电子信息工程 本科论文英文文献翻译.docx
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电子信息工程 本科论文英文文献翻译.docx
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电子信息工程本科论文英文文献翻译
外文资料翻译
学院:
电子工程学院
系(专业):
电子信息工程
班级:
电子061
姓名:
学号:
指导教师评语:
签名:
年月日
一:
外文原文
3GTECHNOLOGY
Althoughthetechnologybehind3Gmayseemcomplicated,thewaysinwhich3Gwillaffectallofourlivesareeasytoimagine.Justimaginehavingacombinedcamera,videocamera,computer,stereo,andradioincludedinyourmobilephone.Rich-mediainformationandentertainmentwillbeatyourfingertipswheneveryouwantanywherethereisawirelessnetwork。
Mobilecommunicationismovingfromsimplevoicetorichmedia,whereweusemoreofoursensestointensifyourexperiences.
Butnotallofthiswillhappenatonce.3Gisanevolutiontoacommunicationsidealthatnoonecompletelyunderstandsyet.WhatwedoknowisthatmobilemultimediawillhittheJapanesemarketsin2001,andEuropeandNorthAmericawillfollowsoonafter。
3Gbringstogetherhigh-speedradioaccessandIP-basedservicesintoone,powerfulenvironment.ThesteptowardsIPisvital.IPispacket-based,whichinsimpleterms,meansuserscanbe”online”atalltimes,butwithouthavingtopayuntilweactuallysendorreceivedata.TheconnectionlessnatureofIPalsomakesaccessalotfaster:
filedownloadscantakeafewsecondsandwecanbeconnectedtoourcorporatenetworkwithasingleclick.
3Gintroduceswidebandradiocommunications,withaccessspeedsofupto2Mbit/s.Comparedwithtoday'smobilenetworks,3Gwillsignificantlyboostnetworkcapacity—sooperatorswillbeabletosupportmoreusers,aswellasoffermoresophisticatedservices.
3G-Athome
3Gisgoingtoaffectourhomeandsociallivesinmanyways.Theservicesthat3Genableswillhelpustomanageourpersonalinformation,simplifytaskssuchasgroceryshopping,makebetteruseofourtimeandofferservicesthatarejustfuntouse。
Operatorswillbeabletodevelopmyriadnewserviceopportunitiestoattractandretainnewcustomers。
Herearesomeexamples:
∙You'resittingonatrainandusethis"dead”timetologontoyourbankaccount,checkyourbalanceandpayafewbills-allthroughyour3Gdevice.Yousavetimeandcanbesmarteraboutmanagingyourfinances。
∙Onatouringvacation,youarriveinanewcity。
Youhaven'tmadeanyreservationsinadvance,becauseyoucandothiswhenyougetthere,byusingyour3Ghandsettoobtainup—to-dateinformation,includinghotelvacancies。
Havingbookedaroom,youcanuseyourmobiletoviewvideoclipsoflocaltouristattractionsandtalktosomeonefromthelocaltouristinformationbureauatthesametime。
3G-Atwork
3Gwillnotjustsupporttheneedsofbusinesspeoplewhotravelalot,butwillalsohelpnew,flexibleworkingpractices,suchashome—workingandremoteaccesstocorporatenetworksoutsidetraditionalworkinghours.Businesspeopleareoftenhigh-volumeairtimeusers,sotheyrepresentabigopportunityformobileoperators。
Herearesomeexamples:
∙Atworkyoureceiveamessagefromyour”smart"refrigeratorathome。
Themessagetellsyouthatcertainitemsneedrestockingandanorderhasalreadybeenpreparedforthelocalgrocerystore,whichyoucanapprove,sothatyourgroceriesarereadytocollectonthewayhome.
∙Youareontheroad,andurgentlyneedtodiscussadraftpresentationwithanumberofcolleaguesbackintheoffice.Pullingintoaservicestation,youuseyour3Gdevicetoholdatelemeetingwithyourcolleaguesand,atthesametime,youcanallviewthedraftpresentationandmakechangesonline.
∙Amaintenanceengineerisrepairingsomeequipmentonaclient’spremisesandhitsaproblem.Usinghis3Gdevice,hecontactshisdepartmentanddownloadsademonstrationvideothatguideshimthroughtherepairprocess.
TECHNOLOGY
3Gbringstogethertwopowerfulforces:
widebandradiocommunicationsandIP-basedservices.Together,theselaythegroundworkforadvancedMobileInternetservices,includingpersonalizedportals,”infotainment",mobilecommerceandunifiedmessaging-encompassinghigh—speeddata,superiorqualityvoiceandvideoandlocation-basedservices.
Making3Garealitydependsontechnologydevelopmentsindifferentareas。
Theseincludeamendmentstotheradiointerfacetosupportwidebandcommunicationsandinthecorenetwork.Supportingtechnologies,suchasWAPandBluetooth,alsohaveanimportantroletoplay。
Thissectionprovidesabriefoverviewofsomeofthemaintechnologiesanddevelopmentsinvolved。
Ericssonsupportsallofthesetechnologiesandhasplayedanactiveroleintheirdevelopment.
GPRS
GeneralPacketRadioService(GPRS)isanenhancementtoexistingGSMandTDMAnetworksthatintroducespacketdatatransmission,enabling”alwayson”mobility.Thismeansthatuserscanchoosetobepermanentlyloggedontoe-mail,Internetaccessandotherservices,butdonothavetopayfortheseservicesunlesssendingorreceivinginformation.WhenEDGEisaddedtoGPRS,thesedatarateswillincreaseupto384kbit/s。
GPRSwillbeimplementedbyaddingnewpacketdatanodesandupgradingexistingnodestoprovidearoutingpathforpacketdatabetweenthemobileterminalandagatewaynode.ThegatewaynodewillprovideinterworkingwithexternalpacketdatanetworksforaccesstotheInternetandintranets.
Benefits:
∙Fasterdataspeedsand"alwayson”mobility
∙Almostinstantaneousconnectionset—up
∙Connectiontoanabundanceofdatasourcesaroundtheworld,throughsupportformultipleprotocols,includingIP
∙Asteptowardsfull3Gservices。
WCDMA
WidebandCodeDivisionMultipleAccess(WCDMA)isawidebandradiotechniquethatprovidesfarhigherdataratesthanotherradiotechniquesavailabletoday,upto2Mbit/s,andhighlyefficientuseofradiospectrum.
ThehigherbandwidththatWCDMAprovideswilldeliverthefullpotentialof3G.Forexample,WCDMAallowssimultaneousaccesstoseveralvoice,videoanddataservicesatonce.
WCDMAisfullycompliantwithIMT-2000andistheairinterfacetechnologyforstandardsinthe2GHzbandwidth(theIMT-2000coreband),knownasUMTS(UniversalMobileTelecommunicationSystem)inEuropeandARIB(AssociationofRadioIndustryBusinesses)inJapan.
EricssonhasbeenattheforefrontofWCDMAdevelopment.ThecompanydeliveredanexperimentalWCDMAsystemtoNTTDoCoMoinJapanbackin1998.EricssonhasalsosetupWCDMAtestsystemsaroundtheworld.At2000,EricssonannounceditsfirstfamilyofWCDMAbasestations.
EDGE
EnhancedDataRatesforGlobalEvolution(EDGE)enablesGSMandTDMAoperatorstooffer3Gservicesusingexistingnetworkfrequencies.Bymakingchangesandadditionstostandardizationofevolutionaryphasesoftheairinterfaceandthebackbonenetworks,aswellasthemigrationtoALL—IPandmultimedianetworks.
cdma2000
cdma2000isadecidedlyefficient3Gstandardforthedeliveryofhighbandwidthdataandhighcapacityvoiceservices。
Theevolutionofthecdma2000standardwillenablemobilesystemstoofferdatathroughputsof2Mbit/secandbeyond。
Thehigherbandwidththatcdma2000provideswilldeliverthefullpotentialof3G.Forexample,cdma2000alsoallowssimultaneousaccesstoseveralvoice,videoanddataservicesatonce。
cdma2000isfullycompliantwithIMT—2000requirementsfor3G.cdma2000willbeimplementedintheexistingfrequencybandsofCMDAandTDMAat800and1900MHz,aswellasinnewspectrumat2GHzinJapan.
Ericssonisaleaderincdma2000development,andakeydriverinthestandardizationofevolutionaryphasesoftheairinterfaceandthebackbonenetworks,aswellasthemigrationtoALL—IPandmultimedianetworks.
Bluetooth
Bluetoothisanopenstandardfortwo—way,short-waveradiocommunicationsbetweendifferentdevices。
Itmarkstheendofcablesandcordsbetweenmobilephones,palmtops,portablePCsandprinters,forexample.Furthermore,Bluetoothenablesinformationbetweensuchdevicestobesynchronized.DiaryinformationheldonaPDAcanbeupdatedautomaticallywhenwithinrangeofaBluetooth—enabledPC。
Bluetoothisalsogoingtobeimportantformachine-to—machinecommunications—oneofthelargestgrowthareasintelecommunications。
Bluetoothisakeydevelopmentforterminalsandotherdevicesusingmobilenetworks。
Itisavailablenowfor2Gnetworksandas3Gsystems,willplayanincreasinglyimportantsupportingroleinthefutureofmobilecommunications。
EricssonhasalreadyannouncedBluetoothdevices,includingtheT36BluetoothphoneandaBluetoothheadset.
BluetoothwasoriginallydevelopedbyEricsson,butisnowundertheauspicesoftheBluetoothSpecialInterestGroup。
Ithaswidespreadsupportamongtelecomequipmentvendors,computerandchipmanufacturers.
Symbian
SymbianisanindependentjointventuresupportedbycompaniesincludingEricsson,Nokia,MotorolaandPsion。
Symbianaimstopromoteamassmarketformobileinformationdevicesintwoways:
∙First,throughthedevelopmentofcoresoftware,applicationframeworks,applicationsanddevelopmenttoolsformobilemultimediadevices(suchasPDAs,smartphonesandcommunicators)
∙Second,by”evangelizing”standardsfortheinteroperationofmobileinformationdevices.Symbian'sEPOCoperatingsystemisalreadyavailableandEricssondevicessuchastheR380areEPOC—enabled.
WAP
WirelessApplicationProtocol(WAP)isaglobal,openstandardthatgivesmobileusersaccesstoInternetservicesthroughhandhelddevices。
ItenablesuserstoeasilyaccessawholerangeofMobileInternetandotherdataservicesfrommobiledevicessuchassmartphonesandcommunicators,andwithouttheneedtoplugintoaseparatelaptopordata—enableddevice.
WAPenablesthisthroughabuilt—in”WAPmicrobrowser”thatletsinformationbeaccesseddirectfromaphone,inthesam
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