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Modern Digital and Analog Communication Systems, B. P. Lathi, Oxford University Press., 4th edition.
An Introduction to Analog and Digital Communication, Simon Haykins, John Wiley India Pvt. Ltd., 2008,
ISBN 978–81–265–3653–5.

S. S. EDUCATION TRUST (R)
S. G. BALEKUNDRI INSTITUTE OF TECHNOLOGY
SHIVABASAV NAGAR BELAGAVI-10
PRINCIPLES OF COMMUNICATION SYSTEMS [15EC45]
Notes as per VTU Syllabus for IV Semester
Electronics & Communication Engineering
Mr. Sunil S Harakannanavar BE,M.tech (Control Systems)
Assistant Professor
Department Of Electronics & Communication Engineering
S G Balekundri Institute Of Technology, Belagavi-10
Email: sunilsh143@gmail.com
Mobile: 7411844948

PRINCIPLES OF COMMUNICATION SYSTEMS
[As per Choice Based Credit System (CBCS) Scheme]
SEMESTER – IV (E&CE)
Subject Code
15EC45
IA Marks
Number of Lecture Hours/Week
04
Exam Hours
Total Number of Lecture Hours
50
Exam Marks
20
03
80
CREDITS – 04
Course objectives: This course will enable students to:
Design simple systems for generating and demodulating AM, DSB, SSB and VSB signals
Understand the concepts in Angle modulation for the design of communication systems
Design simple systems for generating and demodulating frequency modulated signals
Learn the concepts of random process and various types of noise.
Evaluate the performance of the communication system in presence of noise.
Analyze pulse modulation and sampling techniques.
Modules
Teaching
Hours
(RBT)Level
MODULE 1
AMPLITUDE MODULATION: Introduction, Amplitude Modulation: Time &
Frequency – Domain description, Switching modulator, Envelop detector.
DOUBLE SIDE BAND-SUPPRESSED CARRIER MODULATION: Time and
Frequency – Domain description, Ring modulator, Coherent detection, Costas
Receiver, Quadrature Carrier Multiplexing.
SINGLE SIDE–BAND & VESTIGIAL SIDEBAND METHODS OF
MODULATION: SSB Modulation, VSB Modulation, Frequency Translation,
Frequency- Division Multiplexing, Theme Example: VSB Transmission of Analog
and Digital Television.
10 Hours
L1, L2, L3
10 Hours
L1, L2, L3
10 Hours
L1, L2, L3
10 Hours
L1, L2, L3
MODULE 2
ANGLE MODULATION: Basic definitions, Frequency Modulation: Narrow Band
FM, Wide Band FM, Transmission bandwidth of FM Signals, Generation of FM
Signals, Demodulation of FM Signals, FM Stereo Multiplexing, Phase–Locked
Loop: Nonlinear model of PLL, Linear model of PLL, Nonlinear Effects in FM
Systems. The Superheterodyne Receiver.
MODULE 3
RANDOM VARIABLES & PROCESS: Introduction, Probability, Conditional
Probability, Random variables, Several Random Variables. Statistical Averages:
Function of a random variable, Moments, Random Processes, Mean, Correlation
and Covariance function: Properties of autocorrelation function, Cross–correlation
functions.
NOISE: Shot Noise, Thermal noise, White Noise, Noise Equivalent Bandwidth,
Noise Figure.
MODULE 4
NOISE IN ANALOG MODULATION: Introduction, Receiver Model, Noise in
DSB-SC receivers, Noise in AM receivers, Threshold effect, Noise in FM receivers,
Capture effect, FM threshold effect, FM threshold reduction, Pre-emphasis and
De-emphasis in FM.

MODULE 5
DIGITAL REPRESENTATION OF ANALOG SIGNALS: Introduction, Why
Digitize Analog Sources?, The Sampling process, Pulse Amplitude Modulation,
Time Division Multiplexing, Pulse-Position Modulation, Generation of PPM
Waves, Detection of PPM Waves, The Quantization Process, Quantization Noise,
PULSE–CODE
MODULATION:
Sampling,
Quantization,
Encoding,
Regeneration, Decoding, Filtering, Multiplexing, Application to Vocoder.
10 Hours
L1, L2, L3
Course Outcomes:
At the end of the course, students will be able to:
Determine the performance of analog modulation schemes in time and frequency domains.
Determine the performance of systems for generation and detection of modulated analog signals.
Characterize analog signals in time domain as random processes and in frequency domain using Fourier
transforms.
Characterize the influence of channel on analog modulated signals
Determine the performance of analog communication systems.
Understand the characteristics of pulse amplitude modulation, pulse position modulation and pulse code
modulation systems.
Graduating Attributes (as per NBA)
Engineering Knowledge
Problem Analysis
Design / development of solutions (partly)
Question paper pattern:
The question paper will have ten questions.
Each full Question consisting of 16 marks.
There will be 2 full questions (with a maximum of four sub questions) from each module.
Each full question will have sub questions covering all the topics under a module.
The students will have to answer 5 full questions, selecting one full question from each module.
Text Book:
Communication Systems, Simon Haykins & Moher, 5th Edition, John Willey, India Pvt. Ltd, 2010, ISBN
978 – 81 – 265 – 2151 – 7.
Reference Books:
Modern Digital and Analog Communication Systems, B. P. Lathi, Oxford University Press., 4th edition.
An Introduction to Analog and Digital Communication, Simon Haykins, John Wiley India Pvt. Ltd., 2008,
ISBN 978–81–265–3653–5.
Principles of Communication Systems, H.Taub & D.L.Schilling, TMH, 2011.
Communication Systems, Harold P.E, Stern Samy and A Mahmond, Pearson Edition, 2004.
Communication Systems: Analog and Digital, R.P.Singh and S.Sapre: TMH 2nd edition, 2007.

INDEX
SL.NO CHAPTER
CONTENTS
PAGE
NO.
1
2
3
MODULE 1
MODULE 2
MODULE 3
AMPLITUDE MODULATION: Introduction
Time & Frequency – Domain description
Switching modulator
Envelop detector
DOUBLE SIDE BAND-SUPPRESSED CARRIER
MODULATION: Time and Frequency – Domain description
Ring modulator
Coherent detection
Costas Receiver
Quadrature Carrier Multiplexing
SINGLE SIDE–BAND & VESTIGIAL SIDEBAND METHODS
OF MODULATION: SSB Modulation ,VSB Modulation
Frequency Translation
Frequency- Division Multiplexing.
ANGLE
MODULATION:
Basic
definitions,
Modulation:
Narrow Band FM, Wide Band FM
Transmission bandwidth of FM Signals
Generation of FM Signals
Demodulation of FM Signals
Phase–Locked Loop: Nonlinear model of PLL
Linear model of PLL
Nonlinear Effects in FM Systems
FM Stereo Multiplexing
The Superheterodyne Receiver
Frequency
RANDOM VARIABLES & PROCESS: Introduction
Random variables
Probability, Conditional Probability
Several Random Variables
Statistical Averages: Function of a random variable
Random Processes, Mean
Moments Correlation
Covariance function: Properties of autocorrelation function
Cross–correlation functions
NOISE: Shot Noise
Thermal noise
White Noise
Noise Equivalent Bandwidth
Noise Figure.
1-4
5-13
14-16
17-26
27-18
29-31
32-32
33-34
35-38
43-48
49-52
53-56
1-9
14-15
15-16
18-24
24-29
33-34
34-36
35-37
37-40
40-44
------------------------------------------------------------------------1-4
5-7
8-9
9-12
13-13

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