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1、基于Verilog的数字下变频实现摘要在软件无线电接收机的设计中，如果经过混频后得到的中频信号比原始信号的频率低，那么此种混频方式叫做下变频（DownConverterorDC）。数字下变频的目的是经过数字混频将A/D转换输出的中频信号搬移到基带，然后再通过抽取，完成信道提取任务。数字下变频（DigitalDownConverterorDDC）是软件无线电的核心技术之一。关键词：数字下变频;抽取;FPGA;VerilogHDLAbstractInsoftwareradioreceiverdesign,theinterm
2、ediatefrequencysignallowthantheoriginalfrequencysignalafterfrequencymixing,thisfrequencymixingwayDownunderConverteralwayscalledDC.ThepurposeoftheDDCismovedintermediatefrequencysignalwhichistheoutputofADCconversiontothebasebandbydigitalfrequencymixing,thenextract
3、ingandcompletingthechannelextractiontask.DDCisthemaintechnologyofsoftwareradio.Keywords:DDC;Decimation;FPGA;VerilogHDLtheirownconditionstodevelopthecorrectroad,themaximumtoavoidinvestmentrisk,gainprofit.(three)vigorouslypromotethebrand.Toestablishbrandawareness,
4、awarenessoftheuseofbrand,brandvalue,brandacquisitionperformance,enhancethecompetitivestrength.Concentratedmanpower,carefulplanning,packagingandpublicityofanumberofunique,marketinfluenceandcoverageofthebrand,theimplementationofkeybreakthroughs,toenhancethecompeti
5、tivestrength,walkingbusinessroadthecompetitionofalienationandcharacteristics,thepursuitofstabilityanddevelopmentofthemarket.(four)topromotetheintegrationofresources.Tofurtherbroadentheirhorizons,effectiveintegrationofresourceswithinthegroup,thecityresources,othe
6、rindustriesandregionalresources,mutualtrust,mutualbenefit,seekingwin-winprinciple,intheframeworkofnationalpoliciesandregulations,strictinspectionandargumentation,legalconsultation,examinationandapprovalprocedures,strictregulationofeconomicactivities,attractinjec
7、tionthesocialinvestmenttotheindustrygroup,toachieveleveragingthedevelopment,ensurethatthevalueofstate-ownedassets.(five)tostrengthentheconstructionmanagementpersonnel.Strengthenthemanagementofeducationandtrainingofcadresandworkersoftheexistingbusiness,firmlyesta
8、blishtheconceptofthemarket,enhancethesenseofcrisistoadapttomarketcompetition,thesenseofurgency,improvetheabilitytorespondtomarketcompetition,improvemanagementandopera
