ETSI EN 300 421 V1.1.2 (1997-08)

Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for 11/12 GHz satellite services

REN/JTC-DVB-41

Digitalna videoradiodifuzija (DVB) – Struktura okvirov, kodiranje kanalov in modulacija za satelitske storitve na 11/12 GHz

General Information

• Status: Published
• Publication Date: 12-Aug-1997
• Technical Committee: BROADCAS - EBU/CENELEC/ETSI on Broadcasting
• Current Stage: 12 - Completion
• Due Date: 28-Aug-1997
• Completion Date: 13-Aug-1997
• Mandate: T-353
• Ref Project: SIST EN 300 421 V1.1.2:2003 - Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for 11/12 GHz satellite services

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digitalna videoradiodifuzija (DVB) – Struktura okvirov, kodiranje kanalov in modulacija za satelitske storitve na 11/12 GHzDigital Video Broadcasting (DVB); Framing structure, channel coding and modulation for 11/12 GHz satellite services33.170Televizijska in radijska difuzijaTelevision and radio broadcasting33.060.30Radiorelejni in fiksni satelitski komunikacijski sistemiRadio relay and fixed satellite communications systemsICS:Ta slovenski standard je istoveten z:EN 300 421 Version 1.1.2SIST EN 300 421 V1.1.2:2003en01-december-2003SIST EN 300 421 V1.1.2:2003SLOVENSKI
STANDARD



SIST EN 300 421 V1.1.2:2003



European Telecommunications Standards Institute EN 300 421 V1.1.2 (1997-08)European Standard (Telecommunications series)Digital Video Broadcasting (DVB);Framing structure, channel coding and modulationfor 11/12 GHz satellite servicesEBUUEREuropean Broadcasting UnionUnion Européenne de Radio-TélévisionSIST EN 300 421 V1.1.2:2003



EN 300 421 V1.1.2 (1997-08)2ReferenceREN/JTC-00DVB-41 (3wc00idc.PDF)KeywordsDVB, digital, video, broadcasting, satellite,MPEG, TVETSI SecretariatPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: [phone]
Fax: [phone]Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/88X.400c= fr; a=atlas; p=etsi; s=[e-mail]://www.etsi.frCopyright NotificationNo part may be reproduced except as authorized by written permission.The copyright and the foregoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1997.© European Broadcasting Union 1997.All rights reserved.SIST EN 300 421 V1.1.2:2003



EN 300 421 V1.1.2 (1997-08)3ContentsIntellectual Property Rights.4Foreword.51Scope.62Normative references.63Symbols and abbreviations.73.1Symbols.73.2Abbreviations.74Transmission system.84.1System definition.84.2Adaptation to satellite transponder characteristics.94.3Interfacing.94.4Channel coding.94.4.1Transport multiplex adaptation and randomization for energy dispersal.94.4.2Outer coding (RS), interleaving and framing.104.4.3Inner coding (convolutional).124.5Baseband shaping and modulation.135Error performance requirements.14Annex A (normative):Signal spectrum at the modulator output.15Annex B (informative):Conceptual System description.17Annex C (informative):Examples of bit rates versus transponder bandwidth.19Annex D (informative):Examples of possible use of the System.22Annex E (informative):Bibliography.23History.24SIST EN 300 421 V1.1.2:2003



EN 300 421 V1.1.2 (1997-08)4Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin ETR 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect ofETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the ETSIWeb server (http://www.etsi.fr/ipr).Pursuant to the ETSI Interim IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. Noguarantee can be given as to the existence of other IPRs not referenced in ETR 314 (or the updates onhttp://www.etsi.fr/ipr) which are, or may be, or may become, essential to the present document.SIST EN 300 421 V1.1.2:2003



EN 300 421 V1.1.2 (1997-08)5ForewordThis 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." to "DigitalVideo 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 theEuropean Broadcasting Union (EBU), Comité Européen de Normalisation ELECtrotechnique (CENELEC) and theEuropean Telecommunications Standards Institute (ETSI).NOTE:The EBU/ETSI JTC was established in 1990 to co-ordinate the drafting of standards in the specific fieldof broadcasting and related fields. Since 1995 the JTC became a tripartite body by including in theMemorandum of Understanding also CENELEC, which is responsible for the standardization of radio andtelevision receivers. The EBU is a professional association of broadcasting organizations whose workincludes the co-ordination of its members' activities in the technical, legal, programme-making andprogramme-exchange domains. The EBU has active members in about 60 countries in the Europeanbroadcasting area; its headquarters is in Geneva *.*European Broadcasting UnionCase Postale 67CH-1218 GRAND SACONNEX (Geneva)SwitzerlandTel:[phone]Fax:[phone]Digital Video Broadcasting (DVB) ProjectFounded in September 1993, the DVB Project is a market-led consortium of public and private sector organizations inthe television industry. Its aim is to establish the framework for the introduction of MPEG-2 based digital televisionservices. Now comprising over 200 organizations from more than 25 countries around the world, DVB fostersmarket-led systems, which meet the real needs, and economic circumstances, of the consumer electronics and thebroadcast industry.Proposed national transposition datesDate of adoption:15 August 1994Date of latest announcement of this EN (doa):30 November 1997Date of latest publication of new National Standardor endorsement of this EN (dop/e):31 May 1998Date of withdrawal of any conflicting National Standard (dow):31 May 1998SIST EN 300 421 V1.1.2:2003



EN 300 421 V1.1.2 (1997-08)61ScopeThe present document describes the modulation and channel coding system (denoted the "System" for the purposes ofthe present document) for satellite digital multi-programme Television (TV)/High Definition Television (HDTV)services to be used for primary and secondary distribution in Fixed Satellite Service (FSS) and Broadcast SatelliteService (BSS) bands. The System is intended to provide Direct-To-Home (DTH) services for consumer IntegratedReceiver Decoder (IRD), as well as collective antenna systems (Satellite Master Antenna Television (SMATV)) andcable television head-end stations, with a likelihood of remodulation, see EN 300 429 (bibliography).The System uses Quaternary Phase Shift Keying (QPSK) modulation and concatenated error protection strategy basedon a convolutional code and a shortened Reed-Solomon (RS) code.The System is suitable for use on different satellite transponder bandwidths.Compatibility with Moving Pictures Experts Group-2 (MPEG-2) coded TV services (see ISO/IEC DIS 13818-1 [1]),with a transmission structure synchronous with the packet multiplex, is provided. Exploitation of the multiplex flexibilityallows the use of the transmission capacity for a variety of TV service configurations, including sound and data services.All service components 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 developedby different manufacturers. This is achieved by describing in detail the signal processing principles at themodulator 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;-identifies the global performance requirements and features of the System, in order to meet the service qualitytargets.2Normative referencesReferences may be made to:a)specific versions of publications (identified by date of publication, edition number, version number, etc.), inwhich case, subsequent revisions to the referenced document do not apply; orb)all versions up to and including the identified version (identified by "up to and including" before the versionidentity); orc)all versions subsequent to and including the identified version (identified by "onwards" following the versionidentity); ord)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 later versions published as an EN with the samenumber.[1]ISO/IEC DIS 13818-1 (June 1994): "Coding of moving pictures and associated audio".[2]Forney, G.D. IEEE Trans. Comm. Tech., COM-19, pp. 772-781, (October 1971): "Burst-correcting codes for the classic bursty channel".[3]Intelsat Earth Station Standards (IESS) No. 308, revision 6 (26 October 1990): "Performancecharacteristics for Immediate Data Rate (IDR) digital carriers".SIST EN 300 421 V1.1.2:2003



EN 300 421 V1.1.2 (1997-08)73Symbols and abbreviations3.1SymbolsFor the purposes of the present document, the following symbols apply:aRoll-off factorC/NSignal-to-noise ratiodfreeConvolutional code free distanceEb/N0Ratio between the energy per useful bit and twice the noise power spectral densityfNNyquist frequencyG1,G2Convolutional code generatorsg(x)RS code generator polynomialIInterleaving depth [bytes]I, QIn-phase, Quadrature phase components of the modulated signaljBranch index of the interleaverKConvolutional code constraint lengthMConvolutional interleaver branch depth for j = 1, M = N/INError protected frame length (bytes)p(x)RS field generator polynomialrmIn-band ripple (dB)RsSymbol rate corresponding to the bilateral Nyquist bandwidth of the modulated signalRuUseful bit rate after MPEG-2 [1] transport multiplexerRu'Bit rate after RS outer coderTNumber of bytes which can be corrected in RS error protected packetTsSymbol periodX,YDi-bit stream after rate 1/2 convolutional coding3.2AbbreviationsFor the purposes of the present document, the following abbreviations apply:AWGNAdditive White Gaussian NoiseBBBaseBandBERBit Error RatioBSSBroadcast Satellite ServiceBWBandWidthDTHDirect To HomeFDMFrequency Division MultiplexFECForward Error CorrectionFIFOFirst-In, First-Out shift registerFIRFinite Impulse ResponseFSSFixed Satellite ServiceHEXHexadecimal notationHDTVHigh Definition TelevisionIFIntermediate FrequencyIMUXInput Multiplexer - FilterIRDIntegrated Receiver DecoderMPEGMoving Pictures Experts GroupMSBMost Significant BitMUXMultiplexOBOOutput Back OffOCTOctal notationOMUXOutput Multiplexer - FilterPPuncturingPDHPlesiochronous Digital HierarchyPSKPhase Shift KeyingPRBSPseudo Random Binary SequenceSIST EN 300 421 V1.1.2:2003



EN 300 421 V1.1.2 (1997-08)8QEFQuasi-Error-FreeQPSKQuaternary PSKRRandomized sequenceRFRadio FrequencyRSReed-SolomonSMATVSatellite Master Antenna TelevisionTBDTo Be DefinedTDMTime Division MultiplexTVTelevisionTWTATravelling Wave Tube Amplifier4Transmission system4.1System definitionThe System is defined as the functional block of equipment performing the adaptation of the baseband TV signals, fromthe output of the MPEG-2 transport multiplexer (see ISO/IEC DIS 13818-1 [1]), 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 dispersal;-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, therefore, ruggedness against noise andinterference, shall be the main design objective, rather than spectrum efficiency. To achieve a very high powerefficiency without excessively penalizing the spectrum efficiency, the System shall use QPSK modulation and theconcatenation of convolutional and RS codes. The convolutional code is able to be configured flexibly, allowing theoptimization 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 beused for multi-carrier Frequency Division Multiplex (FDM) type applications.Figure 1: Functional block diagram of the SystemSIST EN 300 421 V1.1.2:2003



EN 300 421 V1.1.2 (1997-08)9The System is directly compatible with MPEG-2 coded TV signals (see ISO/IEC DIS 13818-1 [1]). The modemtransmission 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 theSystem is designed to provide a "Quasi Error Free" (QEF) quality target. The QEF means less than one uncorrectederror-event per transmission hour, corresponding to Bit Error Ratio (BER) = 10-10 to 10-11 at the input of the MPEG-2demultiplexer.4.2Adaptation to satellite transponder characteristicsTransmissions of digital multi-programme TV services will use satellites in both the FSS and the BSS bands. The choiceof transponder bandwidth is a function of the satellite used and the data rates required by the service.The symbol rate shall be matched to given transponder characteristics. Examples based on computer simulations for ahypothetical satellite chain, not including interference effects, are given in annex C.4.3InterfacingThe System, as defined in the present document, shall be delimited by the following interfaces given in table 1:Table 1: System interfacesLocationInterfaceInterface typeConnectionTransmit stationInputMPEG-2 [1] transportmultiplexfrom MPEG-2multiplexerOutput70/140 MHz IFto RF devicesReceive installationOutputMPEG-2 transportmultiplexto MPEG-2demultiplexerInputTBDfrom RF devices(indoor unit)4.4Channel coding4.4.1Transport multiplex adaptation and randomization for energy dispersalThe System input stream shall be organized in fixed length packets (see figure 3), following the MPEG-2 transportmultiplexer (see ISO/IEC DIS 13818-1 [1]). The total packet length of the MPEG-2 transport Multiplex (MUX) packetis 188 bytes. This includes 1 sync-word byte (i.e. 47HEX). The processing order at the transmitting side shall always startfrom the MSB (i.e. "0") of the sync word-byte (i.e. 01000111).In order to comply with ITU Radio Regulations and to ensure adequate binary transitions, the data of the input MPEG-2multiplex shall be randomized in accordance with the configuration depicted in figure 2.The polynomial for the Pseudo Random Binary Sequence (PRBS) generator shall be:1 + X14 + X15Loading of the sequence "100101010000000" into the PRBS registers, as indicated in figure 2, shall be initiated at thestart of every eight transport packets. To provide an initialization signal for the descrambler, the MPEG-2 sync byte ofthe first transport packet in a group of eight packets is bit-wise inverted from 47HEX to B8HEX. This process is referredto as the "Transport Multiplex
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