摘要：4g指的是第四代移动通信技术。
Abstract: : 4g refers to the fourth generation mobile communication technology.
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.
作为第四代移动通信的核心技术，正交频分复用(OFDM)系统愈来愈引起业界的普遍关注。
As a key technology for 4 ~ (th) Generation wireless mobile communication system, OFDM has drawn more and more attention in communication fields.
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