Digital Communication (EC2301) Scanned Lecture Notes (All Units) - Charles Edition

  • 10Jan
  • 2015
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    Anna University , Chennai
    Department of B.E-Electronics and Communication Engg
    Fifth Semester
    EC2301 Digital Communication 
    (Regulation 2008) 


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    Content :
    UNIT-1
    Introduction to analog pulse communication system
    Pulse modulation
    1. Analog
    i. Pulse amplitude modulation
    ii. Pulse position modulation
    iii. Pulse duration modulation
    2. Digital
    i. PCM
    ii. DM
    iii. ADM
    iv. DPCM
    PAM
    Generation of PAM
    Detection of PAM
    Advantages
    Disadvantages
    PWM
    Generation of PWM
    Detection of PWM
    Advantages
    Disadvantages
    Input transducer
    Source encoder
    Channel encoder
    Base band processor
    Band pass modulator
    Natural source of noise
    Source decoder
    Output transducer
    Performance measure of communication
    1. Spectral efficiency
    2. Bit error rate
    Channel classification
    1. Wire-line
    2. Wireless channels
    Signal degradation
    1. Internal source of noise
    2. External source of noise
    Basic function
    Dimension of the signal space
    Orthogonal
    Problems
    Bandwidth 
    Noise equivalent bandwidth
    Null to null bandwidth
    Bounded power spectral bandwidth
    Mathematical model of communication channel
    1. Additive noise channel
    2. Linear filter channel
    3. Linear time variant filter channel
    4. Band limited signal
    Impulse response
    Linear- time variant filter channel

    UNIT-2
    BASE BAND FORMATTING TECHNIQUES
    Formatting text
    Formatting an analog signal
    Sampling
    Natural sampling
    Sampler implementation
    Sampling theory
    Quantization
    Derivation for signal to quantization noise ratio
    Ratio of peak SNR to average SNR
    Types of uniform quantization
    1. Mid-treat quantization
    2. Mid-rises quantization
    3. Biased quantization
    In coding techniques for analog source
     Types
    1. Temporal waveform
    2. Spectiral waveform
    3. Model based
    Quantization error
    PCM bandwidth
    Advantages
    Disadvantages
    Noise in PCM system
    DPCM (Differential Pulse code modulation)
    Delta modulation
    Spectral waveform coding
    Sub band coding
    Intercollation
    QMF ( Quuadrature Mirror Filter)

    UNIT-3
    BASE BAND CODING TECHNIQUES
    Types of code
    1. Blocks codes
    2. Convolution codes
    3. Linear codes
    4. Non-linear codes
    Code words
    Block length
    Code rate
    Channel data rate
    Code vectors
    Hammling distance
    Minimum distance
    Weight of the code
    Cyclic code
    Systematic form


    UNIT-4
    BASE BAND RECEPTION TECHNIQUES
    Baseband decoder
    Inter symbol interference
    Channel bandwidth
    Correlation type receiving filter
    Equalizing filter
    Nyquist pulse shaping of first type
    Transfer function
    Ideal nyquist pulse
    Advantages
    Road of factor
    Band rate of raised cosine filter
    Implementation of equalizing filter type
    1. Maximum sequence
    2. Filters
    i. Transversal
    ii. Decision feedback equalization

    UNIT-5
    BASE BAND SIGNAL TRANSMISSION AND RECEPTION
    Propogation losses
    Memory
    Phase shift keying
    Representation of PSK modulation signal
    Generation of FSK
    Spectral characteristics
    Co-herent binary PSK demodulation
    Binary phase shift keying
      Symbol synchronization
    Types
    1. Symbol
    2. Carrier
    3. Frames

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