EC 2252 COMMUNICATION THEORY Lecture Notes for ECE - Fourth (4th) Semester ...posted by R.Anirudhan
EC2252 Lecture Notes
UNIT I 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; Guassian 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 and its FM
system; FM threshold effect; Pre-emphasis and De-emphasis in FM; Comparison of
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.
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