基于Matlab的IR-UWB无线通信信道模型仿真

摘要超宽带通信技术是一种全新的短距离无线通信技术。它利用极窄脉冲传输数据，具有传输速率高、功耗低、抗多径能力强等许多优点，并且由于频谱的功率谱密度极小，它通常具有扩频通信的特点。该技术以其独有的特性正受到通信学术界和产业界乃至军方的重视，并将取得进一步的发展，获得日益广泛的应用。本文首先概括地介绍了超宽带无线通信的基础知识，重点研究TH-UWB信号特点及传播特性，对比超宽带信道模型与窄带无线信道的不同，在此基础上分析路径损耗模型和多径衰落模型对PPM-TH-UWB超宽带信号传输的影响。利用MATLAB仿真分析了PPM-TH-UWB和PAM-TH-UWB信号时域表达式及其功率谱密度（PSD），同时对修改的S-V室内信道模型进行建模，在此基础上仿真分析了脉冲超宽带信号在此信道模型下的传输特性，分析模型参数对信号传输的影响。关键词：超宽带；脉幅脉位调制；功率谱密度；平均功率时延；均方根时延AbstractUltra-widebandcommunicationtechnologyisanewshort-rangewirelesscommunicationtechnology.Itwasusedbyverynarrowpulsestotransmitdatawithahightransferrate,lowpowerconsumption,anti-multipathcapabilityandmanyotheradvantages，andbecauseofthespectrumofpowerspectraldensityisextremelysmall,itusuallyhasthecharacteristicsofspreadspectrumcommunication.Thetechnologywithitsuniquefeaturesispayingmoreattentionbythecommunicationsandtheacademic,eventhemilitary.Anditwillmakemoredevelopment,accesstoanincreasinglywiderangeofapplications.Thepaperfirstbrieflyintroducedthebasicknowledgeofultra-widebandwirelesscommunications,whichfocusesontheTH-UWBsignalpropagationcharacteristicsandcomparedthedifferentofultra-widebandchannelmodelwithnarrow-bandradiochannel,basedonthisanalysisofpathlossmodelandthemultipathfadingmodelPPM-TH-UWBUltra-WidebandSignalTransmission.WithusingMATLABsimulatedanalysistheuseofPPM-TH-UWBandPAM-TH-UWBsignalthetime-domainexpressionandthepowerspectraldensity(PSD),atthesametimeonthemodifiedS-Vchannelmodelforindoormodeling.OnthebasisofsimulatedanalysisofthepulsesignalofUWBchannelmodelintransmissioncharacteristics,ontheimpactofsignaltransmissionundertheanalysisofmodelparameters.Keywords:Ultra-Wideband;PPMpulserate;Powerspectraldensity;Averagepowerdelay;RMSDelayI摘要..............................................................IAbstract............................................................I第1章绪论.........................................................11.1UWB通信技术背景和发展现状..................................11.2UWB的技术特点..............................................31.3UWB与其它短距离无线技术的比较..............................41.4UWB的应用前景..............................................51.5论文内容及结构..............................................6第2章超宽带通信信道模型...........................................72.1无线信道特性................................................72.1.1大尺度衰落...........................................72.1.2小尺度衰落...........................................72.1.3多径效应...............................................82.2超宽带室内信道模型..........................................92.2.1室内信道模型..........................................92.2.2室内信道特征参数.....................................122.2.3IEEE802.15.3a标准信道模型...........................152.3本章小结...................................................19第3章IR-UWB信号的发射和接收.....................................203.1UWB无线电通信的基本原理...................................203.2IR-UWB脉冲................................................213.3信号调制技术...............................................233.3.1单脉冲调制...........................................233.3.2多脉冲调制...........................................243.4超宽带系统发送信号.........................................243.4.1基本信号.............................................243.4.2调制信号.............................................24II3.4.3发送信号.............................................253.5多径信道PPM-TH-UWB接收机..................................273.5.1连续时间信道冲激响应.................................273.5.2离散时间信道冲激响应.................................273.5.3TH-PPM-UWB接收机....................................283.6本章小结...................................................29第4章IR-UWB无线通信信道仿真.....................................304.1发射端信号的仿真...........................................304.1.1二进制TH-UWB信号....................................304.1.2二进制TH-UWB信号的PSD分析.........................324.1.3其他典型IR-UWB信号及其功率谱密度仿真...............364.2IEEE802.15.3a标准信道模型.................................494.3PPM-TH-UWB信号通过不同信道环境的仿真分析..................574.3.1高斯噪声环境的信号传输...............................584.3.2IEEE802.15.3a信道环境下的信号传输...................604.4本章小结.......................................................63结论...............................................................64致谢.............................................................66参考文献...........................................................67摘要..............................................................IAbstract............................................................IChapterOneIntroduction............................................11.1UWBcommunicationstechnologybackgroundandcurrentsituation....11.2TechnicalcharacteristicsofUWB................................31.3UWBandotherrelativelyshort-rangewirelesstechnology............41.4UWBapplicationprospects.....................................5III1.5Contentandstructureofpaper...................................6ChapterTwoUWBchannelmodel.......................................72.1Channelcharacteristics.........................................72.1.1Largescalefading......................................72.1.2Smallscalefading.....