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1、哈尔滨工业大学工学博士学位论文AbstractDuetothehighdatarate,robustnesstomultipathfading,lowpowerconsumption,high-precisionlocalization,lowcomplexityandcost,impulseradio-ultrawideband(IR-UWB)isregardedasthemostappropriatephysicallayertechnologyforshortrangewirelesspersonalareanetwork(WPAN).For
2、wirelesscommunicationsystems,inordertomeetcertainperformancerequirements,thereceiverneedstocollectmultipathsignalenergyforimprovingsignal-to-noiseratio(SNR).Whenintersymbolinterference(ISI)causesseriousdeteriorationofsystemperformance,itisalsoneededtoconsiderthesuppressionofIS
3、I.Unlikethetraditionalwirelesscommunicationsystemwithcontinuouscarriermodulation,IR-UWBsystemusesextremelynarrowpulsestocarryinformation.Astheradiowavepropagationcharacteristicsofnon-continuousshortimpulsedifferwiththatofnarrowbandsignal,theultrawideband(UWB)channelisdifferent
4、fromthenarrowbandchannel,whichisembodiedonthecharacteristicsofdensemultipath,frequencydependenceandenvironmentdependence.ThesefactorsbringmoredifficultiesforIR-UWBreceivertorealizemultipathsignalenergycollectionandsuppressionofISI.Weresearchonmultipathsignalenergycollectionand
5、suppressionofISIcombinedwiththecharacteristicofindoorUWBchannel.Ittriesbesttotakeadvantagesofthereceivedimpulsesignalfeaturestoresolveeffectivelythetwoproblems.Thecontentsofthisthesisarelistedasfollowing:I.TheeffectofUWBindoorchannelcharacteristicsonreceiverperformance.Itistwo
6、importantproblemsforsystemperformancetocollectmultipathsignalenergyandsuppressISI,toobtainacertainperformance,thetwoproblemsshouldbeconsidered,bothofthemisrelatedwithchannel.Differentfromthetraditionalnarrowbandchannel,UWBchannelpossessesthecharacteristicsofdensemultipath,freq
7、uencydependenceandenvironmentdependence.Atfirst,weanalyzetheeffectsofdensemultipath,frequencydependenceandenvironmentdependenceonmultipathsignalenergyandsuppressionofISI.Combinedwithcurrentmethodsforthetwoproblems,thedrawbacksofcurrentmethodsarepointedout.Then,theUWBindoorchan
8、nelmodelisintroduced,whichprovidesthefoundationforfollowingin
