毕业论文：蜂窝移动的过去、现在与将来.doc

蜂窝移动的过去、现在与将来 通信工程系 中文摘要 蜂窝通信技术发展之快令人惊叹，经过近十年多的时间，中国的第一代蜂窝移动通信系统已基本淘汰，第二代的GSM （Group Special Mobile)网络已经发展成为世界上最大的蜂窝移动通信网络。而目前人们期待的3G （ 3rd Generation )虽未完全商化，但已处于发展阶段。蜂窝网移动通信技术即移动通信中除单区制和多区制外更好的一种，有着非常好的应用前景，也是第二代移动通信的支柱。 本文首先介绍了“蜂窝移动导论、现代通信技术、移动通信的不同分类及模拟蜂窝通信和数字蜂窝通信的相关知识”，更重要的是要突出蜂窝移动通信的发展历程：过去的第一代蜂窝移动通信系统，现在的GSM网络和将来的3G系统甚至4G( 4th Generation)系统。重点针对蜂窝移动通信的总发展趋势作出展望，使人们较清晰地了解到现代蜂窝网移动通信系统。 关键词： 蜂窝通信 模拟系统 数字系统 3G GSM Abstract  Cellular communication technology s rapid development has amazed us. After nearly a decades time, Chinas first generation of cellular mobile communication system has been basically eliminated, the second-generation GSM (Group Special Mobile) network has grown to become the worlds largest cellular mobile communications network. At present, people are looking forward to the 3G (3rd Generation), although not fully business-oriented, it is at the development stage. Cellular mobile communication technology of mobile communications, in addition to single-zone system and multi-zone system, a better outside, has a very good prospect, is the second-generation mobile communications backbone. This article first introduces the Introduction to cellular mobile, modern communication technology, mobile communications, the different classification and analog cellular communications and digital cellular communications-related knowledge, but more importantly to highlight the course of development of cellular mobile communications: In the past the first generation of cellular mobile communication system, the existing GSM network and future 3G systems and even 4G (4th Generation) systems. We will focuse on the overall prospects for the development trend of cellular mobile communications to make people understand the modern cellular mobile communication system more clearly. Keywords:  Cellular、 Simulation 、 Digital 、System 、 3G 、 GSM 目