基于gnu+radio和rtlsdr软件无线电的fm广播解调接收

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1、万方数据二委士学位论文MASTER’STIIESISAbstractNowadays，thewirelesscommtmicationsystemdevelopstowardsmulti—standardandmulti—system，buttheconventionalradiosystemsaretoohighlydependentonhardwaretoadapttothedevelopmentofcommunicationsystemneeds．Inordertosolvetheabovepro

2、blems，conventionalradiosystemdevelopstowardsoftwaredefinedradiostepbystep．Sottwaredefinedradioproposedaconceptofrealizingradioapplicationsinastandardized，modular,general-purpose，openandexpandableway，ithastheadvantagesofsoftware-programmable，expandable，ea

3、sytomodifyandlow-cost，throughcombiningastandardized，modularhardwareplatformwiththesignalprocessingsottwaresuchasGNURadio，itupgradesthecommunicationtechnologyfromthetraditionalfixedcircuitsandhardware-dependentlimitationstosoftwareandexpandableinheight．In

4、thethesis，theconcept,developmentandapplicationofso．aredefinedradioWasintroduced，furtherdiscussedthebasicstructureandkeytechnologiesofsoftwaredefinedradioWasanalyzed，thenadetailedintroductiononthestructureandworkingprincipleofthesoftwareGNURadioandhardwar

5、eRTLSDRWasdiscussedrespectively．LastaFMbroadcastdemodulationbasedonGNURadioandRTLSDRWasdesignedbycreatingsignalprocessingflowdiagram．ThisthesisfocusesontheresearchanddesignofFMbroadcastsignal’SdemodulationandreceivingwhichbasedonGNURadioandRTLSDRsoftware

6、definedradioplatform．ThedesignWasbasedontheideaofsoRwaredefmedradio，whichusedthetunerR820TofRTLSDRtoreceivetheradiosignalandconverteditdowntolowintermediatefrequencythroughtwicedown-converting，thelowintermediatefrequencysignalWasconvertedfromanalogtodigi

7、talandfu／'therconvertedtoquadratebasebandIQsignalintheRTL2832UchipofRTLSDR．ThebasebandIQsignalisfedintothecomputersignalprocessingsoftwareplatformGNURadiotobedemodulated，filtered，amplifiedInGNURadio，thesignalWasdemodulated，filteredandamplifiedbycreatings

8、ignalprocessingflowchartintheGraphicalUserInterfaceGNURadio—Companion．TheimportantworkinthedesignisthedemodulationoftheFMbroadcastinGNURadio，whichWasdoneinGNURadio—Companionbycreatingsignalprocessingflowdiagram．Inthethesis