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1、浅谈关于移动通信发展趋势_外文翻译大连科技学院毕业设计论文外文翻译学生姓名李婷专业班级信息工程09(2)班指导教师扬扬职称讲师所在单位电气工程系教研室主任石桂名完成日期2013年4月12日TalkaboutthedevelopmenttrendformobilecommunicationsOne,introduction:Mobilecommunicationmeansbetweenthemobileusers,ormobileusersandfixedcommunicationsbetween.,Withthedevelopmentofele
2、ctronictechnology,particularlysemiconductors,setsDevelopmentofcircuitandcomputertechnologyandmobilecommunicationshaveenjoyedrapiddevelopment.Withtheexpansionofitsapplicationfieldsandonimprovingtheperformancerequirements,allowmobilecommunicationintechnologyanddevelopmentofthe
3、theorytoahigherlevel.Sinceinthe1980softhe20thcentury,themobilecommunicationshavebecomeindispensableinmoderncommunicationnetworkandoneofthefastestmeansofcommunication.Reviewingthedevelopmentofmobilecommunications,mobilecommunicationsdevelopmentthroughseveralstagesofdevelopmen
4、t:thefirstmajorcellularmobilecommunicationtechnologyofanalogmobilecommunications,thetechnicalcharacteristicsofCellularnetworkstructureovercometheregionalcapacitylow,restrictedthescopeofactivitiesoftheproblem.SecondGisthecellularmobilecommunications,cellularsystemscanprovidei
5、ntegratedservicedigitaltransmission,andotheradvantages.MainCharacteristicsofthirdGisinadditiontoprovidingsecondofmobilecommunicationsystemownadvantages,overcomeitsshortcomings,butcanalsoprovidebroadbandmultimediaservicecanprovidehigh-qualityvideomultimediaintegratedservices,
6、andglobalroaming.Withmostofthemarenowsecondtechnology,thirdtechnologyisstillnotverysuccessful.buttherearealreadyfourthtechnologyvision.4Gstandardwithmorethanthirdofthefourthmobilecommunicationsystemfunction.。Two.4Gaboutmobilecfourththeconceptofmobilecommunicationtechnologies
7、asbroadbandaccessanddistributionnetwork,withasymmetryover2Mbitsdatatransmissioncapacity.Itconsistsoffixedbroadbandwirelessaccessandbroadbandwirelesslocalareanetwork,mobilebroadbandsystemandinteractivebroadcastingnetwork.fourthGstandardsthanthirdstandardhasmorefunctionality.I
8、ndifferentfixedfourthg,wirelessplatformsandwirelessservicesacrossdifferentf
