EC8491 Communication theory (CT)

 

EC8491 Communication theory (CT)

   Stuff Sector

Prepared by  
     S.Santhosh (Admin) 
Important questions 
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UNIT -1
1. Method of generating AM**
2.superhetrodyne receiver
3. Dsb-Sc AM and generating it
Rare
4. Hilbert transform
UNIT-2
1. Direct and indirect method of generating FM
2. Single tone FM (full exp and topic fully )
3. WBFM
4. Detection of FM using PLL (PLL as demod)
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UNIT-3
1. Different noise and it's effects ,merit of FM signal exp
 2. Autocorrelation finding problems
mean ,correlation , covariance,erogdicity**
3.guassian random process nd properties**
UNIT-4
1. Noise in FM receiver**
2. Noise ratio of AM SIGNAL**
3. Pre emphasis and de emphasis
4.Rare
 Noise temperature,bandwidth ,figure 
UNIT-5
1. Quantization**
2. Low pass sampling and signal reconstruction**
3. PWM,PCM ,Fdm

**Very important questions are bolded and may be asked based on this topic

PART-C

1.Compulsory Questions {a case study where the student will have to read and analyse the subject }
mostly asked from unit 4 and 2 (OR) a Problem given

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SYllabuS

 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
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