1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-19385-0 SANS 300473:2007Edition 2EN 300473:1997Edition V1.1.2SOUTH AFRICAN NATIONAL STANDARD Digital Video Broadcasting (DVB); Satellite M
4、aster Antenna Television (SMATV) distribution systems This national standard is the identical implementation of EN 300473:1997 and is adopted with the permission of the European Telecommunications Standards Institute. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191
5、pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 300473:2007 Edition 2 EN 300473:1997 Edition V1.1.2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee StanSA
6、 TC 74, Communication technology, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This standard was published in April 2007. This SANS edition supersedes the first SABS edition (SABS ETS 300473:1995). European Standard (Telecommunications
7、 series) Digital Video Broadcasting (DVB); Satellite Master Antenna Television (SMATV) distribution systems European Broadcasting Unio Union Europeenne de Radio-Television European Telecommunications Standards Institute Reference RENIJTC-OODVB-48 (4doOOidc.PDF) Keywords DVB. diaital, video. broadcas
8、tina. MPE ETSI Secretariat Postal address F-06921 Sophia Antipolis Cedex - FRANCE Office address 650 Route des Lucioles - Sophia Antipolis Valbonne - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret No 348 623 562 00017 - NAF 742 C Association a but non lucratif enregistree a la Sous-Pref
9、ecture de Grasse (06) No 7803188 X.400 c= fr; a=atlas; p=etsi; ssecretariat Internet secretariat etsi.fr http:/www.etsi.fr Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. O E
10、uropean Telecommunications Standards Institute 1997 O European Broadcasting Union 1997. All rights resenfed. Contents Intellectual Property Rights 4 Foreword 4 1 Scope 5 2 Normative references . 5 Symbols and abbreviations 6 Symbols . 6 Abbreviations . 6 SMATV distribution system concepts . 7 . SMAT
11、V System A 8 Full implementation of SMATV System A 8 Simplified implementation of SMATV System A 8 SMATV System B . 10 SMATV-IF 11 SMATV-S 11 . MPEG-2 transport layer 11 Framing structure . 11 Annex A (informative): Channel model of SMATV distribution systems 12 A . 1 Channel model response 12 A.2 D
12、efinition of adaptive equalization requirements 12 . Annex B (informative): Examples of 64-QAM and QPSK performance with equalizers 15 B . 1 SMATV System A . Simulation results . 15 B.2 SMATV System B . Simulation results . 16 Annex C (informative): Bit rate consideration for SMATV distribution syst
13、ems . 20 Annex D (Informative): Bibliography . 22 History 23 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs. if any. is publicly available for ETSI members and non-members
14、. and can be found in ETR 3 14: “I?tellectual Property Riglzts (IPRs); Esseiztial, or poreztiall Esseiltial. IPRs izat$ed to ETSI iiz respect of ETSI standards“. which is afailable free of charge from the ETSI Secretariat. Latest updates are available on the ETSI Web senler (http:/www.etsi.fr/ipr).
15、Pursuant to the ETSI Interim IPR Policy, no investigation. including IPR searches. has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETR 3 14 (or the updates on http:/nrww.etsi.fr/ipr) which are, or may be, or may become. essential to the pre
16、sent document. Foreword This second edition. previously as an ETS now an EN. contains changes of an entirely editorial nature as follows: 1) add the DVB logo to the front page of the deliverable; 2) change the title from: “Digital broadcasting systems for television, sound and data services: etc.“ t
17、o “Digital Video Broadcast (DVB): etc.“: 3) add in the foreword the DVB acknowledgement. This European Standard (Telecommunications series) has been produced by the Joint Technical Committee (JTC) of the European Broadcasting Union (EBU). ComitC EuropCen de Normalisation ELECtrotechnique (CENELEC) a
18、nd the European Telecommunications Standards Institute (ETSI). NOTE: The EBUJETSI JTC was established in 1990 to co-ordinate the drafting of standards in the specific field of broadcasting and related fields. Since 1995 the JTC became a tripartite body by including in the Memorandum of Understanding
19、 also CENELEC. which is responsible for the standardization of radio and television receivers. The EBU is a professional association of broadcasting organizations whose work includes the co-ordination of its members activities in the technical. legal. programme-making and programme-exchange domains.
20、 The EBU has active members in about 60 countries in the European broadcasting area: its headquarters is in Geneva *. “uropean Broadcasting Union Case Postale 67 CH- 12 18 GRAND SACONNEX (Geneva) Switzerland Tel: +412271721 11 Fax: +41 227172481 Digital Video Broadcasting (DVB) Project Founded in Se
21、ptember 1993. the DVB Project is a market-led consortium of public and private sector organizations in the television industrp. Its aim is to establish the framework for the introduction of MPEG-2 based digital telelision senlices. Now comprising over 200 organizations from more than 25 countries ar
22、ound the world. DVB fosters market- led systems. which meet the real needs. and economic circumstances. of the consumer electronics and the broadcast industry. Proposed national transposition dates Date of adoption of ETS 300 473: 26 December 1994 Date of latest announcement of ETS 300 473 (doa): 31
23、 August 1995 Date of latest publication of new National Standard or endorsement of ETS 300 473 (dopte): 29 February 1996 Date of withdrawal of any conflicting National Standard (dow): 29 February 1996 Scope The present document describes the transmission system proposal for digital multi-programme t
24、elevision suitable for distribution in Satellite Master Antenna Television (SMATV) systems. The present document is complementary to the EN 300 429 I and it is aligned with EN 300 421 2. The System described in the present document is compatible with the modulation and channel coding systems used fo
25、r digital multi-programme television by cable and satellite transmissions (see EN 300 429 I and EN 300 421 2. respectively). The System described in the present document is based on the MPEG-2 System Layer. see ISO/IEC DIS I381 8-1 3. with the addition of appropriate Forward Error Correction (FEC) t
26、echnique. The System described in the present document allows for further eolution as technology advances as described in document EN 300 429 I and is capable of starting a reliable service as of now (see also annex D. bibliography). 2 Normative references References may be made to: a) specific vers
27、ions of publications (identified by date of publication. edition number, version number. etc.). in which case. subsequent revisions to the referenced document do not apply: or b) all versions up to and including the identified version (identified by “up to and including“ before the version identity)
28、: or C) all versions subsequent to and including the identified version (identified by “onwards“ following the version identity): or d) publications without mention of a specific version. in which case the latest version applies. A non-specific reference to an ETS shall also be taken to refer to lat
29、er versions published as an EN with the same number. 1 1 EN 300 439: “Digital Video Broadcasting (DVB): Framing structure. channel coding and modulation for cable systems“. PI EN 300 421: “Digital Video Broadcasting (DVB): Framing structure. channel coding and modulation for 1 111 2 GHz satellite se
30、rvices“. E31 ISO/IEC DIS 13818-1 (1994): “Coding of moving pictures and associated audio“. 41 Forney. G.D. IEEE Trans. Comm. Tech COM- 19. pp. 772-78 1. (October 197 1 ): “Burst-correcting codes for the classic bursty channel“. Symbols and abbreviations Symbols For the purposes of the present docume
31、nt. the following symbols apply: cc roll-off factor fo channel centre frequency R symbol Rate corresponding to the bilateral Nyquist bandwidth of the modulated signal R useful bit Rate after MPEG-2 transport multiplexer Rl bit Rate after RS outer coder T number of bytes which can be corrected in RS
32、error protected packet Ts symbol period Abbreviations For the purposes of the present document, the following abbreviations apply: BB BER BW CIN DTVC DVB ETS FEC FIR IF IRD LNB LSB MPEG MSB MUX PDH PRBS QAM QEF QPSK RF RS SMATV SMATV-DTM SMATV-IF SMATV-S TDL TDM TDT TV UHF VHF BaseBand Bit Error Rat
33、io Bandwidth Signal-to-Noise ratio Digital Television by Cable Digital Video Broadcasting European Telecommunication Standard Forward Error Correction Finite Impulse Response Intermediate Frequency Integrated Receiver Decoder Low Noise Block Least Significant Bit Moving Pictures Experts Group Most S
34、ignificant Bit Multiplex Plesiochronous Digital Hierarchy Pseudo Random Binary Sequence Quadrature Amplitude Modulation Quasi Error Free Quaternary Phase Shift Keying Radio Frequency Reed-Solomon Satellite Master Antenna Television (as defined in clause 4) SMATV system based on Digital TransModulati
35、on SMATV system based on distribution at IF SMATV system based on distribution at extended Super band Tapped Delay Line Time Division Multiplex Transparent Digital Transmodulation Television Ultra High Frequency Very High Frequency SMATV distribution system concepts A Satellite Master Antenna Televi
36、sion (SMATV) system is defined as a system which is intended for the distribution of television and sound signals to households located in one or more adjacent buildings. These signals are received by a satellite receiving antenna and may be combined with terrestrial TV signals. SMATV distribution s
37、ystems are also known as community antenna installations or domestic TV cable networks. A SMATV system represents a means for sharing the same resources among several users for satellite and terrestrial reception. The SMATV System is designed to perform the adaptation of the satellite TV signals to
38、the SMATV channel characteristics. The primary consideration of the SMATV System is the transparency of the SMATV head-end to the digital TV multiplex from a satellite reception without baseband interfacing. delivering that signal to the user home Integrated Receiver Decoder (IRD): thus permitting s
39、imple and cost effective head-end as required for the consumer profile of SMATV equipment. The present document considers two main SMATV System approaches for distribution of digital TV signals in SMATV installations. as follows: ShlATV System A The System A approach consists of the transmodulation
40、from satellite Quaternary Phase Shift Keying (QPSK) signals as defined in EN 300 421 2 to a Quadrature Amplitude Modulation (QAM) scheme (16-QAM. 32-QAM or 64-QAM) using either: a.1 ) a full implementation of the System described in EN 300 429 I (see subclause 5.1): or a.2) a simplified transmodulat
41、ion process as described in subclause 5.2 of the present document. This process of transmodulation without baseband interfacing is also known as “Transparent Transmodulation“. SMATV System B The System B approach consists of direct distribution of QPSK satellite signals as defined in EN 300 421 2 us
42、ing frequency conversion of the received satellite signal to a frequency band appropriate to the characteristics of the distribution network. The use of one of the System A or System B approaches depends on the technical performance and cost trade-offs in each particular situation. NOTE: Digital ter
43、restrial specification is not the subject of the present document. SMATV System A SMATV System A is based on the use of the transmodulation from satellite QPSK signals to a QAM modulation scheme (see figure 1). This system is also known as SMATV-DTM. The System comprises the following elements: - He
44、ad-end transmodulation unit: this performs the required decoding and adapts the signal modulation coding to the cable distribution network. This unit is also known as the Transparent Digital Transmodulator (TDT). - SMATV UHF distribution network: this is a physical cable structure for distribution o
45、f the signal to several users. The reference channel response of SMATV distribution network is given in annex A. - User IRD: this unit performs the required equalization to compensate the channel distortion as well as demodulating and decoding the QAM signal. 5.1 Full implementation of SMATV System
46、A A full implementation of the QAM System shall be performed according to EN 300 429 1 and EN 300 421 2 with a transparent interface between them. To this end. the full implementation of SMATV System A shall make use of the MPEG-2 transport layer. the framing structure. the channel coding. the byte-
47、to-symbol mapping and modulation consistent with EN 300 429 I and EN 300 42 1 2. The channel coding shall include the randomization for spectrum shaping. the Reed-Solomon (RS) coding and the convolutional interleaving according to Forney 4. This configuration is shown in figure 2. 5.2 Simplified imp
48、lementation of SMATV System A In the complete implementation architecture of SMATV System A. outer error protection (i.e. RS and conolutional interleaving) is performed twice. i.e. independently for the satellite link and the cable link. Therefore. the cable link is fed by a Quasi Error Free (QEF) b
49、it stream. In cases when an adequate satellite link margin is achieved. one RS decoder-encoder and deinterleaving-interleaving process could be eliminated from the System. In such cases. a single RS decoder at the user IRD is capable of correcting errors generated in the cable link added to the remaining burstly errors after Viterbi decoding. This configuration is shown in figure 2 when removing the dashed line blocks. NOTE: This simplified configuration may imply a non-negligible saving in terms of the number of gates and thus in the total
copyright@ 2008-2019 麦多课文库（www.mydoc123.com）网站版权所有
备案/许可证编号：苏ICP备17064731号-1