摘要
人们不断扩大的需要和科学技术的日新月异 ,促进了移动通信技术的飞速发展。经过几十年的发展 ,移动通信技术已从第一代的模拟网发展到数字网。现在又向全新的第三代系统迈进。本文主要介绍了移动通信发展的几个阶段的主要产品类型、原理及其性能的比较。
Due to the development of science and technology and the increasing demands of people,mobile communication technology has progressed rapidly.It has developed from the first generation-analogy networks to digital net works through many years'development.Today,it is marching into the third generation.This thesis mainly introduces the main types of mobile communication products,its principles and comparisons of quality between them at different development phases.
关键词
CDMA
GSM
移动通信
频分多址
时分多址
码分多址
frequency division multiple access(FDMA)
time division multiple access(TDMA)
code division multiple access(CDMA)
globe system for mobile communications(GSM)
