Subject : Communication Therory
Semester : Fourth sem
Subject Code : EC1252
UNIT 1 AMPLITUDE MODULATION SYSTEMS
Review of spectral characteristics of periodic and non-periodic signals – Generation and demodulation of AM, DSBSC, SSB and VSB signals – Comparison of amplitude modulation systems – Frequency translation – FDM – Non-linear distortion.
UNIT II ANGLE MODULATION SYSTEMS
Phase and frequency modulation – Single tone – Narrow band and wideband FM Transmission bandwidth – Generation and demodulation of FM signal.
UNIT III NOISE THEORY
Review of probability – Random variables and random process – Gaussian process Noise – Shot noise – Thermal noise and white noise – Narrow band noise – Noise temperature – Noise figure.
UNIT IV PERFORMANCE OF CW MODULATION SYSTEMS
Superheterodyne radio receiver and its characteristic – SNR – Noise in DSBSC systems using coherent detection – Noise in AM system using envelope detection FM system – FM threshold effect – Pre-emphasis and de-emphasis in FM – Comparison of performances.
UNIT V INFORMATION THEORY
Discrete messages and information content – Concept of amount of information –
Average information – Entropy – Information rate – Source coding to increase average information per bit – Shannon-fano coding – Huffman coding – Lempel-Ziv (LZ) coding – Shannon's theorem – Channel capacity – Bandwidth – S/N trade-off – Mutual information and channel capacity – Rate distortion theory – Lossy source coding.
Part A(2 marks)
2 X 10 = 20
Part B(16 marks)
16 X 5 = 80
1. Dennis Roddy and John Coolen., "Electronic Communication", 4th Edition,
2. Herbert Taub and Donald L Schilling., "Principles of Communication Systems",
3rd Edition, TMH, 2008.
1. Simon Haykin., "Communication Systems", 4th Edition, John Wiley and Sons,
2. Bruce Carlson., "Communication Systems", 3rd Edition, TMH, 1996.
3. Lathi, B. P., "Modern Digital and Analog Communication Systems", 3rd Edition,
Oxford Press, 2007.
4. John G. Proakis, Masoud Salehi., "Fundamentals of Communication Systems",
5th Edition, Pearson Education, 2006.
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