通信工程 毕业设计外文文献翻译:超宽带系统的数据通信资料Word文档格式.docx
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通信工程 毕业设计外文文献翻译:超宽带系统的数据通信资料Word文档格式.docx
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英文资料
Ultra-WidebandSystemsforDataCommunications
G.Racherla,J.L.Ellis,D.S.Furuno,S.C.LinGeneralAtomics,AdvancedWirelessGroup
10240FlandersCt.SanDiegoCA92121
E-mail:
gopal.racherla,jason.ellis,susan.lin,david.furuno@gatWebsite:
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.
ABSTRACT
Ultra-WidebandtUWBisaradiotransmissionschemethatusesextremelylowpowerpulsesofradioenergyspreadacrossawidespectrumoffrequencies.UWBhasseveraladvantagesoverconventionalcontinuouswaveradiocommunicationsincludingpotentialsupportforhighdatarates,robustnesstomultipathinterferenceandfading.WepresentanoverviewofUWBtechnologyanditsuseindatacommunicationsandnetworking.WelookatdesignconsiderationsforUWBbasednetworksatvariouslayersoftheprotocolstack.
INTRODUCTION Ultra-Wideband[1-6]一alsoknownasbasebandor
impulseradio一isacarrier-freeradiotransmissionthatusesnarrow,extremelylowpowerpulsesofradioenergyspreadacrossawidespectrumoffrequencies.UWBhasrecentlygainedagreatdealof
interestduetotherecentFederalCommunicationsCommissionFCCReportandOrderwhichallocatestheUWBband一7.5GHzofunlicensed
spectrumforindoorandoutdoorcommunicationapplications.UWBcommunicationsarerequiredtohavea-10dBfractionalbandwidthofmorethan20%ora-10dBbandwidthofmorethan500MHz[7].ItisimportanttonotethattheFCChasnotdefinedaspecificmodulationschemetobeused.UWBsystemsofferthepromiseofhighdatarate,lowsusceptibility
tomultipathfading,hightransmissionsecuritylowprimepowerrequirements,lowcost,andsimpledesign[1,2,5,6].UWBhasbeenusedinmilitaryapplicationsforthepastseveralyearsforground-penetratingprecisionradarapplicationsandsecurecommunications[3,8].Forthepastfewyears,UWBhasbeendevelopedforcommercialapplications[1,2,5,6].WiththerecentFCC[7]reportandorderfortheuseofUWBtechnology,therehasbeenanaddedimpetustothisendeavor.OthernotableUWBapplicationsincludecollisionavoidanceradar,tagging/identification;
geolocation[9]anddatacommunicationsinpersonalareanetworksPANandlocalareanetworkLANenvironmentsUWBpresentsagreatopportunityfordata
communicationsfortoday'
smedia-richconsumerelectronicsandhomeentertainmentsystemsthatrunonbatterypoweredhandhelddevices.Itcanformthebasisofalowcost,lowpowerandveryhighdataratesolutionasawireless"
cablereplacement"
technologyforcomputer-to-peripherals,peripherals-to-peripheralsanddigitalhomenetworkingapplications.AveryusefulattributeofUWBtechnologyisitsabilitytoperformprecisiongeo-locationwhichcanaidinad-hocormeshnetworkingwheretheoperationsofthemobilehostsbenefitbyknowingthelocationoftheotherhosts.UWBtechnologypromisestofillthevoidleftbyestablishedstandardslikeBluetoothand802.11a/b/gThereareseveralfuturechallengestothewideadoptionofUWBforwirelessdatacommunicationsincludingtheinfancyofthetechnologyinthecommercialarena,lackofreliable
channelmodels,theearlystagesofstandardizationeffortandlackoflow-costsystemonchipSoCimplementations.Inthispaper,welookatUWBtechnologyfordatacommunicationsandinsideaUWBphysicalPHYlayercharacteristics.Wealsobrieflyintroduceotherrelatedwirelessstandardssuchas802.11[10],802.15.3[11-13]Bluetooth[14],HomeRF[15]andHIPERLAN[16]andpresentabriefsynopsisoftheregulatoryeffortworldwidewithspecialemphasisontheFCC.WealsopresentthedesignconsiderationsforUWBbaseddatanetworking.
ULTRA-WIDEBANDTECHNOLOGY
ThebasicwaveformthatemployedinaUWBsystemisanapproximationtoanimpulse,suchasthatshowninFig.1.Theshortdurationofthepulseisassociatedwithlargeinherentbandwidth;
hence,thenomenclature"
Ultra-Wideband"
.TypicalattributesofUWBwaveformsaresummarizedinTable1.
Fig.1.UWBwaveformexample.
ThehighspectralcontentoftheUWBwaveformgivesrisetooneoftheprimaryadvantagesUWBoperationforcommunicationswhereaUWBsystemisrobustagainstmultipathfading[17]andnarrowband
interference[18].Inmultipathfading,wherethetransmittedradiofrequencyrtsignalcanreflectoffobjectsinitstransmissionpathandcancausedestructiveinterferencesatthereceiver,alossofreceptioncanoccur.This
Table1:
CharacteristicsofTypicalUWBSystemsFractionalBandwidth 20%
PulseWidth0.1-2as
PulseRepetitionFrequency1kHz-2GHzAverageTransmittedPower1mW
effectisparticularlyproblematicindoorswheretherearemanyreflectingsurfaces.Inthefrequencydomain,multipathisshownasfrequencyselectivefading.BecauseUWBcommunicationssystemsspreadsthetransmitteddataoverabroadfrequency
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