# EC6402 COMMUNICATION THEORY | Important Questions | Question bank | Syllabus | Model and Previous Question papers | Download PDF

## EC6402 COMMUNICATION THEORY

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

EC6402 COMMUNICATION THEORY – SYLLABUS – R- 2013

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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