放大转发协同通信系统误码率性能的仿真实现

1放大转发协同通信系统误码率性能的仿真实现作者姓名徐继浩专业通信工程指导教师姓名林霏专业技术职务讲师山东轻工业学院2010届本科生毕业设计（论文）1目录摘要.......................................................................................................1ABSTRACT...................................................................................................2第一章绪论....................................................................................31.1本课题的意义...........................................................................................31.2本课题的主要内容..................................................................................4第二章协同通信的简介................................................................42.1协同通信的研究背景...............................................................................42.2协同通信的概念.......................................................................................52.3协同通信分类...........................................................................................62.3.1解码转发方式.......................................................................................62.3.2放大转发方式.......................................................................................72.3.3编码协作方式.......................................................................................72.3.4空时编码协作方式...............................................................................72.4最新研究进展与展望...............................................................................8第三章放大转发的性能分析........................................................83.1基本原理..................................................................................................8山东轻工业学院2010届本科生毕业设计（论文）23.2性能分析..................................................................................................83.2.1信道模型...............................................................................................93.2.2瞬时接收信噪比的计算......................................................................103.2.3误码率性能分析..................................................................................11第四章误码率性能的仿真..........................................................124.1MATLAB的主要语法和操作符...............................................................124.2MATLAB操作的注意事项.......................................................................144.3仿真框图................................................................................................144.4基于MATLAB的蒙特卡罗仿真..............................................................15第五章总结..................................................................................19致谢.....................................................................................................21参考文献.................................................................................................22附录.....................................................................................................23山东轻工业学院2010届本科生毕业设计（论文）1摘要无线信道具有的多径衰落特性是阻碍信道容量增加和服务质量改善的主要原因之一，分集技术可以在发射端发射多个信号样本，在接收端合并多个经历独立衰落的信号样本，以对抗无线信道中的衰落。为了提高移动通信系统的性能，通常需要在发射端进行分集。而移动通信中的发射分集一般需要在发射端使用多根天线，但许多无线设备因受尺寸或硬件复杂度的限制，一般只有单根天线。为此，专家提出了一种新的解决方法——协同通信。协同通信利用无线网络中的其它移动台作为中继，构成虚拟的多输入多输出(MIMO)天线系统，为MIMO技术的实用化提供了一种有效途径。误码率（symbol-error-rate,SER）是衡量无线通信系统可靠性的主要性能指标。本文分析了一个两用户放大转发协同通信系统的误码率SER性能，得到了QPSK全称调制下SER的理论表达式；然后，通过蒙特卡罗方法对一个两用户放大转发协同通信系统的误码率进行了仿真，与理论值完全吻合，以此验证了理论分析；并且优于直传非中继系统的误码率性能，这说明协同通信系统的确可以对抗衰落，提升无线通信系统的性能。关键词：协同通信误码率再加个关键词吧，两个少点山东轻工业学院2010届本科生毕业设计（论文）2ABSTRACT且不说句子的语法结构如何，光word提示的错误单词有多少啊，认真点Wirelesschannelwithmultipathfadingcharacteristicsisoneofthemainreasonsthatobstructtheincreasementofchannelcapacityandimprovementofservicequality.Inordertocounterthefadingofwirlesschannel,diversitytechnologycansendmultiplesignalsatthetransmitter,andthereceivercombinemultipleindependentfadingsignals.Inordertoimprovetheperformanceofmobilecommunicationsystem,diversityshouldgenerallybeprovidedatthetransmitter.Transmitdiversitygenerallyrequiresmorethanoneantennaatthetransmitter.However,manywirelessdevicesarelimitedbysizeorhardwarecomplexitytooneantenna.Inordertoovercomethisdisadvantage,anewclassofmethodscalledcooperativecommunicationhasbeenproposedbytheexperts.CooperativecommunicationadoptsthemobilestationofotherusersasrelaytoformvirtualMultiple-inputMultiple-output(MIMO)antennasystem,whichhasprovidedanewwayforthepracticalMIMOsystem.thesymbol-error-rate(SER)performanceisanimportantfactorforthereliabilityofwirelesscommunicationsystem.TheSERperformanceisanalyzedforatwo-useramplify-and-forwardcooperativecommunicationsystem.AndthetheoreticalSERformulationwithqpsksignalsisderived;ThentheSERperformanceissimulatedbyMonteCarlomethodandtheresultsverifytheoreticalanalysis.What’smore,itheSERperformanceofthecooperativecommunicationsystemisbettertotheforwardpassandnon-relaysystem,ithasprovedthatthecooperativecommunicationsystemcanindeedconfrontdecadenceandimprovetheperformanceofthewirelesscommunicationsystem.Keywords：Cooperativecommunication;SER山东轻工业学院2010届本科生毕业设计（论文）3第一章绪论1.1本课题的意义无线通信发展至今，人们对于传输的数据速率和服务质量的要求不断提高，寻求进一步扩大信道容量、改善通信质量的新技术是国内外学术界、产业界普遍关注的问题。衰落是影响通信质量的主要因素，