说明：  本文主要介绍CDMA 有关的基础知识，诸如：CDMA 发展简史、CDMA 关键 技术、CDMA 系统结构及相关接口、CDMA 的区域定义及编号计划、CDMA 系统功能、以及CDMA 移动网络结构和信令网结构等。
(This article describes the basics of CDMA-related, such as: CDMA development history, CDMA key technologies, CDMA system architecture and related interfaces, CDMA regional definition and numbering plan, CDMA system function, as well as the CDMA mobile network architecture and signaling network structures.)