Thisisthefirsttextbookwhichpresentsthetheoryofpurediscretecommunicationsystemsanditsrelationtotheexistingtheoryofdigitalandanalogcommunicationsatagraduatelevel.Basedontheorthogonalityprinciplesandtheoryofdiscretetimestochasticprocesses,agenericstructureofcommunicationsystems,basedoncorrelationdemodulationandoptimumdetection,isdevelopedandpresentedintheformofmathematicaloperatorswithpreciselydefinedinputsandoutputsandrelatedfunctions.Basedonthisgenericstructure,thetraditionallydefinedphaseshiftkeying(PSK),frequencyshiftkeying(FSK),quadratureamplitudemodulation(QAM),orthogonalfrequencydivisionmultiplexing(OFDM)andcodedivisionmultipleaccess(CDMA)systemsarededucedasitsspecialcases.Themainchapters,presentingthetheoryofcommunications,aresupportedbyasetofsupplementarychapterscontainingthetheoryofdeterministicandstochasticsignalprocessing,whichmakesthebookaself-containedpresentationofthesubject.Thebookusesunifiednotationandunifiedterminology,whichallowsacleardistinctionbetweendeterministicandstochasticsignals,powersignalsandenergysignals,discretetimesignalsandprocessesandcontinuoustimesignalsandprocesses,andaneasywayofunderstandingthedifferencesindefiningthecorrelationfunctions,powerandenergyspectraldensities,andamplitudesandpowerspectraofthementionedsignalsandprocesses.Inadditiontosolvedexamplesinthetext,about300solvedproblemsareavailabletoreadersinthesupplementarymaterialthataimtoenhancetheunderstandingofthetheoryinthetext.Inaddition,fiveresearchProjectsareaddedtobeusedbylecturersorinstructorsthataimtoenhancetheunderstandingoftheoryandtoestablishitsrelationtothepractice.
