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Note for Analog Communication Technique - ACT by Jitendra Pal

  • Analog Communication Technique - ACT
  • Note
  • Biju Patnaik University of Technology BPUT - BPUT
  • Electronics and Communication Engineering
  • B.Tech
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ANALOG COMMUNICATION TECHNIQUES PCEC 4302 ELECTRONICS & TELECOMMUNICATION ENGINEERING 5th SEMESTER (B.Tech) Ashima Rout ashimarout@gmail.com Jyotirekha Das jyotirekha43@gmail.com Rashmita Sethy sethyrasmita@gmail.com 1

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Disclaimer: This document does not claim any originality and cannot be used as a substitute for prescribed textbooks. The information presented here is merely a collection by the committee faculty members for their respective teaching assignments as an additional tool for the teaching-learning process. Various sources as mentioned at the reference of the document as well as freely available material from internet were consulted for preparing this document. The ownership of the information lies with the respective authors or institutions. Further, this document is not intended to be used for commercial purpose and the committee faculty members are not accountable for any issues, legal or otherwise, arising out of use of this document. The committee faculty members make no representations or warranties with respect to the accuracy or completeness of the contents of this document and specifically disclaim any implied warranties of merchantability or fitness for a particular purpose 2

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Syllabus with name of books ANALOG COMMUNICATION TECHNIQUES (3-1-0) Module-I : (12 Hours) SIGNALS AND SPECTRA:An Overview of Electronic Communication Systems, Signal and its Properties, Fourier Series Expansion and its Use, The Fourier Transform, Orthogonal Representation of Signal. RANDOM VARIABLES AND PROCESSES: Probability, Random variables, Useful Probability Density functions, Useful Properties and Certain Application Issues. AMPLITUDE MODULATION SYSTEMS: Need for Frequency translation, Amplitude Modulation(Double Side Band with Carrier DSB-C),Single Sideband Modulation(SSB) Other AM Techniques and Frequency Division Multiplexing ,Radio Transmitter and Receiver. Module-II : (12 Hours) ANGLE MODULATION: Angle Modulation, Tone Modulated FM Signal, Arbitrary Modulated FM signal, FM Modulators and Demodulators, Approximately Compatible SSB Systems. PULSE MODULATION AND DIGITAL TRANSMISSION OF ANALOG SIGNAL: Analog to Digital( Noisy Channel and Role of Repeater), Pulse Amplitude Modulation and Concept of Time division multiplexing ,Pulse Width Modulation and Pulse Position Modulation, Digital Representation of Analog Signal. Module-III : (14 Hours) MATHEMATICAL REPRESENTATION OF NOISE:Some Sources of Noise, Frequency-domain Representation of Noise ,Superposition of Noises, Linear Filtering of Noise. NOISE IN AMPLITUDE MODULATION SYSTEM : Framework for Amplitude Demodulation, Single Sideband Suppressed Carrier(SSB-SC), Double Sideband Suppressed Carrier(DSB-SC), Double Sideband With Carrier(DSB-C). NOISE IN FREQUENCY MODULATION SYSTEM : An FM Receiving System, Calculation of Signal to Noise Ratio, Comparison of FM and AM, Preemphasis and Deemphasis and SNR Improvement, Noise in Phase Modulation and Multiplexing Issues, Threshold in Frequency Modulation, Calculation of Threshold in an FM Discriminator, The FM Demodulator using Feedback(FMFB). Essential Reading: 1. H. Taub, D. L Schilling, G. Saha; Principles of Communication System, 3rd Edition; 2008, Tata McGraw Hill, India; ISBN: 0070648115. (Selected portions from chapters: Chapter-1,Chapter-2, Chapter-3, Chapter-4, Chapter-5, Chapter-7, Chapter-8, Chapter-9) Supplementary Reading: 1. Communication System Engineering,Second Edition by Masoud Salehi, John G. Proakis, ISBN: 0130950076 (paperback) 2. Analog Communication by Chandra Sekar, Oxford University Press. 3. Modern Digital and Analog Communication Systems, by B.P. Lathi, Oxford 3

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Module I: Signal & Spectra Definition of a signal: "A signal is a detectable physical quantity or impulse (as a voltage, current, or magnetic field strength) that varies with respect to time, space, temperature or any other independent variable or can be defined as a function x(t) of independent variable ‘ t’ by which messages or information about behaviour of a natural or artificial system can be conveyed" Electrical signals - time varying voltages and currents - in many cases have important properties that are necessary to be measured. Sometimes it is also justified to make any of these kinds of measurements.    Power in an audio signal - as one can test an audio amplifier's output ability Frequency - as one can use an AC tachometer to measure a motor's rpm. Amplitude – measurement of signal strength in a communication system. This includes the basic definition of signals. To easily understand signals & systems, we would visualize signals as simple mathematical functions. Classification of signals: 1. Continuous & Discrete Signals  4 Continuous signals & those defined over a set of real numbers(R) & discrete signals are those defined for discrete integers(I). For instance, a signal (a function) having the domain [0,10] is continuous & one having

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