PRINCIPLES OF COMMUNICATION SYSTEMS
Subject Code:18EC53
CIE Marks:40
SEE Marks:60
Number of Lecture Hours/Week 3+2 (Tutorial)
Exam Hours:03
CREDITS: 04
Course Learning Objectives: This course will enable students to
• Understand and analyse concepts of Analog Modulation schemes viz; AM, FM., Low pass sampling and Quantization as a random process.• Understand and analyse concepts digitization of signals viz; sampling, quantizing and encoding.
• Evolve the concept of SNR in the presence of channel induced noise and study Demodulation of analog modulated signals.
• Evolve the concept of quantization noise for sampled and encoded signals and study the concepts of reconstruction from these samples at a receiver.
Module-1
AMPLITUDE MODULATION: Introduction, Amplitude Modulation: Time & Frequency Domaindescription, Switching modulator, Envelop detector. (3.1 – 3.2 in Text)
DOUBLE SIDE BAND-SUPPRESSED CARRIER MODULATION: Time and Frequency
Domain description, Ring modulator, Coherent detection, Costas Receiver, Quadrature Carrier
Multiplexing. (3.3 – 3.4 in Text)
SINGLE SIDE–BAND AND VESTIGIAL SIDEBAND METHODS OF MODULATION: SSB
Modulation, VSB Modulation, Frequency Translation, Frequency- Division Multiplexing,Theme
Example: VSB Transmission of Analog and Digital Television. (3.5 – 3.8 in Text)
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 (4.1 – 4.6 of Text)
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 (4.1 – 4.6 of Text)
Module-3
[Review of Mean, Correlation and Covariance functions of Random Processes.(No questions to be set on these topics)]
NOISE - Shot Noise, Thermal noise, White Noise, Noise Equivalent Bandwidth (5.10 in Text)
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 (6.1 – 6.6 in Text)
Click here to download module-3
Module-4
SAMPLING AND QUANTIZATION: Introduction, Why Digitize Analog Sources?, The Lowpass Sampling process Pulse Amplitude Modulation. Time Division Multiplexing, Pulse-Position
Modulation, Generation of PPM Waves, Detection of PPM Waves.(7.1 – 7.7 in Text)
Click here to download module-4
Module-5
SAMPLING AND QUANTIZATION (Contd):The Quantization Random Process, Quantization Noise,
Pulse–Code Modulation: Sampling, Quantization, Encoding, Regeneration, Decoding, Filtering,
Multiplexing; Delta Modulation (7.8 – 7.10 in Text),
Application examples - (a) Video + MPEG (7.11 in Text) and (b) Vocoders(refer Section 6.8 of
Reference Book 1).
Course Outcomes: After studying this course, students will be able to:
• Analyze and compute performance of AM and FM modulation in the presence of noise at the receiver.• Analyze and compute performance of digital formatting processes with quantization noise.
• Multiplex digitally formatted signals at Transmitter and demultiplex the signals and reconstruct
digitally formatted signals at the receiver.
• Design/Demonstrate the use of digital formatting in Multiplexers, Vocoders and Video transmission.
Question paper pattern:
• Examination will be conducted for 100 marks with question paper containing 10 full questions, each of 20 marks.
• Each full question can have a maximum of 4 sub questions.
• There will be 2 full questions from each module covering all the topics of the module.
• Students will have to answer 5 full questions, selecting one full question from each module.
• The total marks will be proportionally reduced to 60 marks as SEE marks is 60.
• Each full question can have a maximum of 4 sub questions.
• There will be 2 full questions from each module covering all the topics of the module.
• Students will have to answer 5 full questions, selecting one full question from each module.
• The total marks will be proportionally reduced to 60 marks as SEE marks is 60.
Text Book:
“Communication Systems”, Simon Haykins&Moher, 5th Edition, John Willey, India Pvt. Ltd, 2010, ISBN978 – 81 – 265 – 2151 – 7.
Reference Books:
1. Modern Digital and Analog Communication Systems, B. P. Lathi, Oxford University Press., 4thedition.
2. An Introduction to Analog and Digital Communication, Simon Haykins, John Wiley India Pvt. Ltd.,
2008, ISBN 978–81–265–3653–5.
3. Principles of Communication Systems, H.Taub&D.L.Schilling, TMH,2011.
4. Communication Systems, Harold P.E, Stern Samy and A.Mahmond, Pearson Edition, 2004.
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