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1、本科畢業(yè)設(shè)計(20屆)瑞利衰落信道的MATLAB仿真摘要在無線通信信道環(huán)境中,電磁波經(jīng)過反射折射散射等多條路徑傳播到達接收機后,總信號的強度服從瑞利分布。同時由于接收機的移動及其他原因,信號強度和相位等特性又在起伏變化,故稱為瑞利衰落。信息技術(shù)的快速發(fā)展,使得通信系統(tǒng)在性能不斷提高的同時也變得越來越復(fù)雜。正因為如此,采用傳統(tǒng)技術(shù)對通信系統(tǒng)進行分析和設(shè)計的日子一去不復(fù)返,而由于計算機仿真方法的廉價性、高效性和靈活性,使其成為了通信系統(tǒng)中的主要設(shè)計和分析手段之一。matlab仿真就是是無線通信系統(tǒng)實驗中
2、常用的一種仿真技術(shù)。論文主要講述了瑞利衰落信道的概念以及各種衰落類型分類和它們的各種特性:頻率特性、時域特性、角度特性。同時根據(jù)瑞利衰落的各種特性提出了兩種克服技術(shù)即OFDM技術(shù)和MIMO技術(shù),同樣論文對這兩種技術(shù)的原理進行了具體介紹。論文還闡述了matlab仿真的概念和在各種領(lǐng)域的應(yīng)用。主要敘述了如何用matlab對瑞利衰落信道進行仿真,以及仿真的各項流程,同時對信道的各個模塊代碼如何運行進行了具體解析,最后給出仿真結(jié)果圖。關(guān)鍵詞:瑞利衰落信道;Matlab仿真;無線通信
AbstractInw
3、irelesscommunicationchannelenvironment,electromagneticwavepassesreflectionrefractionscatteringetcmultiplepaths,alwaysarrivereceiverspreadaftertheintensityofthesignaloftheobeyRayleighdistribution.Andbecausethereceivermobileandotherreasons,signalstrength
4、andphasefluctuationcharacteristicsandinsocalledtheRayleighfading.Therapiddevelopmentofinformationtechnology,makesthecommunicationsysteminunceasingenhancementwhileperformanceisalsobecomingmoreandmorecomplicated.Becauseofthis,adoptsthetraditionaltechnolo
5、gyofcommunicationsystemanalysisanddesigndaysgone,andbecausecomputersimulationmethodofcheapsex,efficiencyandflexibility,causedittobecomethemaindesignforcommunicationsystemandanalyticalmeansone.Matlabsimulationexperimentiswirelesscommunicationsystemusedi
6、nasimulationtechnology.ThegraduationdesignmainlyintroducestheconceptofRayleighfadingchannel,andvarioustypesofclassificationandtheirdeclineofvariouscharacteristics:frequencycharacteristics,time-domainfeatures,Anglecharacteristics.Andaccordingtothevariou
7、scharacteristicsofRayleighfadingpresentstwoovercometechnicalnamelyOFDMtechnologyandMIMOtechnology,alsothepapersontheprincipleofthetwotechnologiesareintroduced.Thispaperexpoundstheconceptandthesimulationofmatlabinvariousfieldsofapplications.Mainlydescri
8、beshowtomatlabtoRayleighfadingchannelaresimulated,andthesimulationoftheprocess,andhoweachmodulecodechanneloperation,andfinallygivesthespecificanalyticalsimulationresultdiagram.KeyWords:Rayleighfadingchannel;Matlabsimulation;wirelesscomm