1、 STD-ETSI EN 300 q73-ENGL 1997 3900855 0237627 57Li D EN 300 473 VI .I .2 (1997-08) European Standard (Telecommunications series) Digital Video Broadcasting (DVB); Satellite Master Antenna Television (SMATV) distribution systems COPYRIGHT European Telecommunications Standards InstituteLicensed by In
2、formation Handling Services_ STD-ETSI EN 300 473-ENGL A777 3q00855 02A7b2 400 D 2 EN 300 473 V1.1.2 (1997-08) Reference REN/JTC-OODVB-48 (4doOOidc.PDF) Keywords DVB, digital, video, broadcasting, MPEG, TV, SMATV ETSI Secretariat Postal address F-O6921 Sophia Antipolis Cedex - FRANCE Office address 6
3、50 Route des Lucioles - Sophia Antipolis Valbonne - FRANCE Siret No 348 623 562 00017 - NAF 742 C Association A but non lucratif enregistre A la Sous-Prfecture de Grasse (06) No 7803/88 Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 X.400 c= fr; a=atlas; p=etsi; s=secretariat Internet secretariat et
4、si.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 European Telecommunications Standards Institute 1997. O European Broadcasting Union 1997. All rights
5、 reserved. COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Services STD.ETS1 EN 300 473-ENGL 3997 3qO3855 O237629 347 3 EN 300 473 V1.1.2 (1997-08) Contents Intellectual Property Rights 4 Foreword 4 1 2 3 3.1 3.2 4 5 5.1 5.2 6 6.1 6.2 7 8 Scope 5 Symbols and
6、 abbreviations 6 SMATV distribution system concepts . 7 SMATV System A . 8 SMATV System B . 10 MPEG-2 transport layer . 11 Framing structure . 11 Normative references . 5 6 Symbols . Abbreviations . 6 Full implementation of SMATV System A . Simplified implementation of SMATV System A 8 8 SM ATV -IF
7、. 11 SMATV-S 11 Annex A (informative): A.l A.2 Annex B (informative): B.l B.2 Channel model of SMATV distribution systems 12 Channel model response 12 Definition of adaptive equalization requirements 12 SMATV System A - Simulation results . 15 SMATV System B - Simulation results . 16 Annex C (inform
8、ative): Bit rate consideration for SMATV distribution systems . 20 Annex D (Informative): Bibliography . 22 History 23 Examples of 64-QAM and QPSK performance with equalizers . 15 COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Services4 EN 300 473 Vi .1.2 (
9、1 997-08) 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 , and can be found in ETR 314: “intellectual Prope
10、m Rights (IPRs); Essential, or potentially Essential, iPRs notified to ETSI in respect of ETSI standards“, which is available free of charge from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/www.etsi.iY/ipr). Pursuant to the ETSI Interim IPR Policy, no investigati
11、on, 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 314 (or the updates on http:/www.etsi.fr/ipr) which are, or may be, or may become, essential to the present document. Foreword This second edition, previously a
12、s 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.“ to 3) add in the foreword the DVB acknowledgement. “Digita
13、l Video Broadcast (DVB); etc.“; This European Standard (Telecommunications series) has been produced by the Joint Technical Committee (JTC) of the European Broadcasting Union (EBU), Comit Europen de Normalisation ELECtrotechnique (CENELEC) and the European Telecommunications Standards institute (ETS
14、I). NOTE: The EBU/ETSI 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 also CENELEC, which is responsible for the standardization
15、 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. The EBU has active members in about 60 countries in the Eu
16、ropean broadcasting area; its headquarters is in Geneva *. * European Broadcasting Union Case Postale 67 CH-1218 GRAND SACONNEX (Geneva) Switzerland Tel: 41 22717 21 11 Fax: +4122 717 24 81 Digital Video Broadcasting (DVB) Project Founded in September 1993, the DVB Project is a market-led consortium
17、 of public and private sector organizations in the television industry. Its aim is to establish the framework for the introduction of MPEG-2 based digital television services. Now comprising over 200 organizations from more than 25 countries around the world, DVB fosters market- led systems, which m
18、eet 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: Date of latest announcement of ETS 300 473 (doa): 26 December 1994 31 August 1995 Date of latest publication of new National
19、Standard or endorsement of ETS 300 473 (dopte): 29 February 1996 29 February 1996 1 Date of withdrawal of any conflicting National Standard (dow): COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling ServicesSTD-ETSI EN 300 473-ENGL 1997 3400855 0237b31 TT5 5 EN
20、300 473 V1.1.2 (1997-08) 1 Scope The present document describes the transmission system proposal for digital multi-programme television suitable for distribution in Satellite Master Antenna Television (SMATV) systems. The present document is complementary to the EN 300 429 l and it is aligned with E
21、N 300 421 2. The System described in the present document is compatible with the modulation and channel coding systems used for digital multi-programme television by cable and satellite transmissions (see EN 300 429 i and EN 300 421 21, respective1 y). The System described in the present document is
22、 based on the MPEG-2 System Layer, see ISO/IEC DIS 13818-1 31, with the addition of appropriate Forward Error Correction (FEC) technique. The System described in the present document allows for further evolution as technology advances as described in document EN 300 429 I and is capable of starting
23、a reliable service as of now (see also annex D, bibliography). 2 Normative references References may be made to: a) specific versions of publications (identified by date of publication, edition number, version number, etc.), in which case, subsequent revisions to the referenced document do not apply
24、; or b) all versions up to and including the identified version (identified by “up to and including“ before the version identity); 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 s
25、pecific version, in which case the latest version applies. A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same number. Dl EN 300 429: “Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for cable systems“.
26、 Pl EN 300 421: “Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for 11/12 GHz satellite services“. i31 41 ISOIIEC DIS 13818-1 (1994): “Coding of moving pictures and associated audio“. Forney, G.D. EEE Trans. Cornrn. Tech., COM-19, pp. 772-781, (October 1971): “Bur
27、st-correcting codes for the classic bursty channel“. COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Services6 EN 300 473 Vi .i .2 (1 997-08) 3 3.1 Symbols and abbreviations Symbols For the purposes of the present document, the following symbols apply: oc ro
28、ll-off factor f0 channel centre frequency Rs RU RU1 T Ts symbol period symbol Rate corresponding to the bilateral Nyquist bandwidth of the modulated signal useful bit Rate after MPEG-2 transport multiplexer bit Rate after RS outer coder number of bytes which can be corrected in RS error protected pa
29、cket 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: BB BER BW C/N DTVC DVB ETS FEC FIR IF IRD LNB LSB MPEG MSB MUX PDH PRBS QAM QW QPSK RF RS SMATV SM ATV-DTM SMATV-IF SMATV-S TDL TDM TDT TV UHF VHF BaseBand Bit Error Ratio Bandwidth Signal-to-Noise ra
30、tio 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 Significant Bit Multiplex Plesio
31、chronous Digital Hierarchy Pseudo Random Binary Sequence Quadrature Amplitude Modulation Quasi Error Free Quaternary Phase Shift Keying Radio Frequency Reed-S olomon Satellite Master Antenna Television (as defined in clause 4) SMATV system based on Digital TransModulation SMATV system based on distr
32、ibution at IF SMATV system based on distribution at extended Super band Tapped Delay Line Time Division Multiplex Transparent Digital Transmodul ati on Television Ultra High Frequency Very High Frequency COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling Servic
33、esSTDmETSI EN 300 473-ENGL li997 W 3400855 0217b33 878 - 7 EN 300 473 V1.1.2 (1 997-08) 4 SMATV distribution system concepts A Satellite Master Antenna Television (SMATV) system is defined as a system which is intended for the distribution of television and sound signals to households located in one
34、 or more adjacent buildings. These signais are received by a satellite receiving antenna and may be combined with terrestrial TV signals. SMATV distribution systems are also known as community antenna installations or domestic TV cable networks. A SMATV system represents a means for sharing the same
35、 resources among several users for satellite and terrestrial reception. The SMATV System is designed to perform the adaptation of the satellite TV signals to the SMATV channel characteristic s. The primary consideration of the SMATV System is the transparency of the SMATV head-end to the digital TV
36、multiplex from a satellite reception without baseband interfacing, delivering that signal to the user home Integrated Receiver Decoder (IRD); thus permitting simple and cost effective head-end as required for the consumer profile of SMATV equipment. The present document considers two main SMATV Syst
37、em approaches for distribution of digital TV signals in SMATV installations, as follows: SMATV System A The System A approach consists of the transmodulation from satellite Quaternary Phase Shift Keying (QPSK) signals as defined in EN 300 421 2 to a Quadrature Amplitude Modulation (QAM) scheme (16-Q
38、AM, 32-QAM or 64-QAM) using either: a. 1) a.2) a full implementation of the System described in EN 300 429 11 (see subclause 5.1), or a simplified transmodulation process as described in subclause 5.2 of the present document. This process of transmodulation without baseband interfacing is also known
39、 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 using frequency conversion of the received satellite signal to a frequency band appropriate to the Characteristics of the distribution network.
40、 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 terrestrial specification is not the subject of the present document. COPYRIGHT European Telecommunications Standards InstituteLicensed by Infor
41、mation Handling Services5 STD-ETSI EN 300 Y73-ENGL 1777 3L1030855 UZL7b3Y 7OY D 8 EN 300 473 V1.1.2 (1997-08) 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 Sy
42、stem comprises the following elements: - Head-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 ph
43、ysical cable structure for distribution of 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. -
44、 - 5.1 Full implementation of SMATV System A A full implementation of the QAM System shall be performed according to EN 300 429 i 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 frami
45、ng structure, the channel coding, the byte-to-symbol mapping and modulation consistent with EN 300 429 i and EN 300 421 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 configuratio
46、n is shown in figure 2. 5.2 Simplified implementation of SMATV System A in the complete implementation architecture of SMATV System A, outer error protection (Le. RS and convolutional interleaving) is performed twice, i.e. independently for the satellite link and the cable link. Therefore, the cable
47、 link is fed by a Quasi Error Free (QEF) bit 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 gen
48、erated 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 equipment co
49、st. Due to consumer type character of SMATV head-ends, this saving is important when an economy of scale is achieved. Consequently, manufacturers could decide whether to adopt the simplified SMATV System A architecture. COPYRIGHT European Telecommunications Standards InstituteLicensed by Information Handling ServicesSTD.ETS1 EN 300 473-ENGL 1997 m 3400855 02L7b35 b40 m 9 EN 300 473 V1.1.2 (1997-08) QAM SMAN user IRD SMAN UHF DISTRIBUTION NETWORK Figure 1: SMATV System A configuration Channel Interac demod. l I - dalchei filter
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