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: firstname.lastname@example.org 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