Anna University , Chennai
Department of B.E-Electrical and Electronics Engg
Fifth Semester
EC2311 Communication Engineering
Scanned Lecture Notes (Units 1 , 2 , 3 and 4)
(Regulation 2008)
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COMMUNICATION ENGINEERING
UNIT-1
ANALOG COMMUNICATION
Communication
Sender or transmitter
Receiver
Communication channel
AM (Amplitude Modulation)
Classification of modulation
Modulation
1. Analog modulation
2. Digital modulation
Amplitude modulation
Mathematical representation of an AM wave
AM frequency spectrum
Side bands
Phaser representation of an AM with carrier
Power relation
Carrier power
Power in the side bands
Generation of the AM –DSB
Based on the power level
Low level AM modulation
Emitter modulator
High level AM modulation
Principle of operation
Generation of AM wave using non-linear properties
Square law modulation
1. A non-linear device
2. A band pass filter
3. A carrier source andmodulating signal
Balanced modulator
DSB-SC
Modification of amplitude modulation
SSB-SC
Transmission bandwidth
Power calculation
AM transmitter
Low level modulated AM transmitted
High level modulated AM transmitted
AM receiver
Function of the receiver
1. Carrier frequency tunning
2. Filtering
3. Amplification
Receiver parameters
Selectivity
Classification of AM receiver
Tuned radio frequency
Operation
AM super heterodyne receiver
Angle modulation
Classification
1. Frequency modulation
2. phase modulation
Representation of PM
Modulation index of PM
Deviation sensitivity
Frequency modulation
Representation of FM
Frequency deviation
Modulation index
Deviation ratio
Percentage modulation of FM wave
Types of frequency modulation
Narrow band FM
Principle of operation
Wide band FM
Generaton of FM
Direct method
Indirect method
Reactance tube modulation
Armstrong method
UNIT-2
DIGITAL COMMUNICATION
Pulse modulation
Sampling process
Sampling theorem
Types of sampling method
1. Ideal
2. Natural sampling
3. Flat topped sampling
Nyquist rate
Aliasing
Pulse ampliyude modulation
Types of PAM
1. Natural PAM
2. Falt top PAM
Generation of natural PAM
Pulse type modulation
Detection of the flat top PAM
Pulse position modulation
PPM signal demodulation
Quantization and coding
Types
1. Uniform
2. Non-uniform
Encoding
Types of line code
DPCM , DM , and ADM
Delta modulation
DM receiver
Quantization noise
Granular noise
ADM transmitter
ADM receiver
Pass band data transmission
Classification of digital modulation detection techniques
1. Coherent
2. Non-coherent
ASK generator
ASK waveform
ASK detector
FSK generation
Frequency deviation
Phase shift keying
BPSK generation
BPSK detection
QPSK receiver
Minimum shift keying
MSK transmitter
QAM
UNIT-3
SOURCE CODE , LINE CODE AND ERROR CONTROL
Primary communication
Amount of information
Principle
Units of information
Properties of information
Average information
Rate of infprmation
Discrete memoryless channels
Binary symmetric channel
Mutual information
Properties
Channel capacity
Noise free channel
Symmetric channel
Source coding
Data compensation
Prefix coding
Huffman coding
Noise less coding theorem
Shannon’s first theorem
BW-SNR trade off codes
Types of line coding
1. Polar
2. Unipolar
3. Bipolar
Error control codes
Types of code
UNIT -4
MULTIPLE ACCESS TECHNIQUES
Introduction
Duplexing
Guard bands
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