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摘要-1-摘要TD-SCDMA是由我国提出的拥有自主知识产权的第三代移动通信标准，是ITU认可的三大主流标准之一。国家对TD-SCDMA的投入逐渐加大，政策的鼓励对TD-SCDMA整个产业的发展起到巨大的推动作用，对TD-SCDMA的研究已成为通信领域的研究热点。在进行TD-SCDMA研究过程中，使用通信仿真软件对TD-SCDMA系统进行建模，并实现对各种新技术和算法进行理论分析的验证是很有效的方法。本文在阅读了大量国内外关于TD-SCDMA技术和搭建仿真平台方法的文献的基础上，综述了TD-SCDMA系统的网络结构、物理层结构和TD-SCDMA的关键技术；设计了TD-SCDMA系统仿真平台的总体结构，将仿真平台分为链路级仿真和系统级仿真两部分，并对仿真平台中各部分的组成模块进行了初步探讨。对TD-SCDMA系统的编码与调制进行了深入的研究，并用MatlabR2008a的SIMULINK工具箱搭建了一个TD-SCDMA基站发射机仿真模块；对该模块进行了仿真，仿真结果表明，本文搭建的基站发射机仿真模块卷积编码前后的比特数符合文献[3]中提到的H=3I+24的关系；产生的基带调制信号的频谱在抑制频谱范围内的衰减幅度在40dB以上，这与文献[24]的要求是一致的。该仿真模块可以作为以后继续研究的基础。本文的工作和结论为搭建TD-SCDMA系统仿真平台提供了参考。关键词：TD-SCDMA；仿真平台；链路级仿真；系统级仿真；基站发射机ABSTRACT-2-ABSTRACTTD-SCDMA,thethirdgenerationmobilecommunicationstandardthatChinaputsforwardandholdstheindependentintellectualpropertyrights,isoneofthethreeprimarystandardscertificatedbyITU.ThestategraduallyincreasestheinvestmenttoTD-SCDMA.Theencouragementofthepolicywilltrulyhaveatremendouspromotingeffectonthedevelopmentofthewholeindustrial,andthestudyonTD-SCDMAhasbeenahotspotinthecommunicationfield.ItisaveryeffectivewaytousecommunicationssimulationsoftwareforTD-SCDMAsystemmodelingduringthecourseofresearchingTD-SCDMA,itcanalsoverifythetheoreticalanalysisofvariousnewtechnologiesandalgorithms.AfterreadingalargenumberofdomesticandforeignpapersonTD-SCDMAtechnologyandconstructionmethodsofsimulationplatform,thispapersummarizesTD-SCDMAsystem’snetworkarchitecture,physicallayerarchitectureandit’skeytechnologies.ThenwedesigntheoverallstructureofTD-SCDMAsystem’ssimulationplatformwhichisdividedintolink-levelsimulationandsystem-levelsimulation,andthesimulationplatform’svariouspartsofthecomposedmodulesarediscussedpreliminarily.Afteranin-depthstudyofTD-SCDMAsystem’sencodingandmodulation,thispaperdesignsasimplesimulationmoduleforthebasestationtransmitterofTD-SCDMA.AndthemoduleisrealizedbyMatlabR2008a’stoolboxSIMULINK.Wesimulatethemoduleandtheresultsshowthatthenumberoffore-and-aftbitsofconvolutionalcodingaccordwiththerelationshipofH=3I+24whichismentionedinpaper[3],andthebaseband’sspectrumproducedbythetransmitterdecaysinmorethan40dBwithintheframeworkofinhibitionspectrum,whichbasicallymeetthetermsofthepaper[24].Asaresult,thesimulationmodulewillserveasthebasisforthefutureresearch.ThelaborandharvestofthepaperprovidereferencefordesigningthesimulationplatformofTD-SCDMAsystem.KEYWORDS：TD-SCDMA;SimulationPlatform;Link-levelSimulation;System-levelSimulation;BaseStationTransmitter目录-1-目录第一章绪论...................................................................................................-1-1.1第三代移动通信系统简介...............................................................-1-1.2课题背景...........................................................................................-3-1.3课题意义...........................................................................................-4-第二章TD-SCDMA系统简介.....................................................................-6-2.1TD-SCDMA网络结构......................................................................-6-2.1.1网络结构概述.........................................................................-6-2.1.2UTRAN的基本结构...............................................................-7-2.2TD-SCDMA物理层..........................................................................-9-2.2.1物理层接口.............................................................................-9-2.2.2物理层功能和向上层提供的服务.........................................-9-2.2.3物理信道...............................................................................-10-2.3TD-SCDMA系统关键技术............................................................-13-第三章仿真平台说明.................................................................................-16-3.1通信系统仿真技术概述.................................................................-16-3.2Matlab和SIMULINK介绍............................................................-16-3.3仿真平台总体结构.........................................................................-18-3.4链路级仿真.....................................................................................-19-3.5系统级仿真.....................................................................................-21-3.5.1仿真场景...............................................................................-21-3.5.2用户移动模型.......................................................................-23-3.5.3仿真业务模型.......................................................................-23-3.5.4仿真衰落模型.......................................................................-24-第四章TD-SCDMA系统编码与调制和仿真模块的实现.......................-27-4.1TD-SCDMA系统编码与复用........................................................-27-4.1.1循环冗余校验.......................................................................-27-4.1.2传输块的级联和码块分割...................................................-29-4.1.3信道编码...............................................................................-29-4.1.4交织.......................................................................................-30-4.2TD-SCDMA系统扩频与调制..................................................