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ECE203 MODULATION TECHNIQUES L T P C
3 0 2 4
Course Prerequisites: ECE207 ANALOG ELECTRONIC CIRCUITS
Objectives:
To introduce the elements of communication systems, describe the
generalized block
diagram and the types of communication systems.
To discuss the concepts of noise, noise voltage, noise
temperature, SNR of various
modulation schemes.
To explain the need for modulation and describe the concepts
behind the CW, PM,
Angle modulation techniques.
To illustrate and explain various pulse modulation
techniques
Expected Outcome: On completion of the course the student shall
be able to
Analyze the effects of noise in CW &angle modulation
Demonstrate the generation and detection of amplitude and angle
modulation
techniques
Identify and compare different pulse modulation techniques
Unit 1 Introduction to Communication System
Need and Importance of Communication, Elements of Communication
System, Generalizedblock diagram of communication system, Role of
each block (information source,transmitter, channel/communication
media, receiver).
Types of communication systems- Simplex and Duplex systems,
Analog and digital systems,Applications of Electronic
Communications, Electromagnetic Spectrum used incommunication and
various frequency bands, Concept of bandwidth.
Unit 2 Noise
Noise in communication and types of noise (External and
Internal), Noise voltage, Signal-to-noise ratio, Noise figure,
Noise temperature.
Unit 3 Amplitude Modulation
Need for modulation amplitude modulation frequency spectrum
Power relation different types of modulators SSB and VSB modulation
and demodulation. AM transmitters Block diagram functions of each
block high level transmitters- Problems.
Unit 4 Angle modulation
Principle of frequency and phase modulation Relation between FM
and PM waves Bandwidth of FM Narrow band wide band FM Generation of
FM wave Direct and Indirectmethods FM transmitters Block diagram
functions of each block- Problems.
Unit 5 Detection and Receivers
Detection Diode detectors Synchronous detection FM detectors
slope detectors
Phase discriminators Ratio detectors. Receiver different types
super hetero dynereceivers Block diagram Choice of IF and
Oscillator frequencies Tracking alignment AVC, AFC Receiver
characteristics.
Unit 6 Pulse modulation systems
Sampling theorem Pulse amplitude modulation Channel bandwidth
for PAM detection ofPAM signals Pulse width modulation generation
of PWM and PPM conversion of PWM toPPM detection of PWM and PPM
Time division multiplexing Frequency divisionmultiplexing.
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Text Books
1. G. Kennedy, Electronic Communication Systems, McGraw Hill,
1984.2. Roddy and Coolen, Communication Systems, Prentice Hall of
India, 2001
Reference Books1. Taub and Schilling, Principles of
Communication Systems, McGraw Hill, 1989.2. Bruce Carlson,
Communication Systems, McGraw Hill, 1985.3. Wayne Tomasi,
Electronic Communications Systems Fundamentals Through
advanced, 4th Edition, Pearson Education, 2001.
Mode of Evaluation
CAT- I & II, Assignments/ Quiz, Term End Examination
List of Experiments:
1. Amplitude modulation
2. Amplitude demodulation
3. Frequency modulation4. Frequency demodulation
5. Pulse amplitude modulation
6. Pulse width modulation
7. Mixer
8. Pre-emphasis
9. De-emphasis
10. Sample and Hold Circuit.
11. Noise calculation in AM receiver using MATLAB.
12. Noise calculation in FM receiver using MATLAB.
