基于MIMO的通信系统仿真与分析研究

编号：审定成绩：重庆邮电大学毕业设计（论文）设计（论文）题目：基于MIMO的通信系统仿真与分析研究学院名称：通信与信息工程学院学生姓名：王维甲专业：通信工程班级：0111011班学号：2010213416指导教师：余艳英答辩组负责人：邹虹填表时间：2014年6月重庆邮电大学教务处制重庆邮电大学本科毕业设计（论文）-I-摘要随着移动通信的快速发展，用户数量与用户需求的急剧攀升，使得移动通信成为了通信界最具有市场潜力的技术。而无线通信与有线通信比较时暴露出来的弱点，如移动信道环境恶劣、用户使用突发性大等，使得提高无线通信的容量和质量需要诸多突破点。所以短缺的频谱资源刺激着人们向提高频谱利用率的方向努力。自二十世纪九十年代MIMO（Multiple-InputMultiple-Output，多输入多输出）技术提出以来，由于在提高信道容量方面取得的突出成果，逐渐被无线通信领域的多个标准所应用，成为了在提供可靠无线传输链路方面一个重要突破。MIMO技术是由多天线分集技术和空间编码技术相结合而产生的，它的一个很重要的特点就是：不再是对抗多径效应，而是巧妙地利用它。随着研究人员对MIMO通信系统理论、算法、应用等各个方面越来越多的研究，其已经成为了通信技术中的热门课题。本文首先介绍了MIMO技术的基本原理和MIMO通信系统的信道模型，然后简要介绍了本文研究使用的仿真工具，即MATLAB/Simulink仿真软件。其后通过理论推导与软件仿真对MIMO通信系统的信道容量进行了研究，总结了各因素对信道容量的影响。最后本文对基于正交空时分组编码的MIMO通信系统进行了仿真。【关键词】频谱利用率MIMO通信系统信道容量正交空时分组编码重庆邮电大学本科毕业设计（论文）-II-ABSTRACTWiththerapiddevelopmentofthemobilecommunications,thesharpriseinthenumberofusersandtheneedofusersmakingthemobilecommunicationshasbecometothemostpotentialtechnologyinthecommunicationmarket.However,whencomparedthewirelesscommunicationstothewiredcommunications,theweaknessesunfolded.Suchasthepoormobilechannelenvironment,thesuddenriseordownofthenumberofusersorothercharacteristics,makestheimprovementofthecapacityandthequalityofwirelesscommunicationneedsmanybreakthroughs.Buttheshortageofspectrumresourcesstimulatespeopletoimprovethespectrumutilization.Sincethe1990s,MIMO(Multiple-InputMultiple-Output)technologyhasbeengraduallyappliedtoseveralstandardsofwirelesscommunicationsandbecomeanimportantbreakthroughinmanyaspects,suchasprovidingreliablewirelesstransmissionlink,fortheoutstandingachievementsinimprovingthechannelcapacity.MIMOtechnologyiscombinedwithmulti-antennadiversitytechnologyandspatialcodingtechnology.OneofthemostimportantfeaturesofMIMOtechnologyisnotconfrontingmultipatheffects,butusingitcleverly.Withmoreandmorestudiesinthetheory,algorithms,applications,etc.ofMIMOcommunicationsystemsbymanyresearchers,ithasbecomeahottopicincommunicationstechnology.Firstly,wewilldescribethebasicprinciplesoftheMIMOsystemtechnologyandtheMIMOchannelmodelsinthispaper.ThenIwilldescribethesimulationtool,MATLAB/Simulinksimulationsoftwarebriefly.Next,thispaperwillstudythetheoreticalderivationandsimulationsoftwareforthechannelcapacityofMIMOsystemsandsumuptheimpactofvariousfactorsonthechannelcapacity.Finally,asimulationoftheMIMOcommunicationsystembasedonorthogonalspace-timeblockcodingwillbegiveninthispaper.【Keywords】SpectrumutilizationMIMOcommunicationsystemChannelcapacityOrthogonalspace-timeblockcoding重庆邮电大学本科毕业设计（论文）-III-目录前言...................................................................................................................................1第一章MIMO技术的概述...............................................................................................3第一节MIMO技术发展历史和现状...........................................................................3一、发展历史................................................................................................................3二、现状........................................................................................................................3第二节仍存在的问题与发展趋势...............................................................................4一、仍存在的问题........................................................................................................4二、发展趋势................................................................................................................5第三节MIMO技术原理...............................................................................................5一、天线分集技术........................................................................................................5二、空时编码技术........................................................................................................7第四节MIMO通信系统模型.......................................................................................8第五节MIMO通信系统信道模型.............................................................................10第六节本章小结.........................................................................................................12第二章MATLAB/Simulink仿真工具介绍...................................................................13第一节概述.................................................................................................................13第二节通信系统仿真方法与流程.............................................................................13第三节Simulink仿真概述..........................................................................................14第四节Simulink通信工具箱仿真模块与S-函数.....................................................15一、通信工具箱..........................................................................................................15二、S-函数..................................................................................................................16第五节本章小结.........................................................................................................16第三章MIMO信道容量仿真与分析研究.....................................................................17第一节信道容量计算概述.........................................