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1、一、英文原文ModernmobilecommunicationtechnologyInnowhighlytheinformationsociety,theinformationandthecorrespondencehavebecomethemodernsociety“thelife”.Theinformationexchangemainlyreliesonthecomputercorrespondence,butcorrespondstakesthetransmissionmethod,withthesen
2、singtechnology,thecomputertechnologyfusesmutually,hasbecomeinthe21stcenturytheinternationalsocietyandtheworldeconomicdevelopmentpowerfulengine.Inordertoofadaptthetimerequest,thenewgenerationofmobilecommunicationtechnologyseasonableandlives,thenewgenerationo
3、fmobilecommunicationtechnologyisthepeoplesaidthatthirdgeneration'scorecharacteristicisthewidebandaddressingturnsonnon-gaproamingbetweentherigidnetworkandnumerousdifferentcommunicationssystem's,gainsthemultimediacommunicationservices.Alongwiththetimeprogress
4、,thetechnicalinnovation,people'sliferequest'senhancement,themobilecommunicationtechnologyrenewalspeedisquiteastonishing,almosteveryothertenyearmobilecommunicationtechnologyhasatransformationupdate,fromthe1980s“themobilephone”topresent's3Ghandset,duringhasha
5、dtwomobilecommunicationtechnologytransformation,transitsfrom1GAMPSto2GGSM,fromGSMtoIMT-2000(i.e.3Gtechnology).Knowsmodernonmethemobilecommunicationtechnologytohavethefollowingseveralaspectimportanttechnology:1.widebandmodulationandmultipleaccesstechniqueThe
6、wirelesshighspeeddatatransmissioncannotonlydependonthefrequencyspectrumconstantlytheexpansion,shouldbehigherthanthepresentnumbermagnitudeatleastinthefrequencyspectrumefficiency,mayusethreetechnologiesinthephysicallevel,namelyOFDM,UWBandfreetimemodulationcod
7、e.OFDMwithotherencodingmethod'sunion,nimblyOFDMandTDMA,FDMA,CDMA,SDMAcombinesthemultipleaccesstechnique.Inthe1960stheOFDMmulti-channeldatatransmissionhassucceededusesincomplexandtheKathrynhighfrequencymilitarychannels.OFDMhasusedin1.6Mbit/shighbitratedigita
8、lsubscriberline(HDSL),6Mbit/sasymmetricaldigitalsubscriberline(ADSL),100Mbit/sreallyhighspeedfiguresubscriber'sline(VDSL),digitalaudiofrequencybroadcastanddigitalvideobroadcastandsoon.OFDMapplieson5GHz
