交通信号灯控制电路的设计外文翻译

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1、附录4外文资料AdvantagesofCDMA2000CDMA2000benefitedfromtheextensiveexperienceacquiredthroughseveralyearsofoperationofcdmaOnesystems.Asaresult,CDMA2000isaveryefficientandrobusttechnology.Itdeliversthehighestvoicecapacityanddatathroughputusingtheleastamountofspectrum,anditcanbeusedtoprovides

2、ervicesinurbanaswellasremoteareascosteffectively.Theuniquefeatures,benefits,andperformanceofCDMA2000makeitanexcellenttechnologyforhigh-voicecapacityandhigh-speedpacketdata.SinceCDMA20001Xsupportsbothvoiceanddataservicesonthesamecarrier,itallowsoperatorstoprovidebothservicescosteffic

3、iently.CDMA20001xEV-DOisoptimizedfordataandiscapabletosupportlargevolumesofdatatrafficatbroadbandspeeds.1xEV-DOiswellsuitedtoprovidehigh-speeddataservicestoitsmobilesubscribersand/orbroadbandaccesstotheInternet.Duetoitsoptimizedradiotechnology,CDMA2000enablesoperatorstoinvestinfewer

4、cellsitesanddeploythemfaster,ultimatelyallowingtheserviceproviderstoincreasetheirrevenueswithfasterReturnOnInvestment(ROI).TheCDMA2000evolutionarypathwasdesignedtominimizeinvestmentandtheimpacttoanoperator’snetworkwithoutserviceinterruptionfortheend-user.Thishasbeenachievedthroughba

5、ckwardandforwardcompatibility,hardwarereuse,in-bandmigrationandhybridnetworkconfiguration.ThisuniquefeatureofCDMA2000technologieshasprovidedoperatorsasignificanttime-to-marketadvantageoverother3Gtechnologies.IncreasedVoiceCapacityThespectralefficiencyofCDMA20001Xpermitshightrafficde

6、ploymentsinasmallamount(1.25MHzchannel)ofspectrum.CDMA20001Xcanprovidevoice11capacityofnearlythreetimesthatofcdmaOnesystemswithSelectableModeVocoders(SMV)andantennadiversitytechniques.CDMA2000delivers4-8timeshighervoicecapacitythanTDMA-basedtechnologies.CDMA20001Xsupports35trafficch

7、annelspersectorperRF(26Erlangs/sector/RF)usingtheEVRCvocoder.Voicecapacityimprovementintheforwardlinkisattributedtofasterpowercontrol,lowercoderates(1/4rate),andtransmitdiversity(forsinglepathRayleighfading).Inthereverselink,capacityimprovementisprimarilyduetocoherentreverselink.For

8、moreinformationonCD