EC8491 Communication Theory Previous Year Question Paper Download

EC8491 Communication Theory Previous Year Question Paper


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

Amplitude Modulation- DSBSC, DSBFC, SSB, VSB – Modulation index, Spectra, Power relations and Bandwidth – AM Generation – Square law and Switching modulator, DSBSC Generation – Balanced and Ring Modulator, SSB Generation – Filter, Phase Shift and Third Methods, VSB Generation – Filter Method, Hilbert Transform, Pre-envelope & complex envelope –comparison of different AM techniques, Superheterodyne Receiver

UNIT II ANGLE MODULATION

Phase and frequency modulation, Narrow Band and Wide band FM – Modulation index, Spectra, Power relations and Transmission Bandwidth – FM modulation –Direct and Indirect methods, FM Demodulation – FM to AM conversion, FM Discriminator – PLL as FM Demodulator.

UNIT III RANDOM PROCESS 

Random variables, 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 – Noise figure, noise temperature and noise bandwidth – Noise in cascaded systems. Representation of Narrow band noise –In-phase and quadrature, Envelope and Phase – Noise performance analysis in AM & FM systems – Threshold effect, Pre-emphasis and de- emphasis for FM.

UNIT V SAMPLING & QUANTIZATION 

Low pass sampling – Aliasing- Signal Reconstruction-Quantization – Uniform & non-uniform
quantization – quantization noise – Logarithmic Companding –PAM, PPM, PWM, PCM – TDM, FDM.



Download EC8491 Communication Theory Previous Year Question Paper Regulation 2017 question paper

EC8491 Communication Theory Apr/May 2019 Question Paper

EC8491 Communication Theory Nov/Dec 2017 Question Paper



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