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首先简要介绍移动通信发展的历史和第三代移动通信系统的特点，然后重点介绍第四代移动通信系统的出现和关键技术，最后对第四代移动通信系统作了展望。
First of all, it briefly introduces the history of mobile communication and the characteristics of the third generation mobile communication system, and then introduces the emergence and key technologies of the fourth generation mobile communication system. Finally, the fourth generation mobile communication system is prospected.