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1、英文资料原文INTRODUCTIONOFGSM一、GSMimplicationTheGSMfullnameis:GlobalSystemforMobileCommunications,Chineseasthewholeworldtwo-waychargesforcellularphonessystem,thepopularname"thewholeworldpasses",isonekindstemsfromEurope'smobilecommunicationtechnicalstandard,isthesecondgenerationofmobilecomm
2、unicationtechnology,itsdevelopmentgoalisenablestheworldtobepossibletouseamobilephonenetworkstandardtogether,letstheuseruseahandsettobeablegoodthewholeworld.Ourcountryusedthistechnicalstandardintheearly-1990sintroduction,beforethisusesthehoneycombsimulationmigrationtechnology,namelyth
3、efirstgenerationofGSMtechnology(onDecember31,2001ourcountryhasclosedsimulationmigrationnetwork).Atpresent,Chinamoves,ChinaUnicomtohaveaGSMnetrespectively,forworldbiggestmobilecommunicationnetwork.GSMsystemincludingGSM900:900MHz,GSM1800:1800MHzandGSM1900:1900MHzandsoonseveralfrequency
4、bands.GSM(wholeworldmobilecommunicationsystem)isonekindwidelyappliesinEuropeanandtheworldotherplacenumericmovetelephonesystem.WhatGSMuseisthetimedivisionmultipleaccessanomalousform,anditisthepresentthreekindofdigitalcordlessphonestechnology(TDMA,GSMandCDMA)usesthemostwidespreadonekin
5、d.GSMdigitizesthematerial,andcarriesonthedatathecompression,thentransmitstogetherwithothertwouserdatastreamfromthechannel,othertwouserdatastreamhastherespectivetimeslot.GSMinfactisEurope'sradiotelephonestandard,JointboardreportedaccordingtoGSMtheMOU,GSMhas1,200,000,000usersinthewhole
6、world,andtheuserproliferatesmorethan120countries.BecausemanyGSMnetworkoperatorhastheroamingagreementwithotheroverseasoperators,thereforeworksasuserafterothercountries,stillmightcontinuetousetheirmobilephone.AnAmericanFamousCorrespondenceCompanySprintAuxiliaryunit,theAmericanperson-to
7、-personcommunicationisusingGSMtotakeonekindofwidebandperson-to-personcommunicationservicethetechnology.Thiskindofperson-to-personcommunicationservicefinallyforEricsson,MotorolaaswellasNokiathehandsetwhichproducesisestablishingmorethan400basedepotsnow.Handsetincludestelephone,shortnot
8、ebeeperandin
