通信科普PPT课件

.,2011.10.01,.,2,ContactMethod,SpeakerTianJinUniversitySchoolOfElectronicAndInformationEngineeringAddress：Telephone：E-mail：,.,3,Rate,t,3G,2G,4G,Analog,Trend,.,4,MainContent,.,5,MainContent,.,6,1FirstGenerationMobileCommunication,Boredin70s,Technology,FDMA,Analogvoicemodulation,.,7,FDMAPrinciple,frequency,time,.,8,1Featuresof1G,Lesssecure,Analogcellularsystems,PronetoInterference,Onlycarryvoicetraffic,Poorcallquality,.,9,MainContent,.,10,22ndGeneration,Becentreofvoicetransmissiontechnology,GSMphone,CDMAphone,.,11,CellularNetworks,.,12,CellularNetworks,.,13,2GMerits,Digitalcellularsystems,Supportinghighbitratevoice,limiteddatacommunication,Improvedquality,.,14,MainContent,.,15,33rdGenerationcharacteristic(1/6),Highestspeed,enhancethequalityandclarity,.,16,highlightsofpopularsportsandshows,33rdGenerationcharacteristic(2/6),Flexiblewirelessaccess,.,17,Fasterconnectivity,musicentertainment,betterqualityandfasteraccesstotheinternet,33rdGenerationcharacteristic(3/6),.,18,featurehighlightsofpopularsports,33rdGenerationcharacteristic(4/6),.,19,Movieclips,33rdGenerationcharacteristic(5/6),.,20,Veryquickdownloads,33rdGenerationcharacteristic(6/6),.,21,MainContent,.,22,4Beyond3G,Strongflexibility,Highspeed,Highlyself-organizingandadaptivenetwork,Greencommun