第四代移动通信系统的浅析与探讨—毕业论文.doc
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第四代移动通信系统的浅析与探讨
摘 要
本文从基本概念、接入系统等几个方面全面介绍了第四代移动通信系统,第代移动通信(4G)的特点及发展趋势,提出了实现4G移动通信需要解决的多项关键技术包括正交频分复用OFDM多载波传输技术、软件无线电技术、智能天线技术、多输入多输出技术(MIMO)、IP网络技术正交频分复用OFDM多载波传输技术4G系统的网络结构,它包括一个基于IP的核心网络和由几种接入系统组成的接入平台4G系统的基本要素完全集中的服务无所不在的移动接入不同的用户设备自治的网络第四代移动通信系统产生的背景分析了4G面临的问题,介绍了世界及我国对4G的关注对移动通信前20余年的发展略予回顾,指出其现状差强人意之处。阐述了当前世界各国相关业界对于新一代移动通信技术发展的一些要求、设想和探讨4G的技术前景探索随着社会的不断进步,对4G研究的不断深入,相信第四代移动通信系统与我们的距离将越来越小。具有高数据率、高频谱利用率、低发射功率、灵活业务支撑能力的未来无线移动通信系统(4G),必将是通往未来无线与移动通信系统的必然途径4G移动通正交频分复用?多模式终端无线接入网多媒体通信introduce the 4th generation mobile communication system by several history stage of the mobile communication development,it also introduce the mobile communication system and the character and develop trend of 4th generation communication (4G), it has some advantage compare with the former stages of mobile communication ,it propose several critical technology to realize the 4th generation communication ,including OFDM ,multi carrier wave transmit technology ,software wireless technology ,intelligent antenna technology ,MIMO,IP network technology ;specially discussing OFDM ,network struction of 4th G system ,it include a network based on IP core network and an access platform that constitute by several access system .and the basic elements of 4G system ,totally center service ,everywhere radio access ,different customer equipment ,autonomic network ;the generate background of 4th mobile communication ;some problem discussing of 4th mobile communication ,it introduce the focus of 4G by the world or China ,the review of the former 20 years development of mobile communication by analyzing the 4G facing problem.Elaborated the demand ,assume and discuss of the new generation mobile communication technology by related industry of international community,explored and prospected technology foreground of 4G.Along with the progress unremittingly of society ,study to the 4 G continuously thorough,believe the 4th mobile communication system and us distance will be mor
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