a049w97.docx
- 文档编号:18125356
- 上传时间:2023-08-13
- 格式:DOCX
- 页数:41
- 大小:345.69KB
a049w97.docx
《a049w97.docx》由会员分享,可在线阅读,更多相关《a049w97.docx(41页珍藏版)》请在冰点文库上搜索。
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
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- a049w97