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