《通信科普》PPT课件

1、2011.10.01,2,Contact Method,Speaker TianJin University School Of Electronic And Information Engineering Address： Telephone： E-mail：,3,Rate,t,3G,2G,4G,Analog,Trend,4,Main Content,5,Main Content,6,1 First Generation Mobile Communication,Bored in 70s,Technology,FDMA,Analog voice modulation,7,FDMA Princ

2、iple,frequency,time,8,1 Features of 1G,Less secure,Analog cellular systems,Prone to Interference,Only carry voice traffic,Poor call quality,9,Main Content,10,2 2nd Generation,Be centre of voice transmission technology,GSM phone,CDMA phone,11,Cellular Networks,12,Cellular Networks,13,2G Merits,Digita

3、l cellular systems,Supporting high bit rate voice, limited data communication,Improved quality,14,Main Content,15,3 3rd Generation characteristic(1/6),Highest speed,enhance the quality and clarity,16,highlights of popular sports and shows,3 3rd Generation characteristic(2/6),Flexible wireless access

4、,17,Faster connectivity, music entertainment,better quality and faster access to the internet,3 3rd Generation characteristic(3/6),18,feature highlights of popular sports,3 3rd Generation characteristic(4/6),19,Movie clips,3 3rd Generation characteristic(5/6),20,Very quick downloads,3 3rd Generation characteristic(6/6),21,Main Content,22,4 Beyond 3G,Strong flexibility,High speed,Highly self-organizing and adaptive network,Green c