Therefore, the major mobile operators are actively building a third-generation mobile communications networks.

因此，各大移动运营商都在积极建设第三代移动通信网络。

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Performance simulation is very important to the research of smart antenna technology, which is one of the key technologies in third generation mobile communications.

性能仿真对于作为第三代移动通信关键技术之一的智能天线技术的研究具有十分重要的意义。

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As voice communications is the primary media of communication for human being, it plays a very important role from public switched telephone network to the third generation mobile communications.

话音是人与人之间交流的主要方式，从最早出现公共交换电话网络到现在的第三代移动通信，语音通信是其最基本的功能。

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