超宽带无线通信ppt课件.pptx

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1、UWBtechnology姓名：学号：Contents1.WhatistheUWB2.UWBtechnologytheory3.UWBmaincharacteristics4.UWBapplicationfield5.UWBdevelopmentprospects一、WhatisaUWBUWB(Ultra-Wideband)technologyisalsocalled“superbroadband”,sayagainImpulseRadiotechnology.Ultrabroadbandandother“narr

2、owband”or“broadband”therearetwomajoraspectsofthedifference：1、UWBbandwidth,accordingtothefederalcommunicationscommission(FCC)definitionofmorethan1.5GHzsignalbandwidth,orthesignalbandwidthandcenterfrequencythanmorethan25%forUWB;Thesignalbandwidthandcenterfrequen

3、cyratioisbetween1%~25%forbroadband,lessthan1%fornarrowband,visibleUWBbandwidthsignificantlygreaterthanatpresentallcommunicationtechnologyofbandwidth.2、theUWBnocarrieroftransmission.Thetraditional"narrowband"and"broadband"areusingradiofrequency(RF)carrierforsig

4、nals,carrierfrequencyandpowerinacertainrangechange,anduseofthecarriertotransmitinformationstatechanges.Onthecontrary,UWBusingbasebandtransmission.AccordingtotheprovisionsoftheFCC,from3.1GHzto10.6GHzofbetween7.5GHzbandwidthfrequencyforUWBUSESfrequencyrange.SUWB

5、TRANSMITTERDUWBRECEIVERWirelesschannelantennaantennaUWBcommunicationsystemmodel二、UWBtechnologytheoryPulsegeneratorPulsemodulemodulationCommunicationchannelLownoiseamplifierMatchedfilter/RelatedreceiverRelatedreceiverSourcecodingChannelcodingmodulationDigitalfi

6、lterDACtransmitterADCDigitalsignalprocessingLownoiseamplifierVariablegainamplifierreceiverThelaunchwillbebitsymbolsforpulseshapingthroughdigitalfilter,andthenconvertedintoanalogsignalsemitted;Receivingsignalsinturnthroughthelownoiseamplifier(LAN),variablegaina

7、mplifier(VGA)andADCbecomediscretesignalafter,thenavailableDSPtechnologyrealizesignaldetection,estimated,diversity,judgmentdecodeprocessreceiving.Atpresentthemethodofproduceimpulsesourcesareoftwotypes:(1)thephotoelectricmethod(2)electronicmethodUWBmodulationtec

8、hnique:(1)pulseamplitudemodulation(PAM)(2)pulsepositionmodulation(PPM)UWBtechnologytotheresearchmainlyaroundthefollowingseveralaspects:(1)controllablenarrowpulsetechnology(2)channe