be used in certain geographical areas by agreement between the administrations concerned, e.g.: f0= 7 275 (for the band 7 125 to 7 425 MHz), 7 400 (for the band 7 250 to 7 550 MHz) or 7 700 MHz (for the band
20、7 550 to 7 850 MHz) (see Note 2); 4 that the actual channel arrangement and antenna polarization should be agreed between the administrations concerned; 5 that Annexes 1 to 5 provide RF channel arrangements which may be considered for use by administrations; 6 that, when very high capacity links are
21、 required and network coordination permits, with the agreement of the administrations concerned, the use of any two adjacent 28 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 MHz adja
22、cent channels; NOTE 1 Care should be taken to the outermost channels that might exceed the band limits. NOTE 2 The RF channel arrangement with f0= 7 700 MHz overlaps some of the channel arrangements mentioned in Recommendation ITU-R F.386. Annex 1 RF channel arrangement in the bands 7 125-7 425 MHz
23、and 7 425-7 725 MHz 1 This Annex describes a RF channel arrangement for low, medium and high capacity digital FWSs, operating in the bands 7 125-7 425 MHz and 7 425-7 725 MHz. The RF channel arrangement is shown in Fig. 2 and is derived as follows: Let f0be the frequency of the centre of the band of
24、 frequencies 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 (MHz) of the individual channels, with duplex separation of 154 MHz, are expressed by t
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