通信科普实用.pptx

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1、1Contact Method Speaker TianJin University School Of Electronic And Information Engineering Address:Telephone:E-mail:第1 页/共25 页2Rate Ratet t3G 3G 2G 2G4G 4GAnalogTrend第2 页/共25 页3Main Content First GenerationFirst Generation12nd Generation2nd Generation 2 3rd Generation3rd Generation 3Beyond 3GBeyond

2、 3G4第3 页/共25 页4Main Content First GenerationFirst Generation12nd Generation2nd Generation 2 3rd Generation3rd Generation3Beyond 3GBeyond 3G4第4 页/共25 页51 First Generation Mobile Communication Bored in 70s Bored in 70sTechnology TechnologyFDMA FDMAAnalog voice Analog voice modulation modulation第5 页/共2

3、5 页6FDMA Principlefrequency frequencytime time第6 页/共25 页71 Features of 1G1GLess secureAnalog cellular systemsProne to InterferenceOnly carry voice trafficPoor call quality 第7 页/共25 页8Main Content First GenerationFirst Generation12nd Generation2nd Generation 2 3rd Generation3rd Generation3Beyond 3GBe

4、yond 3G 4第8 页/共25 页92 2nd Generation Be centre of voice transmission technology Be centre of voice transmission technologyGSM phone GSM phoneCDMA phone CDMA phone第9 页/共25 页10Cellular Networks第10 页/共25 页11Cellular Networks第11 页/共25 页122G MeritsDigital cellular systemsSupporting high bit rate voice,li

5、mited data communicationImproved quality第12 页/共25 页13Main Content First GenerationFirst Generation12nd Generation2nd Generation 2 3rd Generation3rd Generation 3Beyond 3GBeyond 3G4第13 页/共25 页143 3rd Generation characteristic(1/6)Highest speed Highest speedenhance the quality and clarity 第14 页/共25 页15

6、highlights of popular sports and shows highlights of popular sports and shows3 3rd Generation characteristic(2/6)Flexible wireless access Flexible wireless access第15 页/共25 页16 Faster connectivity,music entertainment Faster connectivity,music entertainmentbetter quality and faster access to the inter

7、net3 3rd Generation characteristic(3/6)第16 页/共25 页17 feature highlights of popular sports 3 3rd Generation characteristic(4/6)第17 页/共25 页18 Movie clips3 3rd Generation characteristic(5/6)第18 页/共25 页19 Very quick downloads3 3rd Generation characteristic(6/6)第19 页/共25 页20Main Content First GenerationF

8、irst Generation12nd Generation2nd Generation 2 3rd Generation3rd Generation3Beyond 3GBeyond 3G 4第20 页/共25 页214 Beyond 3GStrong flexibilityStrong flexibility High speedHigh speed Highly self-organizing and adaptive networkHighly self-organizing and adaptive networkGreen communicationGreen communication 第21 页/共25 页224 4GHigh speedHigh speed 第22 页/共25 页234 Green communication 第23 页/共25 页24Thank you 第24 页/共25 页25感谢您的观看!第25 页/共25 页

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