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1、摘要雖然第三代移動通信技術(shù)還沒有應(yīng)用到實(shí)際生活之中，但是新一代無線通信技術(shù)已撲面而來，其無所不在、高質(zhì)量、高速率的移動多媒體傳輸目標(biāo)讓人耳目一新。然而，實(shí)現(xiàn)這一振奮人心的通信目標(biāo)并非易事，常規(guī)單天線收發(fā)通信系統(tǒng)面臨嚴(yán)峻挑戰(zhàn)，采用常規(guī)分集技術(shù)或智能天線技術(shù)己不足以解決新一代無線通信系統(tǒng)的大容量與高可靠性需求問題。此時(shí)，多天線的無線通信技術(shù)為我們提供了解決該問題的新途徑，它在無線鏈路兩端均采用多天線，能夠充分開發(fā)空間資源，在無需增加頻譜資源和發(fā)射功率的情況下，成倍地提升通信系統(tǒng)的容量與可靠性。本文首先介紹了MIMO通信技
2、術(shù)的相關(guān)背景及其信道模型；然后引入了空時(shí)編碼的介紹，同時(shí)對基于垂直分層編碼的四種檢測算法進(jìn)行了性能比較，分析在不同天線配置下算法的可靠性。關(guān)鍵詞：MIMO，信道容量，垂直分層編碼，檢測算法AbstractThethirdgenerationmobilecommunication(3G)technologiesarcstillnotappliedintoourlife．However,thenewgenerationwirelesscommunicationtechnologiesareemergingandboomi
3、ng,whosetargetofprovidingubiquitous，highquality,andhighdataratemobilemultimediatransmissionsoundsmuchattractive．Ofcourse,theimplementationofthisunprecedentedtargetisnotsoeasy,andthetraditionalcommunicationsystemsusingsingle-antennatransmittingandreceivingarecon
4、frontedwithastiffchallengetoachievethistarget．Thedemandsofbothhighcapacityandhighreliabilityinthenewgenerationwirelesscommunicationsystemsarenotenoughtobemeteventhoughoneofthetraditionalimprovedmeasures，suchasthetraditionaltransmitdiversity,receivediversityands
5、martantennatechnology,isused．Fortunately,thecreativetechnology,namelyMultiple-InputMultiple-Output(MIMO)，hasprovidedanovelsolutiontothisproblem．MIMOmethodsmakeuseofmultiple—antennaatboththetransmitandthereceivesideoftheradiolinktomultiplythecapacityandreliabili
6、tyovermoletraditionalwirelesscommunicationsystemsbyfullyexploringthespaceresourcewithinthesamefrequencybandatnoadditionalpowerexpenditure．However,manymoreproblemsareemergingandurgentlywantedtobesolvedinMIMOcommunicationsystemsduetointroducingthemultiple—antenna
7、comparingwiththetraditionalsingle-antennasystems.Inthispaper,theMIMOsystemmodelandknowledgerelatedwasintroduced.firstly．WeanalyzedthecapacityofMIMOchannelindifferentcases．ThentheSpace-TimeCodingwasintroduced，simultaneitywecomparedwiththeperformanceoffourdetecti
8、ngarithmeticandanalyzedthereliabilityofsystemindifferentantennastation．Keyword：MIMOCapacityV-BLASTDetectionAlgorithms第一章緒論無線MIMO技術(shù)被認(rèn)為是實(shí)現(xiàn)未來高速寬帶無線Intemet接入網(wǎng)的關(guān)鍵技術(shù)之一，在第三代(3G)乃至三
