多速率信号处理的设计与实现Design and implementation of multirate signal processingWord文件下载.docx
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ExperimentalgardenforCollegeStudents
Three
Designandimplementationofmultiratesignalprocessing
ChenYiou,LiGuangjun
UniversityofElectronicScienceandtechnologyofChina,Chengdu,610054
Thirty-three
Abstract:
themultiratesignalprocessingisthebasictheoryofsoftwareradio,thispaperintroducesanefficientprocessingmethodofmultiratesignal,whichusesCICfilterandHBfilter,FIRfilterandpolyphasefiltersfordecimationandinterpolationinordertoachievethepurposeofchangingthesignalrate.Thispaperintroducesthebasicprincipleofvariousfilters,analyzestheproblemsneedingattentioninthedesignandimplementation,andgivesthedesignresultsofdigitaldownconversionwiththismultiratesignalprocessingmethod.Keywords:
multiratesignalprocessing;
CICfilter;
HBfilter;
decimation;
interpolation;
polyphasefilteringinthegraphclassificationnumber:
TN92documentidentificationcode:
Aarticlenumber:
1672-4550(2006)06-0113-04
DesignandReaLizationofMulti-RateSignaLProcessign
(UniversityofElectronicScienceandTechnologyofChinaChengduAbstract:
Multi610054)-Ratesignalprocessingisabasictheoryinsoftwareradio.Thispaperintroducesamethodofmulti-ratesignalprocessingwhichusesCICfilters,HBfilters,FIfiltersandpolyphasefil2Rofusingthistechniquetodesignadigitaldownconvertertersreachthegoal.Toofdecimationandinterpolation,inordertochangetherateofdigitalsignalsItin2troducesthestructuresofthe.Typicalfilters,analyzessomerelevantissues,andbringsforwardtheresultKeywords:
multi-ratesignalprocessing;
CIfilter;
HBfilterdeci;
ate;
interpolate;
polyphaseCmCHENYi2,LIGuang2junou
CIC
1Introduction
Makespectrumworse.Therefore,theessenceofmultiratesignalprocessingistocooperatewithseveraltypicalfiltersthroughdecimationandinterpolationintimedomainsoastoachievethepurposeofsignalrateconversion.Atypicalmultiratesignalprocessingarchitectureisshowninfigure1.Filtern.
HBextraction
Multiratesignalprocessingisthebasictheoryofsoftwareradiosystem,itthroughtheinterpolationandextractionrateofchangeofthedigitalsignalinsoftwareradiosystemtoadapttothedifferentmodulesofthesignaltothedifferentratesof[1-2],isanimportanttechnologyfordigitaldownconversionanddigitalfrequency.Inpracticalengineering,inordertochangetherateofdigitalsignalsandavoidsignalfrequencyaliasing,usuallyadoptthefollowingfilter:
CICdecimationfilter,HBfilter2timesextractionorwithinthemultiphasestructureofFfilterandIRfilter.
Wavefilter
Filtern.
FIR
Polyphasefilterbank
HBinterpolation
Fig.1atypicalmultiratesignalprocessingarchitecture
Algorithmandimplementationofmorethan2ratesignalprocessing
BecausetheCICfilterissimpleinstructureandhighinfrequency,itisusedinthefirststageofhighspeeddigitalsignalprocessing.Afteritsintegermultipledecimation,
Therateofhigh-speedsignalsisgreatlyreduced.HBdecimationfiltercomputationthanthegeneralFIRfiltersmallhalf,processingrateishigher,butbecauseeachfiltersectiononly2timestheextraction,sousingHBfiltersNcascadeofsignals
Thebasisofmultiratesignalprocessingisdecimationandinterpolation,whichcanbedirectlyextractedandinterpolatedintimedomain,whichleadstotheexpansionandcompressionofthefrequencydomain,
[ePub]2006-08-02
[author]ChenYiou(1982-),female,graduatestudent,themainresearchdirectionisdigitalsignalprocessingandASICdesign.
-113-
December2006ExperimentScience&
TechnologySixth
2timesdecimation.SincetheCICfilterandtheHBfilterareallaliasingfilters,thesignalneedstobefilteredbytheFIRfiltertoeliminatetheunwantedfrequencycomponents,andthenthenextstepistobeprocessed.Thepolyphasefilterbankscanconvertthefractionalsamplingrate,maketherateconversionmoreflexible,andalsomaketheoutputspeedofthewholesystemmeettheneedsofspecialapplications.Afterthepolyphasefilterbank,thecascadedHBinterpolationfiltercanalsobeusedtoimprovethetimeresolutionoftheoutputsignal.Next,thealgorithmofeachfilterandtheproblemstobenoticedinthedesignandimplementationareintroducedindetail.211integralcombfilter(CICfilter