Minimum-shift keyed modem implementations for high data rates英文学习资料

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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