移动通信
2020-03-03 09:38:46 来源：范文大全收藏下载本文
The Mobile communication
Yunhui Wu200830800224
The Mobile communication is kind of communication between the mobile body, or between Mobile body and fixed body.Mobile body can be people, also can be moving objects like the cars, trains, ships, radio and so on 。
Mobile Communications consists of two parts：Space systems and Ground system：Mobile satellite radio and antennas;gateways, base stations
The development of mobile communication technology
The first generation of mobile communication is given priority to simulation technology, only provides the voice busine, no international standard;
The second generation of mobile communications have been full digital, in addition to the voice, low speed of data transmiion busine can be transported, can roaming, basically have two big international standard GSM and CDMA ；The third generation of mobile communications combine wirele communications and multimedia
technologies together to deal sounds, music, images, video streaming and other forms of data more quickly, and provide a variety of information services that connect with internet, there are three major international standards :WCDMA, CDMA2000 and TD-SCDMA。
The fourth generation of mobile communication
4G also known as broad band acce and distribution network, which includes wide band wirele fixed acce, broad band wirele LAN.
Wide band mobile radio system and interoperability network, is an integrated system gather a variety of wirele technologies and wirele LAN system.It is also the broadband IP acce system, mobile users can achieve this seamle global roaming on the system to further improve its efficiency, Meet high rate, the large capacity needs of the busine, and overcome the high-speed data in a radio channel of the multipath fading and multipath interference and many other advantages.
The key technology of 4 G
OFDM technology
MIMO technology
Switching technology
Software radio technology
IPv6 agreement technologyG development trend
In the future of mobile communications will have the characteristics of high-speed, high-quality data transmiion, completely focused on the basic services and so on.With the new iues, new requirements arise.The fourth-generation of mobile communications technology will adjust, improve and further develop, I believe the near future; people will be independent of time and place, free to use the mobile
network to acce and transport information, making people\'s study, work and life has more profound changes.
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