SASTRA Deemed to be University
L
T
P
C
4
0
0
4
M. Sc. in Physics
Course Code: ECS215
Semester: III
COMMUNICATION SYSTEMS
COURSE OBJECTIVES
This course aims to enable the learner to understand the basic principles that are used in
the analysis and design of analog and digital communication systems. The course will
discuss the fundamentals of communication systems, including AM, FM, pulse modulation
and transmitters & receivers. The course will also examine current issues in the rapidly
changing field of communications
UNIT-I
12 Periods
Amplitude Modulation
Modulation - Types of modulation (AM, FM and PM) - Mathematical expression for AM wave
- Modulation index - Spectrum of AM wave, Component phasor of AM signal, Power and
current relations. Generation of AM waves - Linear modulation - Collector, base and emitter
modulation - Non Linear modulation-Square law modulator - Balanced Modulator - SSB-SC
generation - Demodulation of AM waves - Envelope and Square law Detector - Synchronous
detector - Costas Loop.
UNIT-II
12 Periods
Angle Modulation
Angle Modulation - Frequency and Phase Modulation - Mathematical expression for FM and
PM Generation of FM - Direct and Indirect method - Relationship between FM and PM - Preemphasis and de-emphasis in FM.
Demodulation of FM waves - using PLL, Slope detector - Balanced Slope Detector – FosterSeeley discriminator - Ratio Detector
UNIT-III
12 Periods
Transmitters and Receivers
AM transmitters, SSB transmitter, ISB - AM receivers- Receiver parameters,
Superheterodyne receivers- Choice of IF frequencies, SSB receiver with pilot carrier FM
transmitter - Crosby Direct transmitter, Armstrong FM Transmitter, FM stereo BroadcastingFM Receivers - Superheterodyne Receivers -Amplitude Limiter- FM stereo Receiver.
UNIT-IV
12 Periods
Optical Communication
Principles of the PN Junction Photodiode - Ramo's Theorem and External Photocurrent Absorption Coefficient and Photodiode Materials - Quantum Efficiency and Responsivity PIN diode - Avalanche Photodiode – Phototransistors - Solar Energy Spectrum Photovoltaic Device Principles - PN Junction Photo Voltaic I-V characteristics - Series
Resistance and Equivalent Circuit - Temperature Effects.
UNIT-V
12 Periods
Multiplexing and Multiple Accesses
Allocation of the Communications Resource - Multiplexing, Frequency Division Multiplexing
(FDM), Time Division Multiplexing (TDM) - Multiple Access, Frequency Division Multiple
44
SASTRA Deemed to be University
M. Sc. in Physics
Access(FDMA), Time Division Multiple Access (TDMA) - Spread Spectrum Multiple Access,
Code Division Multiple Access (CDMA), Frequency Hopped Spread Spectrum(FH-SS) Mobile & Satellite Communication Systems (Principle & Block Diagram Only).
.
REFERENCES
1. H. Taub, and D.L Schilling, Principles of Communication Systems, 2nd edition,
McGraw Hill, 2017
2. V. Chandrasekar, Analog Communication, 3rd edition, Oxford University Press, 2012.
3. S. Haykin, Communication Systems, 4th Edition, Wiley India, 2009
4. G. Kennedy, and B. Davis, Electronic Communication Systems, 4th edition, Tata
McGraw Hill, 2006.
5. W. Tomasi, Electronic Communication Systems, 4th edition, Pearson Education,
2006.
6. J.G. Proakis, and M. Saleh, Communication Systems, 4th edition, Pearson education,
2006.
7. B. Sklar, Digital Communication, 2nd edition, Pearson education India, 2006
8. R. P. Singh, and S. D. Sapre, Communication Systems Analog and Digital, Tata
McGraw Hill, 2002.
ONLINE MATERIALS
1. http://nptel.ac.in/video.php?subjectId=117102059
2. https://www.youtube.com/watch?v=TPm0XSPxld8
LEARNING OUTCOMES
Upon successful completion of this course, the learner will be able to:
Unit I
Demonstrate an understanding of the basics of modulation and elements of
amplitude modulation
Unit II
Explain the basic of frequency modulation and various phase and frequency
modulation techniques
Unit III
Acquire knowledge on basic concepts of transmitters and receivers and
their designing
Unit IV
Analyze the digital modulation
Describe various modulation/demodulation techniques
Unit V
Enumerate the basics of multiplexing and multiple access points
OVERALL LEARNING OUTCOMES
Upon successful completion of this course, the learner will be able to explain various types
of modulations and able to design transmitters and receivers.
45