Principles of Digital Communication(正式版)[Gallager] .pdf

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1、ThispageintentionallyleftblankPrinciplesofDigitalCommunicationTherenownedcommunicationtheoristRobertGallagerbringshislucidwritingstyletothisfirst-yeargraduatetextbookonthefundamentalsystemaspectsofdigitalcommu-nication.Withtheclarityandinsightthathavecharacterizedhisteachingandearliertextbookshedeve

2、lopsasimpleframeworkandthencombinesthiswithcarefulproofstohelpthereaderunderstandmodernsystemsandsimplifiedmodelsinanintuitiveyetpreciseway.Althoughmanyfeaturesofvariousmoderndigitalcommunicationsystemsarediscussed,thefocusisalwaysonprinciplesexplainedusingahierarchyofsimplemodels.Amajorsimplifyingp

3、rincipleofdigitalcommunicationistoseparatesourcecodingandchannelcodingbyastandardbinaryinterface.Datacompression,i.e.,sourcecoding,isthentreatedastheconversionofarbitrarycommunicationsourcesintobinarydatastreams.Similarlydigitalmodulation,i.e.,channelcoding,becomestheconversionofbinarydataintowavefo

4、rmssuitablefortransmissionovercommunicationchannels.Thesewaveformsareviewedasvectorsinsignalspace,modeledmathematicallyasHilbertspace.Aself-containedintroductiontorandomprocessesisusedtomodelthenoiseandinterferenceincommunicationchannels.Theprinciplesofdetectionanddecodingarethendevelopedtoextractth

5、etransmitteddatafromnoisyreceivedwaveforms.AnintroductiontocodingandcodedmodulationthenleadstoShannon’snoisy-channelcodingtheorem.Thefinaltopiciswirelesscommunication.Afterdevelopingmodelstoexplainvariousaspectsoffading,thereisacasestudyofcellularCDMAcommunicationwhichillustratesthemajorprinciplesof

6、digitalcommunication.Throughout,principlesaredevelopedwithbothmathematicalprecisionandintu-itiveexplanations,allowingreaderstochoosetheirownmixofmathematicsandengineering.Anextensivesetofexercisesrangesfromconfidence-buildingexamplestomorechallengingproblems.Instructorsolutionsandotherresourcesareav

7、ailableatwww.cambridge.org/9780521879071.‘Prof.Gallagerisalegendaryfigureknownforhisinsightsandexcellentstyleofexposition’ProfessorLangTong,CornellUniversity‘acompellingread’ProfessorEmreTelatar,EP