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1、摘要MIMO技术是无线通信技术发展的一次重大飞跃，它能够突破无线频率资源限制，大幅度提高无线通信系统效率，被认为是无线通信技术未来发展的方向。然而，MIMO技术也彻底打破传统的无线通信模式，它要求系统使用多根发射和接收天线同时地发射和接收数据，使得无线通信系统结构、分析方法、调制、编码、信道估计、检测和多址方式等各个方面面临挑战。本文在国内外相关研究工作的基础上，针对MIMO信道容量理论进行深入研究。首先介绍了MIMO的研究现状，包括已取得的进展和存在的问题。并在移动无线信道特点的基础上，阐述了
2、MIMO信道的特征，建立了数学模型。然后，仿真了数种典型恒定信道参数系统的容量以及空间相关性对信道容量的影响，进而得出结论：MIMO系统可以有效的提高信道容量,但是由于天线之间相关性的影响，MIMO系统容量也有所下降。其次，分析了STBC系统的容量，并将其与全开环MIMO系统的容量进行了比较。最后重点实现了OFDM技术的仿真，并讨论了MIMO-OFDM系统在频率选择性信道下的容量以及多径和空间相关对其系统容量的影响。关键词：多输入多输出信道容量空间相关性空时分组码正交频分复用AbstractMu
3、ltiple-input-multiple-output(MIMO)technologyisasignificantbreakthroughinthedevelopmentofwirelesscommunicationtechnologies.Itcangetridoftheconstraintofradiofrequencyresourceandgreatlyincreasethespectralefficiencyofwirelesssystems,andthusisconsideredas
4、thefuturedevelopmenttrendofwirelesscommunicationtechnologies.However,MIMOtechnologythoroughlybreaksthemodeoftraditionalwirelesscommunications,sinceitrequiresmultipletransmitandreceiveantennastosimultaneouslytransmitandreceivedatainformationinthesamet
5、ime,whichchallengesalltheaspectsofwirelesscommunicationsincludingsystemarchitecture,analyticalmethods,modulation,coding,detection,channelestimation,multipleaccess,andsoon.Onthebasiscurrentresearchworks,thispaperinvestigatesMIMOchannelcapacity.Firstly
6、,theauthorintroducesthecurrentstudyofMIMO,includetheinprovementswhichwerereceivedandthechallengeswhicharefaceingto.Then,itanalysesthewirelesschannels,andexpoundstheMIMOchannelcharacteristic,andmodelstheMIMOchannel.Secondly,itsimulatesthecapacityofsev
7、eraltypicalinvariablenessparameterchannelsandtheimpactofchannelspacecorrelationonthecapacityofMIMOsystem.Fromthesimulation,wecantaketheconclusionthatMIMOsystemcaneffictivelyimprovethannelisdecreased.Thirdly,itanalyzesthecapacityofSTBCsystem,thencompa
8、risesthecapacityofMIMOsystemandSTBC.Finally,itissimulatedtheOrthogonalFrequencyDivisionMultiplexing(OFDM),anddiscussedthatthecapacityofMIMO-OFDMsystemoverfrequencyselectivefadingchannels,thensimulatedtheimpecapacityofchannel,butduetotheimpactofchanne
