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四川理工学院毕业设计（论文）WCDMA系统分析及其扩频系统仿真学生：杨晓英学号：08021030330专业：通信工程班级：2008.3指导教师：周顺勇四川理工学院自动化与电子信息学院二0一二年六月杨晓英：WCDMA系统分析及其扩频系统仿真I摘要本论文的核心在于基于MATLAB的WCDMA扩频系统仿真分析，该系统的扩频部分使用了目前普遍使用的直接序列扩频技术。论文首先介绍移动通信系统的发展历程和3G现状、分析WCDMA的系统，然后对WCDMA系统中的扩频技术进行详细论述，最后对WCDMA中的扩频通信基于Simulink的仿真，实现了信号的产生、扩频、解扩、加扰、解扰、调制、解调等部分。仿真部分主要在此基础上对理想条件下普通扩频和加入强干扰条件下的扩频通信进行比较，并对对强干扰条件下的参数进行了改进。关键词：WCDMA；扩频；Simulink；强干扰四川理工学院本科毕业论文IIABSTRACTThisthesisofWCDMAcoreisbasedontheMATLABsimulationanalysisofspreadspectrumsystems,spreadspectrumofpartsofthesystemusingthecommonlyuseddirect-sequencespread-spectrumtechnology.Paperfirstdescribestheevolutionofmobilecommunicationsystemand3GpresentsituationandanalysisofWCDMAsystem,theninWCDMAsystemsofspreadspectrumtechnologyindetail,lastonspreadspectrumcommunicationbasedonSimulinksimulationinWCDMA,realizationofsignalgeneration,spreadspectrum,despreading,scrambling,andsolution-talk,modulation,demodulation,andotherparts.Simulationpartonthisbasisunderidealconditionsofspreadspectrumandjoinedundertheconditionofstronginterferencespreadspectrumcommunicationandimprovementonhighinterferenceconditionparameters.Keywords:WCDMA;Spreadspectrum;Simulink;Stronginterference杨晓英：WCDMA系统分析及其扩频系统仿真III目录摘要................................................................................................................................IABSTRACT.....................................................................................................................II第1章绪论.................................................................................................................11.1移动通信系统的发展历程和3G的现状.........................................................11.2WCDMA的产生和发展历程............................................................................31.33G移动通信技术方案的比较..........................................................................4第2章WCDMA系统....................................................................................................62.1WCDMA通信系统的基本模型和主要参数....................................................62.2WCDMA系统模型分析....................................................................................72.2.1信源编码与解码.....................................................................................72.2.2信道编码交织与去交织信道解码.........................................................82.2.3扩频与解扩.............................................................................................92.2.4加扰与解扰...........................................................................................102.2.5调制与解调...........................................................................................10第3章WCDMA系统中的扩频调制技术...................................................................123.1上行链路的扩频/调制....................................................................................123.2下行链路的扩频/调制....................................................................................133.3直接序列扩频通信..........................................................................................143.3.1直接序列扩频技术概述......................................................................143.3.2直接序列扩频通信系统的原理..........................................................143.3.3直接序列扩频的主要技术优点..........................................................16第4章基于MATLAB的WCDMA系统的扩频方案..............................................174.1SIMULINK简介..................................................................................................174.2SIMULINK的功能..............................................................................................174.3直接序列扩频系统的总设计模型..................................................................184.4解扩与检波......................................................................................................22第5章仿真参数设置以及结果分析...........................................................................235.1扩频系统中主要通信工具箱简介..................................................................23四川理工学院本科毕业论文IV5.2参数设置..........................................................................................................255.3仿真结果分析..................................................................................................295.3.1理想状态下的仿真结果分析...............................................................295.3.2在强干扰条件下的仿真结果分析......................................................345.3.3在强干扰条件下扩频系统的改进......................................................38结束语.............................................................................................................................40致谢...............................................................................................................................41参考文献.........................................................................................................................42附录：WCDMA系统扩频系统仿真模型总框图......................................................43杨晓英：WCDMA系统分析及其扩频系统仿真1第1章绪论1.1移动通信系统的发展历程和3G的现状从移动通信的诞生到今天，移动通信已经有100多年的历史了。近十几年来，移动通信的发展极为迅速，大规模集成电路技术的不断进步，新的超大规模集成电路技术的产生和其它便携移动设备做得更小巧、更可靠。在这些新技术的推动下，无线通信技术获得了巨大的发