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本文首先介绍ＣＤＭＡ、ＴＤＭＡ和ＦＤＭＡ这三种移动通信多址方式的差异，并介绍目前在数字蜂窝移动通信中，使用直接序列扩谱（ＤＳ－ＳＳ）ＣＤＭＡ的基本原理，在上述基础上简单介绍目前市场推出的窄带ＣＤＭＡ蜂窝移动电话系统，并探讨其容量、分析功率控制对容量的关系，最后，介绍ＣＤＭＡ蜂窝移动电话的自然属性，它对增加容量，提高通信服务质量等方面的一些好处。
This paper first introduces the differences between CDMA, TDMA and FDMA, and introduces the basic principles of direct sequence spread spectrum (DS-SS) CDMA currently used in digital cellular mobile communications. Based on the above brief introduction At present, the narrowband CDMA cellular mobile phone system introduced in the market is discussed and its capacity is analyzed. The relationship between power control and capacity is analyzed. Finally, the natural attributes of CDMA cellular mobile phone are introduced. Some advantages are gained from the increase of capacity and communication service quality.