浅谈关于移动通信发展趋势-毕业论文外文翻译

浅谈关于移动通信发展趋势-毕业论文外文翻译

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时间:2017-07-11

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1、TalkaboutthedevelopmenttrendformobilecommunicationsOne,introduction:Mobilecommunicationmeansbetweenthemobileusers,ormobileusersandfixedcommunicationsbetween.,Withthedevelopmentofelectronictechnology,particularlysemiconductors,setsDevelopmentofcircuitandcomputertechn

2、ologyandmobilecommunicationshaveenjoyedrapiddevelopment.Withtheexpansionofitsapplicationfieldsandonimprovingtheperformancerequirements,allowmobilecommunicationintechnologyanddevelopmentofthetheorytoahigherlevel.Sinceinthe1980softhe20thcentury,themobilecommunications

3、havebecomeindispensableinmoderncommunicationnetworkandoneofthefastestmeansofcommunication.Reviewingthedevelopmentofmobilecommunications,mobilecommunicationsdevelopmentthroughseveralstagesofdevelopment:thefirstmajorcellularmobilecommunicationtechnologyofanalogmobilec

4、ommunications,thetechnicalcharacteristicsofCellularnetworkstructureovercometheregionalcapacitylow,restrictedthescopeofactivitiesoftheproblem.SecondGisthecellularmobilecommunications,cellularsystemscanprovideintegratedservicedigitaltransmission,andotheradvantages.Mai

5、nCharacteristicsofthirdGisinadditiontoprovidingsecondofmobilecommunicationsystemownadvantages,overcomeitsshortcomings,butcanalsoprovidebroadbandmultimediaservicecanprovidehigh-qualityvideomultimediaintegratedservices,andglobalroaming.Withmostofthemarenowsecondtechno

6、logy,thirdtechnologyisstillnotverysuccessful.buttherearealreadyfourthtechnologyvision.4Gstandardwithmorethanthirdofthefourthmobilecommunicationsystemfunction.。Two.4Gaboutmobilecfourththeconceptofmobilecommunicationtechnologiesasbroadbandaccessanddistributionnetwork,

7、withasymmetryover2Mbitsdatatransmissioncapacity.Itconsistsoffixedbroadbandwirelessaccessandbroadbandwirelesslocalareanetwork,mobilebroadbandsystemandinteractivebroadcastingnetwork.fourthGstandardsthanthirdstandardhasmorefunctionality.Indifferentfixedfourthg,wireless

8、platformsandwirelessservicesacrossdifferentfrequencybandnetwork,inanyplacewithbroadbandInternetaccess,includingsatellitecommunicationandst

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