带多普勒频移的瑞利衰落信道中无线通信系统的设计与仿真研究（英文）-豆柴文库

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带多普勒频移的瑞利衰落信道中无线通信系统的设计与仿真研究（英文）
Abstract:
Wirelesscommunicationsystemsplayanimportantroleintoday'sworld.Inthesesystems,thetransmittedsignalisaffectedbyvarioustypesoffading.OneofthemostcommontypesoffadingisRayleighfadingwithDopplershift.Inthispaper,weinvestigatethedesignandsimulationofawirelesscommunicationsysteminthepresenceofRayleighfadingwithDopplershift.
Introduction:
Thewirelesscommunicationsystemconsistsofatransmitter,amedium,andareceiver.Thetransmittedsignalisaffectedbyvarioustypesoffading.Thefadingcanbeduetotheshadowingeffect,multipathpropagation,andDopplershift.Amongthese,RayleighfadingwithDopplershiftisthemostcommontypeoffading.
Inthistypeoffading,thereceivedsignalfluctuatesinamplitudeandphaseduetotherandomphaseofthearrivingsignals.TheDopplershiftisduetothemovementofthetransmitterorreceiverrelativetothemedium.Thisshiftcausesafrequencyshiftinthereceivedsignal.Theseeffectscancauseasignificantlossincommunicationperformance.
DesignandSimulation:
Inthedesignofawirelesscommunicationsystem,itisimportanttoconsidertheeffectsoffading.Thesystemshouldbedesignedtominimizethefadingeffectsandprovidereliablecommunication.Toachievethis,itisimportanttounderstandthecharacteristicsofthefadingandtheeffectsofDopplershift.
Simulationisapowerfultoolforanalyzingtheperformanceofawirelesscommunicationsystem.Inthispaper,weuseasimulationtoinvestigatetheperformanceofawirelesscommunicationsysteminaRayleighfadingenvironmentwithDopplershift.
Thesimulationconsistsofatransmitter,amedium,andareceiver.Thetransmittersendsasignaltothereceiverthroughthemedium.ThemediumismodeledasaRayleighfadingchannelwithDopplershift.Thereceiverreceivesthesignalandprocessesittorecovertheoriginalsignal.
WesimulatethesystemfordifferentvaluesofDopplerfrequencyandanalyzetheperformance.Wemeasurethebiterrorrate(BER)andthesignal-to-noiseratio(SNR)fordifferentvaluesofDopplerfrequency.Wealsocomparethesimulationresultswiththetheoreticalresults.
Results:
ThesimulationresultsshowthattheBERandSNRdegradeastheDopplerfrequencyi