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ID:38818624
大小:1.99 MB
页数:10页
时间:2019-06-19
《Minimum-shift keyed modem implementations for high data rates英文学习资料》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、IEEECOMMUNICATIONSMAGAZINEMinimum-ShiftKeyedModemImplementationsforHighDataRatesRODGERE.ZIEMERANDCARLR.RYANAnexaminationofmethodsfortheimplementationofmodulatorsanddemodulatorssuitableforhigh-data-rateapplications.IGITALcommunicationslinkscapableofconvey-simulationscomparingthe
2、performancesofthesethreeingdataathundredsofmegabitspersecond(Mb/s)modulationschemesinbandlimitedand/ornonlinearchan-arebecomingincreasinglyimportantinvariousnels.Generally,thechoicebetweenQPSK,OQPSk,andapplications.AnexampleistheuseoftimedivisionmultipleMSKisnotclearcutinenviro
3、nmentstypicalofsatelliteoraccess(TDMA)transmissionthroughasatelliterelayline-of-sightcommunicationslinks.Eachhasitsmeritswhenwhereinseveraldatachannelsareroutedthroughsinglesystemparametersareoptimizedfortheenvironmentofuplinkanddownlinkpaths(antennabeams).Separationofinterest.
4、Thechoiceofaparticularmodulationtechniqueinathechannelsfromeachotherisaccomplishedthroughgivenapplicationwillquiteofteninvolveconsiderationsotherinterleavinganddeinterleavingintime,withpossiblereroutingthancommunicationsorbandwidthefficiency,Zsuchaseasetakingplaceinthesatellite
5、.Whencarryingtrafficfromlargeofimplementation.Theobjectiveofthispaperistoexaminemetropolitanareas,therequireddataratescanexceed100methodsfortheimplementationofmodulatorsanddemodu-Mb/s.Onesuchimplementation,currentlyunderstudybyNASA,'involvesdatatransmissionatratesofupto550..Mb/
6、s.Suchapplicationsrequiretheuseofmodulationschemesthatusetheavailablebandwidthefficiently.Furthermore,becausepowerisatapremiumonboardasatellite,theutmostinpowerefficiencyisdesiredofthechosenmodulationscheme.Thisimpliestheuseofaconstant-envelopemodulationschemesinceamplifiers,su
7、chastravelingwave-tubeamplifiers,aremostefficientwhenoperatednearsaturation.Threepopularconstant-envelopemodulationschemesforefficienttransmissionofdigitaldataarequadriphase-shiftkeying(QPSK),offset(orstaggered)quadriphase-shiftkeying(OQPSK),andminimum-shiftkeying(MSK).Twoexcel
8、lentrecentarticles[1,2]inIEEECommunicationsMagazinehav
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