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ID:9854030
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时间:2018-05-12
《外文翻译---宽带cdma无线接入网的基本概念》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、时光荏苒,岁月如白驹过隙,不经意间,我们即将从多彩的大学毕业,完成一个从大学生到社会人的转变。四年的大学生涯,让我明白了许许多多的科学知识和人生哲理,以及数不尽的感悟和成长。然只有将所学的理论知识付诸于社会的实践,才能检验和实现理论自身的价值,也只有将理论付诸于实践才能使理论得以检验。同样,一个人的价值也是通过实践活动来实现的,也只有通过实践才能锻炼人的品质,彰显人的时代风貌。而毕业实习作为大学的最后一课,也是最后一刻,我倍加珍惜,从而可以较深层次的理解社会,以便为将来能更好的胜任工作打下坚实的基础。附录3:
2、英文资料BasicConceptsofWCDMARadioAccessNetwork1.BackgroundTherehasbeenatremendousgrowthinwirelesscommunicationtechnologyoverthepastdecade.Thesignificantincreaseinsubscribersandtraffic,newbandwidthconsumingapplicationssuchasgaming,musicdownloadingandvideostreami
3、ngwillplacenewdemandsoncapacity.Theanswertothecapacitydemandistheprovisionofnewspectrumandthedevelopmentofanewtechnology-WidebandCDMAorhereinafterreferredtoasWCDMA.WCDMAwasdevelopedinordertocreateaglobalstandardforrealtimemultimediaservicesthatensuredinter
4、nationalroaming.WiththesupportofITU(InternationalTelecommunicationUnion)aspecificspectrumwasallocated-20Hzfor3Gtelecomsystems.Theworkwaslatertakenoverbythe3GPP(3rdGenerationPartnershipProject),whichisnowtheWCDMAspecificationbodywithdelegatesfromalloverthewo
5、rld.2.WCDMAadevelopmentfromGSMandCDMANaturallytherearealotofdifferencesbetweenWCDMAandGSMsystems,huttherearemanysimilaritiesaswell.TheGSMBaseStationSubsystem(BSS)andtheWCDMARadioAccessNetwork(RAN)arebothconnectedtotheGSMcorenetworkforprovidingaradioconnecti
6、ontothehandset.Hence,thetechnologiescansharethesamecorenetwork.Furthermore,bothGSMBSSandWCDMARANsystemsarebasedontheprinciplesofacellularradiosystem.TheGSMBaseStationController(ESC)correspondstotheWCDMARadioNetworkController(RNC).TheGSMRadioBaseStation(RBS)
7、correspondstotheWCDMARES,andtheA-interfaceofGSMwasthebasisofthedevelopmentoftheIu-interfaceofWCDMA,whichmainlydiffersintheinclusionofthenewservicesofferedbyWCDMA.Thesignificantdifferences,apartfromthelackofinterfacebetweentheGSMBSCsandGSMAbis-interfacetopro
8、videmulti-vendoroperability,aremoreofasystemicmatter.TheGSMsystemusesTDMA(Time时光荏苒,岁月如白驹过隙,不经意间,我们即将从多彩的大学毕业,完成一个从大学生到社会人的转变。四年的大学生涯,让我明白了许许多多的科学知识和人生哲理,以及数不尽的感悟和成长。然只有将所学的理论知识付诸于社会的实践,才能检验和实现理论自身的价值,也
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