Thisbooksystematicallyintroducedthefundamentalsofinformationtheory,focusingonthebasicmodelofcommunicationsystems．Itconsistsof11Chapters,includingtwoparts,namely,basicconceptionsofinforＧmationtheoryandrelatedapplicationsofinformationtheory．Thefirstpartcontainsstatisticalmeasureofinformation,discretesource,losslesssourcecodinganddatacompression,discretechannelanditscapacity,channelcoding,whilethesecondpartincludesratedistortion,continuoussource,continuouschannelanditscapacity,maximumentropyandspectrumestimationaswellascomputersimulationexperimentsrelevanttoinformationtheory．
　　Thisbooksummarizedtheexperienceoftheauthorsonteachinginformationcoursein EnglishandChinese,togetherwiththeirunderstandingsfromyearsscientificresearchpractice．Itcanbeusedasteachingmaterialoninformationtheorycourseforbothinternationalundergraduateandgraduatestudents．

Chapter1　Introduction ………………………………………………………………………… 1
1．1　Conceptofinformation ………………………………………………………………… 1
1．2　Historyofinformationtheory ………………………………………………………… 2
1．3　Information,messagesandsignals …………………………………………………… 3
1．4　Communicationsystem model ………………………………………………………… 3
1．5　Informationtheoryapplications ……………………………………………………… 4
1．5．1　Electricalengineering(communicationtheory)………………………………… 4
1．5．2　Computerscience(algorithmiccomplexity) …………………………………… 5
Exercises ……………………………………………………………………………………… 5
Chapter2　StatisticalMeasureofInformation ………………………………………………… 6
2．1　Informationofrandomevents ………………………………………………………… 6
2．1．1　SelfＧinformation …………………………………………………………………… 6
2．1．2　ConditionalselfＧinformation ……………………………………………………… 6
2．1．3　Mutualinformationofevents …………………………………………………… 7
2．2　Informationofdiscreterandomvariables …………………………………………… 8
2．2．1　Entropyofdiscreterandomvariables …………………………………………… 8
2．2．2　Jointentropy……………………………………………………………………… 11
2．2．3　Conditionalentropy ……………………………………………………………… 11
2．2．4　Mutualinformationofdiscreterandomvariables …………………………… 11
2．3　Relationshipbetweenentropyandmutualinformation …………………………… 11
2．4　Mutualinformationandentropyofcontinuousrandomvariables………………… 12
2．4．1　Mutualinformationofcontinuousrandomvariables ………………………… 12
2．4．2　Entropyofcontinuousrandomvariables ……………………………………… 13
Exercises ……………………………………………………………………………………… 14
Chapter3　DiscreteSourceandItsEntropyRate …………………………………………… 15
3．1　Mathematicalmodelofsource ……………………………………………………… 15
3．1．1　Discretesourceandcontinuoussource ………………………………………… 16
3．1．2　Simplediscretesourceanditsextension ……………………………………… 17
3．1．3　Memorylesssourceandsourcewithmemory ………………………………… 18
3．2　Discretememorylesssource ………………………………………………………… 18
3．2．1　Definition ………………………………………………………………………… 18
3．2．2　Extensionofdiscretesource …………………………………………………… 19
3．3　Discretestationarysource …………………………………………………………… 20
3．3．1　Definition ………………………………………………………………………… 20
3．3．2　Entropyrateofdiscretestationarysource …………………………………… 21
3．4　DiscreteMarkovsource ……………………………………………………………… 24
3．4．1　Markovchain …………………………………………………………………… 24
3．4．2　Transitionprobability …………………………………………………………… 25
3．4．3　Markovsourceanditsentropyrate …………………………………………… 28
Exercises ……………………………………………………………………………………… 31
Chapter4　LosslessSourceCodingandDataCompression ………………………………… 33
4．1　Asymptoticequipartitionpropertyandtypicalsequences ………………………… 33
4．2　Losslesssourcecoding ……………………………………………………………… 34
4．2．1　Encoder …………………………………………………………………………… 34
4．2．2　Blockcode ………………………………………………………………………… 35
4．2．3　Fixedlengthcode………………………………………………………………… 36
4．2．4　Variablelengthcode …………………………………………………………… 42
4．3　Datacompression ……………………………………………………………………… 48
4．3．1　Shannoncoding ………………………………………………………………… 49
4．3．2　Huffmancoding ………………………………………………………………… 50
4．3．3　Fanocoding ……………………………………………………………………… 52
Exercises ……………………………………………………………………………………… 52
Chapter5　DiscreteChannelandItsCapacity ……………………………………………… 54
5．1　Mathematicalmodelofchannel ……………………………………………………… 54
5．2　Discretememorylesschannel ………………………………………………………… 55
5．2．1　Mathematicalmodelofdiscretememorylesschannel ………………………… 55
5．2．2　SimpleDMC ……………………………………………………………………… 56
5．2．3　Extensionofdiscretememorylesschannel …………………………………… 60
5．3　Channelcombination ………………………………………………………………… 65
5．4　Channelcapacity ……………………………………………………………………… 70
5．4．1　Conceptofchannelcapacity …………………………………………………… 70
5．4．2　Channelcapacityofseveralspecialdiscretechannels ………………………… 71
5．4．3　Channelcapacityofsymmetricchannels ……………………………………… 73
5．4．4　ChannelcapacityofextendedDMC …………………………………………… 75
5．4．5　ChannelcapacityofindependentparallelDMC ……………………………… 76
5．4．6　Channelcapacityofthesumchannel…………………………………………… 77
5．4．7　Channelcapacityofgeneraldiscretechannels ………………………………… 78
Exercises ……………………………………………………………………………………… 79
Chapter6　NoisyＧchannelCoding ……………………………………………………………… 81
6．1　Probabilityoferror …………………………………………………………………… 81
6．2　Decodingrules ………………………………………………………………………… 83
6．3　Channelcoding ………………………………………………………………………… 84
6．3．1　Simplerepetitioncode …………………………………………………………… 84
6．3．2　Linearcode ……………………………………………………………………… 87
6．4　NoisyＧchannelcodingtheorem ……………………………………………………… 91
Exercises ……………………………………………………………………………………… 91
Chapter7　RateDistortion …………………………………………………………………… 93
7．1　Quantization …………………………………………………………………………… 93
7．2　Distortiondefinition…………………………………………………………………… 94
7．2．1　Distortionfunction ……………………………………………………………… 94
7．2．2　MeanＧdistortion ………………………………………………………………… 95
7．3　Ratedistortionfunction ……………………………………………………………… 97
7．3．1　Fidelitycriterionforgivenchannel …………………………………………… 97
7．3．2　Definitionofratedistortionfunction…………………………………………… 98
7．3．3　Propertyofratedistortionfunction …………………………………………… 98
7．4　Ratedistortiontheoremandtheconverse ………………………………………… 101
7．5　Thecalculationofratedistortionfunction ………………………………………… 103
Exercises …………………………………………………………………………………… 105
Chapter8　ContinuousSourceandItsEntropyRate ……………………………………… 107
8．1　Continuoussource …………………………………………………………………… 107
8．2　Entropyofcontinuoussource ……………………………………………………… 107
8．3　Maximumentropyofcontinuoussource…………………………………………… 109
8．4　Jointentropy,conditionalentropyandmutualinformationforcontinuous
randomvariables …………………………………………………………………… 109
8．5　Entropyrateofcontinuoussource ………………………………………………… 111
8．6　Ratedistortionforcontinuoussource ……………………………………………… 114
Exercises …………………………………………………………………………………… 117
Chapter9　ContinuousChannelandItsCapacity …………………………………………… 119
9．1　Capacityofcontinuouschannel …………………………………………………… 119
9．1．1　CapacityofdiscreteＧtimechannel……………………………………………… 119
9．1．2　CapacityofcontinuousＧtimechannel ………………………………………… 120
9．2　TheGaussianchannel ……………………………………………………………… 121
9．3　BandＧlimitedchannels ……………………………………………………………… 122
9．4　Codingtheoremforcontinuouschannel …………………………………………… 123
Exercises …………………………………………………………………………………… 124
Chapter10　MaximumEntropyandSpectrumEstimation ………………………………… 125
10．1　Maximumentropyprobabilitydistribution ……………………………………… 125
10．1．1　Maximumentropydistribution ……………………………………………… 125
10．1．2　Examples ……………………………………………………………………… 126
10．2　Maximumentropyspectrumestimation ………………………………………… 127
10．2．1　Burgsmaxentropytheorem ………………………………………………… 127
10．2．2　Maximumentropyspectrumestimation …………………………………… 130
Exercises …………………………………………………………………………………… 137
Chapter11　ExperimentsofInformationTheory …………………………………………… 138
11．1　Measureofinformation …………………………………………………………… 138
11．1．1　Informationcalculator ………………………………………………………… 138
11．1．2　Propertiesofentropy ………………………………………………………… 139
11．2　SimulationofMarkovsource ……………………………………………………… 140
11．3　Performancesimulationforsourcecoding ……………………………………… 141
11．3．1　Shannoncoding ……………………………………………………………… 142
11．3．2　Huffmancoding ……………………………………………………………… 143
11．3．3　Fanocoding …………………………………………………………………… 144
11．4　SimulationofBSC ………………………………………………………………… 144
11．5　Simulationofthecascadechannel ………………………………………………… 145
11．6　Calculationofchannelcapacity …………………………………………………… 148
11．7　Decodingrules ……………………………………………………………………… 149
11．8　Performancedemonstrationofchannelcoding…………………………………… 150
References ……………………………………………………………………………………… 152