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本文首先对前三代移动通信系统作了简单的介绍,并指出了它们的不足,接着说明了第四代移动 通信的主要技术特点和关键技术,最后论述了第四代移动通信系统的安全问题。
This paper first introduces the first three generations of mobile communication system briefly, and points out their shortcomings. Then it explains the main technical features and key technologies of the fourth generation mobile communication, and finally discusses the fourth generation mobile communication system security issues.