通信类毕业设计论文——第四代移动通信(4G)的发展和前景.doc

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毕业设计说明书(论文)
第四代移动通信(4G)的发展和前景
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二○**年XX月
摘要
随着3G标准格局的基本形成,国际电联(ITU)开始研究和展望第4代(4G)移动通信,以提供更有效的多种业务。它能达到更快的数据传输速率,提供优质多样而价格低廉的服务。在第三代移动通信系统开展应用的同时,关于第四代移动通信系统的研究已全面展开。目前世界发达国家都在积极进行第四代移动通信技术规格的研究制定工作。通过从4G移动通信系统的产生背景以及特点引入,本文简要的分析了第三代移动系统存在的不足,提出了第四代移动通信系统的概念并详细的介绍了4G的定义。对第四代移动通信系统的起源、发展、特点,及世界上一些主要国家的研究进展作了介绍,并讨论了第四代移动通信系统可能涉及的几种关键技术:OFDM、软件无线电以及智能天线技术。同时介绍了移动通信的发展状况、第4代移动通信的特点,分析了实现未来第4代移动通信系统所面临的问题。
关键词: 4G移动通信系统网络结构关键技术软件无线电无线接入
ABSTRACT
Along with the basic formation of 3G standard structure and form,the ITU (international electricity union) begins to study and view the fourth generation munication (4G) for providing more effectively various business. 4G wireless technology can offer higher data transmission rates,various high-quality and cheaper services. While the third generation munication system is applied,the study of the fourth generation munication has begun. At present,the developed country in the world throw themselves into the research and establishment of the standard for 4G munication technology. Starting with the background of the fourth generation munication system and its characteristic, this paper briefly analyzed some shortages exist in the third generation munication system,brought forward the concept of the fourth generation munication and introduced the definition. The origin,characteristics,and development of the fourth generation munication in some countries are introduced in this paper. The related key techniques such as OFDM,Software Defined Radio,Smart Antenna. Simultaneously introduces the development status of munication and the characteristic of the fourth generation munication, then analyzes the problem of the future fourth munication system.
Key words: 4G munication work frame key techniques software radio wireless access
目录
1绪论 1
1
(4G)研究的背景 2
2
2
2第四代移动通信系统的目标和主要特征 5
5