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Digital Communication (EC2301) Scanned Lecture Notes (All Units) - Charles Edition
#1


   
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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