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1、DigitalSignalProcessing:APracticalGuideByMichaelParker,AlteraCorporationSeriesPart3of7Re-IntroductionThisisabookintendedforthosewhoworkinorprovidecomponentsforindustrieswhicharemadepossiblebyDigitalSignalProcessing,orDSP.Exampleindustriesarewirelessmobilephoneandin
2、frastructureequipment,broadcastandcablevideo,DSLmodems,satellitecommunications,medicalimaging,audio,radar,sonar,surveillance,electricalmotorcontrol–thislistgoeson.WhiletheengineerswhoimplementthesesystemsmustbeveryfamiliarwithDSP,therearemanyothers–executiveandmid-
3、levelmanagement,marketing,technicalsalesandfieldengineers,businessdevelopmentandotherswhocanbenefitfromabasicknowledgeofthefundamentalprincipalsofDSP.Thatisthepurposeofthisbook-toprovideabasictutorialonDSP.Thisisatopicwhichseemstohaveadearthofeasytoreadandunderstan
4、dexplanations.Unlikemosttechnicalresources,thisisatreatmentwheremathematicsisminimizedandintuitiveunderstandingmaximized.Thisbookattemptstode-mystifymanydifficultconceptslikesampling,aliasing,imaginarynumbers,frequencyresponseusingeasytounderstandexamples.Inadditio
5、n,thereisanoverviewoftheDSPfunctionsandimplementationusedinseveralDSPintensivefieldsorapplications,fromerrorcorrectiontoCDMAmodemstoradarsystems.SeeSeriesPart#1at:http://www.techonline.com/showArticle.jhtml?articleID=221900965&queryText=Digital+Signal+Processing%3A
6、+A+Practical+GuideSeeSeriesPart#2at:http://www.techonline.com/showArticle.jhtml?articleID=222301434&queryText=Digital+Signal+Processing%3A+A+Practical+Guide1www.newnespress.comChapter9.ComplexModulationandDemodulationWe’regoingtotrytotakeanunusualapproachhere,asthe
7、normalexplanationsonthistopicareheavilybasedonmathandequations.Here,we’lltakeanalmostentirelyintuitiveapproach,baseduponexamples.There’snoattempttoestablishanyrigorousmathematicalfoundationortocalculateperformance.Modulationistheprocessoftakinginformationbitsandmap
8、pingthemtosymbols.Thesequenceofsymbolsisthenfilteredtoproduceabasebandwaveform,withthedesiredspectralproperties.Thisbasebandwaveformorsignalisthe
