CDMA2000反向业务信道的MATLAB仿真与实现

本科毕业设计题目：CDMA2000反向业务信道仿真及关键技术的研究性质：科研专业：电子信息工程日期：摘要移动通信是当今通信领域内最为活跃和发展最为迅速的领域之一，也是21世纪对人类的生活和社会发展将有重大影响的科学技术领域之一。cdma2000无线传输技术（RTT）是采用CDMA技术实现3G无线通信系统的一种宽带、扩频无线接口。cdma2000技术在IS-95技术基础上采用了一系列新技术，大大提高了系统性能。cdma2000采用的新技术包括多种射频信道带宽、前向链路的快速功率控制、Turbo编码、反向导频、反向链路相干解调和传输分集发射等。cdma2000可支持144kbit/s的传输速率，在核心网络引入分组交换技术，以支持未来的移动IP业务。cdma2000具有通信容量大；容量的软特性；减小多径衰落；链路传输速率快；平滑的软切换和有效的宏分集；低信号功率谱密度等技术特点。我所做的即是在本次仿真中应用MATLAB软件对其中物理层反向业务电路建模和仿真，根据cdma2000标准，详细的研究和描述了cdma2000的系统理论，性能特点和物理层反向传输电路的基本处理过程，并通过在实验室的软件仿真完成预定的功能，实现数据帧的物理层传输。关键词cdma2000；通信仿真；反向传输电路；MATLABAbstractNowadaysthemobilecommunicationtechnologyisoneofthemostactiveandexpandedcommunicationfieldsandoneofthemosteffectivetechnologyfieldswhichinfluencehumanbeingslivingandsocietydevelopmentfor21centuries.cdma2000RadioTransmissionTechnique(RTT)isakindofBroadBandandspreadradioaccesswhichadopttheCDMAtechniquetoimplementthe3Gradiocommunicationsystems.cdma2000technologieshaveadoptedaseriesofnewtechnologyonIS-95technologies,haveraisedthesystemperformanceconsumedly.cdma2000adoptnewtechnologiesincludemultipleRadioFrequencychannelbandwidths,forwardfastpowercontrol,Turboyard,reversepilot,reverseconcerningwithdemodulationanddiversitytransmissionetc.cdma2000canobtain144bit/stransportvelocity,hasgroup-changingmodeinthecorenetworkforfuturemobileIPoperation.cdma2000hasgreatcommunicationcapacity,softcharacteristicofsystemcapacity,smallerpathdecline,fastertransmissionrate,lowdensityofpowerspectrumofsignalandsmoothsoftswitchingandeffectivemacrodiversityetc.Accordingtocdma2000standard,inthisemulationwhatIdois,modelingandsimulationofreversetrafficcircuitwiththeapplicationMATLABsoftware,detailedresearchanddescribingofsystemtheoriesofcdma2000,performancecharacteristicsandbasichandlingprocedureofreversetrafficcircuit.Throughthesoftwaresimulationinthelaboratory,Icanfinishthescheduledfunctionandcarryoutthephysicallayertransmissionofthedataframe.Keywordscdma2000;communicationsystemsimulation;reversetransmissionchannel；MATLAB目录摘要.............................................................................................................IAbstract......................................................................................................II第1章绪论................................................................................................11.1课题背景..........................................................................11.2CDMA2000技术简介........................................................21.3课题内容..........................................................................31.4本章小结..........................................................................4第2章cdma20001x系统概述..............................................................52.1码分多址（CDMA）技术..............................................52.2CDMA20001X系统功能...................................................62.3CDMA20001X物理信道...................................................72.4CDMA20001X反向信道结构及总体仿真模型.............102.4.1CDMA20001X反向信道结构......................................102.4.2MATLAB介绍............................................................102.4.3总体仿真方案.............................................................112.5本章小结........................................................................12第3章cdma20001x反向信道编码与译码..........................................53.1CRC编码器与译码器......................................................53.2卷积编码器与译码器......................................................73.3信号交织器与解交织....................................................103.4初始化模块....................................................................113.5本章小结........................................................................14第4章cdma20001x反向信道调制与解调..........................................54.1正交扩频信号..................................................................53.2信号调制........................................................................154.2.1PN信号生成器............................................................154.2.2信号调制模块.............................................................184.2.3信号的解调模块.........................................................214.2.4信道模型的实现.........................................................234.3本章小结........................................................................24第5章运行仿真及调试分析..................................................................355.1设置仿真参数................................................................355.2仿真分析........................................................................355.3本章小结........................................................................38结论..........................................................................................................39参考文献....................................................................................................40中文译文：................................................................................................41外文原文：................................................................................................48致谢........