MIMO-OFDM系统空时编码技术的仿真研究解析

毕业设计（论文）MIMO-OFDM系统空时编码技术的仿真研究院别计算机与通信工程学院专业名称通信工程班级学号4090802学生姓名杨虎指导教师黄力群2013年6月6日东北大学秦皇岛分校毕业设计（论文）第I页MIMO-OFDM系统空时编码技术的仿真研究摘要多输入多输出(MIMO)技术作为近年来无线通信传输技术研究中最大的突破之一，其利用多信道传播，可以极大改善无线通信的频谱效率和通信可靠性，越来越成为无线通信领域研究中的热点。OFDM技术是一种能够有效解决由于多径造成符号间干扰问题的传输手段。将OFDM和MIMO这两种技术相结合，就能达到两种效果：一是系统获得很高的传输速率，另一种是通过分集获得更高的可靠性。所以，MIMO信道的建模与仿真是MIMO理论研究中的重要内容。本文详细介绍了MIMO系统理论，对不同发射和接收天线下，MIMO的系统容量进行仿真分析。从仿真结果中看出增加发射和接收天线的数目均能提高系统容量。同时也详细介绍了OFDM系统的基本原理及优缺点，空时信道的模型，空时编码的系统结构和编码方法，给出了空时编码与MIMO-OFDM相结合的系统框图。最后主要介绍空时编码技术与MIMO-OFDM系统的结合，从理论上对其性能进行分析，并进行仿真分析。分析结果表明STBC-OFDM-MIMO系统具有相对简单的编译码算法和较好的性能、有效地对抗多径衰落以及更高的传输速率和频谱效率。关键词：MIMO-OFDM，信道容量，空时编码，STBC-OFDM-MIMO东北大学秦皇岛分校毕业设计（论文）第II页SimulationofMIMO-OFDMSystemwithSpace-timeCodingTechnologyAuthor：YangHuTutor：HuangLiqunAbstractMultiple-inputmultiple-output(MIMO)wirelesscommunicationtransmissiontechnologyinrecentyearsasthebiggestbreakthroughinthetechnology,oneoftheuseofmulti-channeltransmission,cangreatlyimprovethespectrumefficiencyofwirelesscommunicationandcommunicationreliability,thewirelesscommunicationfieldincreasinglyresearchhotspot.OFDMtechnologyisaneffectivesolutiontothemultipathproblemofintersymbolinterferencecausedbythetransmissionmeans.BoththeOFDMandMIMOtechnology,canachievetwoeffects:onesystemtoobtainahightransmissionrate,theotheroneisobtainedbydiversityhigherreliability.Therefore,MIMOchannelmodelingandsimulationofMIMOtheoreticalstudiesareimportant.ThispaperdescribestheMIMOsystemtheory,underdifferenttransmitandreceiveantennas,MIMOsystemcapacitysimulationanalysis.Seenfromthesimulationresultstoincreasethenumberoftransmitandreceiveantennascanimprovethesystemcapacity.AlsodescribedindetailthebasicprinciplesofOFDMsystemadvantagesanddisadvantages,space-timechannelmodel,space-timecodingsystemstructureandencodingmethod,givesthespace-timecodingandMIMO-OFDMsystemblockdiagramcombined.Finallyintroducesspace-timecodingtechniquesandthecombinationofMIMO-OFDMsystem,itsperformanceistheoreticallyanalyzed,andsimulationanalysis.TheresultsshowthatSTBC-OFDM-MIMOsystemhasarelativelysimpleencodinganddecodingalgorithmsandbetterperformance,effectiveagainstmultipathfadingandhighertransmissionratesandspectrumefficiency.KeyWords:MIMO-OFDM，ChannelCapacity，Space-timeCoding，STBC-OFDM-MIMO东北大学秦皇岛分校毕业设计（论文）第III页目录1绪论............................................................................................................................11.1课题的研究意义....................................................................................................11.1.1MIMO技术简介...........................................................................................11.1.2信道建模的必要性.......................................................................................21.2选题意义和研究内容............................................................................................31.3本文的结构............................................................................................................42MIMO系统的容量分析............................................................................................52.1MIMO系统模型....................................................................................................52.2MIMO系统容量分析............................................................................................72.3发送端信道容量的比较......................................................................................103MIMO-OFDM原理.................................................................................................113.1OFDM技术基础..................................................................................................113.2OFDM的基本原理..............................................................................................123.3OFDM的关键技术..............................................................................................143.3.1保护间隔和循环前缀.................................................................................143.3.2信道估计技术.............................................................................................143.3.3同步技术.....................................................................................................143.3.4信道编码和交织技术.................................................................................143.4OFDM的优缺点..................................................................................................153.5MIMO-OFDM系统结构.....................................................................................164发射分集与空时编码技术......................................................................................184.1发射分集技术......................................................................................................184.1.1分集种类.....................................................................................................194.1.2分集合并方法.............................................................................................194.1.3发射分集.....................................................................................................204.2空时编码技术...................................................