EC6402 COMMUNICATION THEORY
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Subject Informations :
University : Anna University
Department : B.E. ELECTRONICS AND COMMUNICATION ENGINEERING
Semester : 04 th sem
Year : 02 rd year
Regulation : R2013
Subject Code : EC6402
Subject Name : COMMUNICATION THEORY
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EC6402 COMMUNICATION THEORY | Important Questions | |
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OBJECTIVES:
To introduce the concepts of various analog modulations and their spectral characteristics.
To understand the properties of random process.
To know the effect of noise on communication systems.
To study the limits set by Information Theory.
UNIT I AMPLITUDE MODULATION
Generation and detection of AM wave-spectra-DSBSC, Hilbert Transform, Pre-envelope & complex
envelope – SSB and VSB –comparison -Superheterodyne Receiver.
UNIT II ANGLE MODULATION
Phase and frequency modulation-Narrow Band and Wind band FM – Spectrum – FM modulation and
demodulation – FM Discriminator- PLL as FM Demodulator – Transmission bandwidth.
UNIT III RANDOM PROCESS
Random variables, Central limit Theorem, Random Process, Stationary Processes, Mean, Correlation
& Covariance functions, Power Spectral Density, Ergodic Processes, Gaussian Process,
Transmission of a Random Process Through a LTI filter.
UNIT IV NOISE CHARACTERIZATION
Noise sources and types – Noise figure and noise temperature – Noise in cascaded systems. Narrow
band noise – PSD of in-phase and quadrature noise –Noise performance in AM systems – Noise
performance in FM systems – Pre-emphasis and de-emphasis – Capture effect, threshold effect.
UNIT V INFORMATION THEORY
Entropy – Discrete Memoryless channels – Channel Capacity -Hartley – Shannon law – Source coding
theorem – Huffman & Shannon – Fano codes
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