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1、DesignbasedonHDB3encoderofEDAtechnologyandrealizingSummaryHDB3yardisoneoftheimportantcomponentsindigitalbasebandcommunicationsystem,becauseitdoesnothavedirect-flowcompositions,itisstrongtoexaminetheabilitybymistake,haveadvantagessuchasperformanceofclo
2、ckrecovery,etc,recommendthebasebandthatusestotransmitoneoftheyardtypesasITU.HaveintroducedprincipleandmethodofHDB3codeatfirst,hasproposedamethodbasedonHDB3encoderofEDAtechnology,havesimple,withlowcostscircuit,developmentperiodisshort,itishightocarryou
3、tthespeed,upgradecharacteristicssuchasconvenience,etc.ForewordThird-orderhigh-densitybipolarcodeisanimportantserialdatatransmissionencoding,digitalcommunicationisanimportantpartofthesystem.AndthemostcommonNRZcode,compared,HDB3codehasmanyadvantages,suc
4、has:eliminatingtheDCcomponentNRZcodewithclockrecoveryandbetteranti-jammingperformance,makingitmoresuitableforlong-distancechanneltransmission.Atthesametime,HDB3errordetectioncodehasastrongabilitytouseHDB3codewhenthedatatransfersequence,ifasinglebiterr
5、oroccursduringtransmission,thelawofalternatingpolaritywillbedestroyed,sothereceiverHDB3codebasedontheuniquelawcharacteristics,canbedetectedtheerrorandcorrecttheerror,andfacilitatetheextractionofHDB3codebittiminginformation.HDB3codeasdatatransmissionan
6、dthusapattern,widelyused,asITUrecommendedpatternone.HDB3codingperformedbytherealizationofavarietyofways,thecommonsolutionisapplication-specifictransceiverchipHDB3,suchastheselectionofspecificE1transceiverandMCUDS2153Qtheconversionofthecodesystem.Thisa
7、rticleprovidesatheuseofmodernEDAtechnologytoACEXseriesFPGAchipEPlK10forthehardwareplatformfortheQuartusIIsoftwareplatformtoVHDL,forthedevelopmentoftoolsforFPGAimplementationoftheHDB3encoderdesign.HDB3yardHighDensityBip01arCodeofthreecodes,apairofpolar
8、ityyardofhighdensityforthreestepsItisanimportantcodewayofserialdatatransmission,itisoneoftheimportantcomponentsinthedigitalcommunicationsystemtoo.AndmostfrequentlyusedNRZyardNon-ReturnZero,doesnotreturnzeroyardCompare,HDB3yardhasalotofadvantag
