在电信中，4g是手机的移动通信技术标准的第四代。
In telecommunications, 4g is the fourth generation of mobile phone mobile communication technology standards.
原因之一是在20世纪30年代还没有互联网和移动通信技术。
One reason is that that there was no Internet or mobile technology in the 1930s.
软件无线电技术已经成为第三代移动通信系统中的关键技术。
SR technology has been the key technology of the 3rd generation mobile communication system.
何为第三代移动通信技术的定义?。
What's the definition of the third generation mobile telecommunications?
目前，第三代移动通信正在致力于开发智能天线系统。
Now, smart antenna system has being developed for the Third Generation Mobile Communication (3G).
第三章研究了第四代移动通信演进现状。
Chapter 3 studies the evolution status for Fourth Generation of Mobile Communication.
本文着重研究了第三代移动通信系统的安全。
This paper is devoted to the security of 3g mobile communication system.
智能天线是第三代移动通信的关键技术之一，也是当前信号处理和通信领域的研究热点。
It is also one of the current focuses in the signal processing and communication field.
蜂窝数字分组数据通信网(CDPD)是新一代移动无线数据通信技术。
CDPD is a new kind of mobile wireless data communication technology.
因此，国内各大移动运营商都在积极部署第三代移动通信系统。
Therefore, each large mobile operator is deploying the third generation mobile system.
因此，国内各大移动运营商都在积极部署第三代移动通信系统。
Therefore, each large mobile operator is deploying the third generation mobile system.
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