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 978-0-626-19426-0 SANS 300421:2007Edition 2ETSI EN 300421:1997Edition V1.1.2SOUTH AFRICAN NATIONAL STANDARD Digital Video Broadcasting (DVB); Framin
4、g structure, channel coding and modulation for 11/12 GHz satellite services This national standard is the identical implementation of ETSI EN 300421:1997 and is adopted with the permission of the European Telecommunications Standards Institute. Published by Standards South Africa 1 dr lategan road g
5、roenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 300421:2007 Edition 2 ETSI EN 300421:1997 Edition V1.1.2 Table of changes Change No. Date Scope National foreword This South African standard was appro
6、ved by National Committee StanSA 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 300421:1994). Europ
7、ean Standard (Telecommunications series) Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for 1 111 2 GHz satellite services European Broadcasting Unio Union Europeenne de Radio-Television European Telecommunications Standards Institute Reference RENIJTC-00DVB-41 (3
8、wcOOidc.PDF) Kevwords DVB, digital, video, broadcasting, satellite, MPEG, TV ETSl 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 0001 7 -
9、 NAF 742 C Association a but non lucratif enregistree a la Sous-Prefecture de Grasse (06) No 7803188 c= fr; a=atlas; p=etsi; %secretariat Internet secretariat etsi.fr http:/www.etsi.fr Covriuht Notification No part may be reproduced except as authorized by written permission. The copyright and the f
10、oregoing restriction extend to reproduction in all media. O European Telecommunications Standards Institute 1997. O European Broadcasting Union 1997. All rights reserved. Contents Intellectual Property hghts 4 Foreword 5 1 Scope 6 . 2 Normative references 6 3 Symbols and abbreviations 7 3.1 Symbols
11、. 7 3.2 Abbreviations . 7 Transmission system 8 System definition . 8 Adaptation to satellite transponder characteristics 9 Interfacing 9 Channel coding 9 Transport multiplex adaptation and randomization for energy dispersal 9 . Outer coding (RS) . interleaving and framing 10 Inner coding (convoluti
12、onal) 12 . Baseband shaping and modulation 13 5 Error performance requirements 14 . Annex A (normative): Signal spectrum at the modulator output 15 Annex B (informative): Conceptual System description 17 Annex C (informative): Examples of bit rates versus transponder bandwidth . 19 Annex D (informat
13、ive): Examples of possible use of the System . 22 . Annex E (informative): Bibliography 23 History 24 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 a
14、vailable for ETSI members and non-members. and can be found in ETR 3 14: “Iiltellectual Propem Rights (IPRs); Esseiztial, or poteiztiallx Esserzrial. IPRs ilot$ied to ETSI in respect of ETSI standards“. which is available free of charge from the ETSI Secretariat. Latest updates are available on the
15、ETSI Web server (http:/www.etsi.fr/ipr). 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:/www.etsi.fr/ipr) which are, or map
16、 be, or may become. essential to the present 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 tele
17、vision. sound and data services: etc.“ to “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). Comit6 EuropCen de No
18、rmalisation ELECtrotechnique (CENELEC) and 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 incl
19、uding in the Memorandum of Understanding 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. programm
20、e-making and programme-exchange domains. The EBU has active members in about 60 countries in the European broadcasting area: its headquarters is in Geneva “. * European Broadcasting Union Case Postale 67 CH-12 18 GRAND SACONNEX (Geneva) Switzerland Tel: 1-412371721 11 Fax: +41 227172481 Digital Vide
21、o Broadcasting (DVB) Project Founded in September 1993. the DVB Project is a market-led consortium 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 or
22、ganizations from more than 25 countries around 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: 15 August 1994 Date of latest announcement
23、of this EN (doa): 30 November 1997 Date of latest publication of new National Standard or endorsement of this EN (dople): 31 May 1998 Date of withdrawal of any conflicting National Standard (don,): 31 May 1998 Scope The present document describes the modulation and channel coding system (denoted the
24、 “System“ for the purposes of the present document) for satellite digital multi-programme Television (TV)/High Definition Television (HDTV) senrices to be used for primary and secondary distribution in Fixed Satellite Service (FSS) and Broadcast Satellite Senrice (BSS) bands. The System is intended
25、to provide Direct-To-Home (DTH) senices for consumer Integrated Receiver Decoder (IRD). as well as collectire antenna systems (Satellite Master Antenna Teleision (SMATV) and cable television head-end stations. with a likelihood of remodulation. see EN 300 429 (bibliography). The System uses Quaterna
26、ry Phase Shift Keying (QPSK) modulation and concatenated error protection strategy based on a convolutional code and a shortened Reed-Solomon (RS) code. The System is suitable for use on different satellite transponder bandvidths. Compatibility with Moving Pictures Experts Group- (MPEG-2) coded TV s
27、erices (see ISODEC DIS 1381 8-1 I). with a transmission structure synchronous with the packet multiplex. is provided. Exploitation of the multiplex flexibility allows the use of the transmission capacity for a variety of TV service configurations. including sound and data services. All service compo
28、nents are Time Division Multiplexed (TDM) on a single digital carrier. The present document: - gives a general description of the System for satellite digital TV transmission: - specifies the digitally modulated signal in order to allow compatibility between pieces of equipment developed by differen
29、t manufacturers. This is achieved by describing in detail the signal processing principles at the modulator side, while the processing at the receive side is left open to different implementation solutions. However. it is necessary in the present document to refer to certain aspects of reception: -
30、identifies the global performance requirements and features of the System. in order to meet the service quality targets. 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, su
31、bsequent 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): or C) all versions subsequent to and including the identified version (identified by “onwards“ following the ve
32、rsion identity): or d) publications without mention of a specific version. in ivhich 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. ISOEC DIS 1381 8- 1 (June 1994): “Coding of moving pictures
33、 and associated audio“. ?I Forney. G.D. IEEE Trans. Comm. Tech COM-19. pp. 772-781. (October 1971 ): “Burst- correcting codes for the classic bursty channel“. PI Intelsat Earth Station Standards (IESS) No. 308. revision 6 (36 October 1990): “Performance characteristics for Immediate Data Rate (IDR)
34、digital camers“. 3 Symbols and abbreviations 3.1 Symbols For the purposes of the present document. the following symbols apply: Roil-off factor Signal-to-noise ratio Convolutional code free distance Ratio between the energy per useful bit and twice the noise power spectral density Nyquist frequency
35、Convolutional code generators RS code generator polynomial Interleaving depth bytes In-phase. Quadrature phase components of the modulated signal Branch index of the interleaver Convolutional code constraint length Convolutional interleaver branch depth for j = 1. M = N/I Error protected frame lengt
36、h (bytes) RS field generator polynomial In-band ripple (dB) Symbol rate corresponding to the bilateral Nyquist bandwidth of the modulated signal Useful bit rate after MPEG-2 I transport multiplexer Bit rate after RS outer coder Number of bytes which can be corrected in RS error protected packet Symb
37、ol period Di-bit stream after rate 112 convolutional coding 3.2 Abbreviations For the purposes of the present document. the following abbreviations apply: AWGN BB BER BSS BW DTH FDM FEC FIFO FIR FSS HEX HDTV IF IMUX IRD MPEG MSB MUX OBO OCT OMUX P PDH PSK PRBS Additive White Gaussian Noise BaseBand
38、Bit Error Ratio Broadcast Satellite Service Bandwidth Direct To Home Frequency Division Multiplex Forward Error Correction First-In. First-Out shift register Finite Impulse Response Fixed Satellite Service Hexadecimal notation High Definition Television Intermediate Frequency Input Multiplexer - Fil
39、ter Integrated Receiver Decoder Moving Pictures Experts Group Most Significant Bit Multiplex Output Back Off Octal notation Output Multiplexer - Filter Puncturing Plesiochronous Digital Hierarchy Phase Shift Keying Pseudo Random Binary Sequence QEF QPSK R RF RS SMATV TBD TDM TV TWTA Quasi-Error-Free
40、 Quaternary PSK Randomized sequence Radio Frequency Reed-Solomon Satellite Master Antenna Television To Be Defined Time Division Multiplex Television Travelling Wave Tube Amplifier 4 Transmission system System definition The System is defined as the functional block of equipment performing the adapt
41、ation of the baseband TV signals. from the output of the MPEG-7 transport multiplexer (see ISO/IEC DIS 13818-1 I). to the satellite channel characteristics. The following processes shall be applied to the data stream (see figure 1): - transport multiplex adaptation and randomization for energy dispe
42、rsal: - outer coding (i.e. Reed-Solomon): - convolutional interleaving: - inner coding (i.e. punctured convolutional code): - baseband shaping for modulation; - modulation The System functional description is given in annex B DTH services via satellite are particularly affected by power limitations.
43、 therefore? ruggedness against noise and interference. shall be the main design objective. rather than spectrum efficiency. To achieve a very high power efficiency without excessively penalizing the spectrum efficiency, the System shall use QPSK modulation and the concatenation of convolutional and
44、RS codes. The convolutional code is able to be configured flexibly. allowing the optimization of the system performance for a given satellite transponder bandwidth (see annex C). Although the System is optimized for single carrier per transponder Time Division Multiplex (TDM). it is able to be used
45、for multi-camer Frequency Division Multiplex (FDM) type applications. Data coder I+ 2 Service components n Services MPEG-2 Source coding and multiplexing Convolutional code energy leaver dspersal to the RF Satellite Channel Satellite channel adapter Figure 1 : Functional block diagram of the System
46、The System is directly compatible with MPEG-2 coded TV signals (see ISO/IEC DIS 13818-1 I). The modem transmission frame is synchronous with the MPEG-2 multiplex transport packets. If the received signal is above C/N and C/I threshold. the Forward Error Correction (FEC) technique adopted in the Syst
47、em is designed to provide a “Quasi Error Free“ (QEF) quality target. The QEF means less than one uncorrected error-event per transmission hour. corresponding to Bit Error Ratio (BER) = 10-lo to 10-11 at the input of the MPEG-2 demultiplexer. 4.2 Adaptation to satellite transponder characteristics Tr
48、ansmissions of digital multi-programme TV services will use satellites in both the FSS and the BSS bands. The choice of transponder bandwidth is a function of the satellite used and the data rates required by the senlice. The symbol rate shall be matched to given transponder characteristics. Example
49、s based on computer simulations for a hypothetical satellite chain. not including interference effects. are given in annex C. 4.3 Interfacing The System. as defined in the present document, shall be delimited by the following interfaces given in table 1 : Table 1 : System interfaces 4.4 Channel coding 4.4.1 Transport multiplex adaptation and randomization for energy dispersal Connection from MPEG-2 multiplexer to RF devices to MPEG-2 demultiplexer from RF devices (indoor unit) The System input stream shall be organized in fixed length packets (see figure 3). follo
