a049w97.docx

a049w97.docx

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a049w97

DigitalVideoBroadcasting（DVB）;

Framingstructure,channelcodingandmodulation

forDigitalSatelliteNewsGathering（DSNG）

andothercontributionapplicationsbysatellite

DVBDocumentA049

June1999

Reproductionofthedocumentinwholeorinpartwithoutpriorpermissionofthe

DVBProjectOfficeisforbidden.

DVBProjectOffice

7thJune1999

Contents

Rights2

1Scope3

2References4

3Symbolsandabbreviations5

3.1Symbols5

3.2Abbreviations5

4Transmissionsystem6

4.1Systemdefinition6

4.2Adaptationtosatellitetranspondercharacteristics7

4.3Interfacing7

4.4ChannelcodingforQPSKmodes7

4.4.1Transportmultiplexadaptationandrandomizationforenergydispersal8

4.4.2Outercoding（RS）,interleavingandframing8

4.4.3Innercoding（convolutional）8

4.5Bitmapping,basebandshapingandmodulationforQPSKmodes9

4.5.1BitmappingtoQPSKconstellation9

4.5.2Basebandshapingandquadraturemodulation10

4.6Channelcodingfortheoptional8PSKand16QAMmodes10

4.6.1Transportmultiplexadaptationandrandomizationforenergydispersal（8PSKand16QAMmodes）10

4.6.2Outercoding（RS）,interleavingandframing（8PSKand16QAMmodes）10

4.6.3Innercoding（"pragmatic"trelliscodingtype）（8PSKand16QAMmodes）10

4.7Bitmapping,basebandshapingandmodulationfortheoptional8PSKand16QAMmodes13

4.7.1Bitmappingtoconstellations（8PSKand16QAMmodes）13

4.7.1.1Innercodingandconstellationfor8PSK2/3（2CBPS）14

4.7.1.2Innercodingandconstellationfor8PSK5/6and8/9（1CBPS）15

4.7.1.3Innercodingandconstellationfor16QAM3/4and7/8（2CBPS）16

4.7.2Basebandshapingandmodulation（8PSKand16QAMmodes）18

5Errorperformancerequirements19

AnnexA（normative）:

Signalspectrumatthemodulatoroutput20

AnnexB（normative）:

Transmissionsetupsforinteroperabilitytestsandemergencysituations22

AnnexC（normative）:

Implementationofthe"optional"modes23

AnnexD（normative）:

SIimplementationforDSNGandothercontributionapplications24

AnnexE（informative）:

ExamplesofpossibleuseoftheSystem26

Bibliography29

History30

IntellectualPropertyRights

IPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinSR 000 314:

"IntellectualPropertyRights（IPRs）;Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefreeofchargefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver（http:

//www.etsi.org/ipr）.

PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinSR 000 314（ortheupdatesontheETSIWebserver）whichare,ormaybe,ormaybecome,essentialtothepresentdocument.

1Scope

Thepresentdocumentdescribesthemodulationandchannelcodingsystem（denotedthe"System"forthepurposesofthepresentdocument）forDigitalSatelliteNewsGathering（DSNG）andothercontributionapplicationsbysatellite.

AccordingtoITU-RRecommendationSNG.770-1[12],SNGisdefinedas"Temporaryandoccasionaltransmissionwithshortnoticeoftelevisionorsoundforbroadcastingpurposes,usinghighlyportableortransportableuplinkearthstations...".Theequipmentshouldbecapableofuplinkingthevideoprogramme（orprogrammes）withitsassociatedsoundorsoundprogrammesignals.Optionallyitshouldbecapableofprovidingtwo-wayco-ordination（communication）circuitsanddatatransmissionaccordingtoEN301222[6].Theequipmentshouldbecapableofbeingsetupandoperatedbyacrewofnomorethantwopeoplewithinareasonablyshorttime.Limitedreceivingcapabilityshouldbeavailableintheuplinkterminaltoassistinpointingtheantennaandtomonitorthetransmittedsignal,wherepossible.

Digitaltelevisioncontributionapplicationsbysatelliteconsistofpoint-to-pointorpoint-to-multipointtransmissions,connectingfixedortransportableuplinkandreceivingstations,notintendedtobereceivedbythegeneralpublic.

AlthoughtheseapplicationsoftentransmitasingleTVservice,theTransportStreammultiplexflexibilityalsoallowsmulti-programmeTVserviceswithassociatedsound,includingcommentarysoundchannelsanddataservices;inthiscasemultipleservicecomponentsareTimeDivisionMultiplexed（TDM）onasingledigitalcarrier.

MaximumcommonalitywithEN300421 [3]ismaintained,suchasTransportStreammultiplexing[1],scramblingforenergydispersal,concatenatederrorprotectionstrategybasedonReed-Solomoncoding,convolutionalinterleavingandinnerconvolutionalcoding.ThebaselineSystemcompatiblyincludes（asasubset）allthetransmissionformatsspecifiedbyEN300421[3],basedonQuaternaryPhaseShiftKeying（QPSK）modulationandissuitableforDSNGservicesaswellasforothercontributionapplicationsbysatellite.Nevertheless,otheroptional（annexCexplainsthemeaningof"optional"withinthepresentdocument）transmissionmodesareadded,usingEightPhaseShiftKeying（8PSK）modulationandSixteenQuadratureAmplitudeModulation（16QAM）,inordertofulfilspecificapplicationrequirements.Theseoptionalmodescanbeveryefficientincertaincontributionapplicationsbysatellite.

Thefollowingwarningsshouldbetakenintoaccountwhileusingthehighspectrumefficiencymodes,8PSKand16QAM:

theyrequirehighertransmittedEIRPsand/orreceivingantennadiameters,becauseoftheirintrinsicsensitivitytonoiseandinterferences;

theyaremoresensitivetolinearandnon-lineardistortions;inparticular16QAMcannotbeusedontranspondersdrivennearsaturation;

theyaremoresensitivetophasenoise,especiallyatlowsymbolrates;thereforehighqualityfrequencyconvertersshouldbeused（seeannexE）;

theSystemmodulation/codingschemesarenotrotationally-invariant,sothat"cycle-slips"and"phasesnaps"inthechaincanproduceserviceinterruptions;thereforefrequencyconversionsanddemodulationcarrierrecoverysystemsshouldbedesignedtoavoidcycle-slipsandphasesnaps.

TheSystemissuitableforuseondifferentsatellitetransponderbandwidths,eitherinsinglecarrierpertransponderorinmultiplecarrierspertransponder（FrequencyDivisionMultiplex,FDM）configuration.AnnexEgivesexamplesofpossibleuseoftheSystem.

Thepresentdocument:

-givesageneraldescriptionoftheSystem;

-specifiesthedigitallymodulatedsignalinordertoallowcompatibilitybetweenpiecesofequipmentdevelopedbydifferentmanufacturers.Thisisachievedbydescribingindetailthesignalprocessingprinciplesatthemodulatorside,whiletheprocessingatthereceivesideisleftopentodifferentimplementationsolutions.However,itisnecessaryinthepresentdocumenttorefertocertainaspectsofreception;

-identifiestheglobalperformancerequirementsandfeaturesoftheSystem,inordertomeettheservicequalitytargets.

2References

Thefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.

∙Referencesareeitherspecific（identifiedbydateofpublication,editionnumber,versionnumber,etc.）ornonspecific.

∙Foraspecificreference,subsequentrevisionsdonotapply.

∙Foranon-specificreference,subsequentrevisionsdoapply.

∙Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.

[1]ISO/IEC13818-1:

"Informationtechnology;Genericcodingofmovingpicturesandassociatedaudioinformation:

Systems".

[2]ISO/IEC13818-2:

"Informationtechnology;Genericcodingofmovingpicturesandassociatedaudioinformation:

Video".

[3]EN300421:

"DigitalVideoBroadcasting（DVB）;Framingstructure,channelcodingandmodulationfor11/12GHzsatelliteservices".

[4]EN50083-9:

"Cableddistributionsystemsfortelevision,soundandinteractivemultimediasignals;Part9:

InterfacesforCATV/SMATVheadendsandsimilarprofessionalequipmentforDVB/MPEG-2transportstreams".

[5]ETR154:

"DigitalVideoBroadcasting（DVB）;ImplementationguidelinesfortheuseofMPEG-2Systems,VideoandAudioinsatellite,cableandterrestrialbroadcastingapplications".

[6]EN301222:

"DigitalVideoBroadcasting（DVB）;Co-ordinationchannelsassociatedwithDigitalSatelliteNewsGathering（DSNG）".

[7]Void.

[8]EN300468:

"DigitalVideoBroadcasting（DVB）;SpecificationforServiceInformation（SI）inDVBsystems".

[9]ETS300327:

"SatelliteEarthStationsandSystems（SES）;SatelliteNewsGathering（SNG）TransportableEarthStations（TES）（13-14/11-12GHz）".

[10]ETS300673（1997）:

"RadioEquipmentandSystems（RES）;ElectroMagneticCompatibility（EMC）standardfor4/6GHzand11/12/14GHzVerySmallApertureTerminal（VSAT）equipmentand11/12/13/14GHzSatelliteNewsGathering（SNG）TransportableEarthStation（TES）equipment".

[11]TBR30:

"SatelliteEarthStationsandSystems（SES）;SatelliteNewsGathering（SNG）TransportableEarthStations（TES）operatinginthe11-12/13-14GHzfrequencybands".

[12]ITU-RRecommendationSNG.770-1:

"UniformoperationalproceduresforSatelliteNewsGathering（SNG）".

3Symbolsandabbreviations

3.1Symbols

Forthepurposesofthepresentdocument,thefollowingsymbolsapply:

αRoll-offfactor

C/NCarrier-to-noiseratio

dfreeConvolutionalcodefreedistance

Eb/N0Ratiobetweentheenergyperusefulbitandtwicethenoisepowerspectraldensity

fNNyquistfrequency

G1,G2Convolutionalcodegenerators

IInterleavingdepth[bytes]

I,QIn-phase,Quadraturephasecomponentsofth