ITU-R BS 1660-7-2015 Technical basis for planning of terrestrial digital sound broadcasting in the VHF band《地面数字声音广播甚高频(VHF)系统计划的技术基础》.pdf
《ITU-R BS 1660-7-2015 Technical basis for planning of terrestrial digital sound broadcasting in the VHF band《地面数字声音广播甚高频(VHF)系统计划的技术基础》.pdf》由会员分享,可在线阅读,更多相关《ITU-R BS 1660-7-2015 Technical basis for planning of terrestrial digital sound broadcasting in the VHF band《地面数字声音广播甚高频(VHF)系统计划的技术基础》.pdf(67页珍藏版)》请在麦多课文档分享上搜索。
1、 Recommendation ITU-R BS.1660-7 (10/2015) Technical basis for planning of terrestrial digital sound broadcasting in the VHF band BS Series Broadcasting service (sound) ii Rec. ITU-R BS.1660-7 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, 2015 ITU 2015 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 BS.1660-7 1 RECOMMENDATION ITU-R BS.1660-7* Technical basis for planning of terrestrial digital sound broadcasting in the VHF band (Question ITU-R 56/6) (2003-2005-2005-2006-2011-2012-2015) Scope This R
9、ecommendation describes the planning criteria, which could be used for planning of terrestrial digital sound broadcasting in the VHF band, for Digital Systems A, F and G of Recommendation ITU-R BS.1114. The ITU Radiocommunication Assembly, considering a) Recommendations ITU-R BS.774 and ITU-R BS.111
10、4; b) ITU-R Digital Sound Broadcasting Handbook Terrestrial and satellite digital sound broadcasting to vehicular, portable and fixed receivers in the VHF/UHF bands, recommends 1 that the planning criteria as described in Annex 1 for Digital System A and Annex 2 for Digital System F and Annex 3 for
11、Digital System G could be used for planning of terrestrial digital sound broadcasting in the VHF band. Annex 1 Technical basis for planning of terrestrial digital sound broadcasting System A (T-DAB) in the VHF band 1 General This Recommendation contains relevant T-DAB system parameters and network c
12、oncepts, including a description of single frequency networks (SFNs). The receiving antenna, which is assumed to be representative for mobile and portable reception, has a height of 1.5 m above ground level, omnidirectional with a gain slightly lower than a dipole. The field strength prediction meth
13、od relies on curves for 50% locations, 50% time for the wanted signal and 50% locations, 1% time for the unwanted signal. For the calculation of tropospheric (1% time) and continuous (50% time) interference, see Recommendation ITU-R BT.655. * The Administration of the Syrian Arab Republic is not in
14、a position to accept the content of this Recommendation, nor for it to be used as a technical basis for the planning of sound broadcasting in the VHF band, at the forthcoming Regional Radiocommunication Conferences planning of the digital terrestrial broadcasting service in parts of Regions 1 and 3.
15、 2 Rec. ITU-R BS.1660-7 The required location percentage for T-DAB services is 99%. Therefore, taking a standard deviation of 5.5 dB, an increase of 13 dB (2.33 5.5 dB) shall be applied to the field strength values (50% locations) in order to obtain the 99% location values required for planning a T-
16、DAB service. The propagation curves used for planning relate to a receiving antenna height of 10 m above ground, whereas a T-DAB service will be planned primarily for mobile reception, i.e., with an effective receiving antenna height of about 1.5 m. An allowance of 10 dB is necessary to convert the
17、minimum required T-DAB field strength at a vehicle antenna height of 1.5 m to the equivalent value at 10 m. 2 Minimum wanted field strength used for planning Table 1 contains values for VHF Band III with the inclusion of a correction of 13 dB for location percentage and of 10 dB for height gain. The
18、 below given minimum median equivalent field strength represents the minimum wanted field strength used for planning. The values shown in Table 1 are applied to mobile reception. TABLE 1 Minimum median equivalent field strength (dB(V/m) at an antenna height of 10 m Frequency band Band III Minimum eq
19、uivalent field strength (dB(V/m) 35 Location percentage correction factor (50% to 99%) (dB) +13 Antenna height gain correction (dB) +10 Minimum median equivalent field strength for planning (dB(V/m) 58 3 Unwanted emissions 3.1 Spectrum masks for T-DAB out-of-band emissions The out-of-band radiated s
20、ignal in any 4 kHz band should be constrained by one of the masks defined in Fig. 1. The solid line mask should apply to VHF transmitters operating in critical cases. The dashed line mask should apply to VHF transmitters operating in uncritical cases or in the 1.5 GHz band and the dotted line mask s
21、hould apply to VHF transmitters operating in certain areas where frequency block 12D is used. The level of the signal at frequencies outside the normal 1.536 MHz bandwidth can be reduced by applying an appropriate filtering. Rec. ITU-R BS.1660-7 3 FIGURE 1 Out-of-band spectrum masks for a transmissi
22、on signal of System A BS .1660-01100908070605052454030201001009050784030201002656607071801061 101201261303 2 1 1 2 3f00.772.5 1.5 0.5 0.5 1.5 2.52.21.750.970.770.971.752.2Ratioofout-of-bandpowermeasuredin4kHzbandwidthtoin-bandpowermeasuredin4kHzbandwidth(dB)Ratioofout-of-bandpowermeasuredin4kHzbandw
23、idthtototalpowerin1.5MHzofaSystemAblock(dB)F r e que nc y di f f e r e nc e f r om c e nt r e f r e que nc y ( M H z )S pe c t r um m a s k f or V H F S ys t e m A t r a ns m i t t e r s ope r a t i ng i n unc r i t i c a l c a s e sor i n t he 1.5 G H z ba ndS pe c t r um m a s k f or V H F S ys t
24、e m A t r a ns m i t t e r s ope r a t i ng i n c r i t i c a l c a s e sS pe c t r um m a s k f or V H F S ys t e m A t r a ns m i t t e r s ope r a t i ng i n c e r t a i n a r e a s w he r ef r e que nc y bl oc k 12D i s us e d4 Rec. ITU-R BS.1660-7 Out-of-band spectrum table for a transmission s
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ITURBS166072015TECHNICALBASISFORPLANNINGOFTERRESTRIALDIGITALSOUNDBROADCASTINGINTHEVHFBAND 地面 数字 声音 广播

链接地址:http://www.mydoc123.com/p-790324.html