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ID:327022
大小:33.59 KB
页数:10页
时间:2017-07-24
《CDMA2000优点-外文翻译》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、附录4外文资料AdvantagesofCDMA2000CDMA2000benefitedfromtheextensiveexperienceacquiredthroughseveralyearsofoperationofcdmaOnesystems.Asaresult,CDMA2000isaveryefficientandrobusttechnology.Itdeliversthehighestvoicecapacityanddatathroughputusingtheleastamountofspectrum,anditcanbeusedtoprovideservicesinurban
2、aswellasremoteareascosteffectively.Theuniquefeatures,benefits,andperformanceofCDMA2000makeitanexcellenttechnologyforhigh-voicecapacityandhigh-speedpacketdata.SinceCDMA20001Xsupportsbothvoiceanddataservicesonthesamecarrier,itallowsoperatorstoprovidebothservicescostefficiently.CDMA20001xEV-DOisopti
3、mizedfordataandiscapabletosupportlargevolumesofdatatrafficatbroadbandspeeds.1xEV-DOiswellsuitedtoprovidehigh-speeddataservicestoitsmobilesubscribersand/orbroadbandaccesstotheInternet.Duetoitsoptimizedradiotechnology,CDMA2000enablesoperatorstoinvestinfewercellsitesanddeploythemfaster,ultimatelyall
4、owingtheserviceproviderstoincreasetheirrevenueswithfasterReturnOnInvestment(ROI).TheCDMA2000evolutionarypathwasdesignedtominimizeinvestmentandtheimpacttoanoperator’snetworkwithoutserviceinterruptionfortheend-user.Thishasbeenachievedthroughbackwardandforwardcompatibility,hardwarereuse,in-bandmigra
5、tionandhybridnetworkconfiguration.ThisuniquefeatureofCDMA2000technologieshasprovidedoperatorsasignificanttime-to-marketadvantageoverother3Gtechnologies.IncreasedVoiceCapacityThespectralefficiencyofCDMA20001Xpermitshightrafficdeploymentsinasmallamount(1.25MHzchannel)ofspectrum.CDMA20001Xcanprovide
6、voicecapacityofnearlythreetimesthatofcdmaOnesystemswithSelectableModeVocoders(SMV)and10antennadiversitytechniques.CDMA2000delivers4-8timeshighervoicecapacitythanTDMA-basedtechnologies.CDMA20001Xsupports35trafficchannelspersectorperRF(26Erlangs/sector/RF)usingtheEVRCvocoder.Voicecapacityimprovemen
7、tintheforwardlinkisattributedtofasterpowercontrol,lowercoderates(1/4rate),andtransmitdiversity(forsinglepathRayleighfading).Inthereverselink,capacityimprovementisprimarilyduetocoherentreverselink.FormoreinformationonCD
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