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 )
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)Don't share as screenshot
UNIT-3
3. Pre emphasis and de emphasis
4.Rare
Noise temperature,bandwidth ,figure
UNIT-5
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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*These questions are expected for the exams This may or may not be asked for exams All the best.... from admin Santhosh
Thanks for your love and support guys keep supporting and share let the Engineers know about Us and leave a comment below for better improvements If there is any doubt feel free to ask me I will clear if I can or-else I will say some solutions ..get me through WhatsApp for instant updates ~$tuff$£ctorSYllabuS
Contact uS
*These questions are expected for the exams This may or may not be asked for exams
All the best.... from admin Santhosh
Thanks for your love and support guys keep supporting and share let the Engineers know about Us and leave a comment below for better improvements
If there is any doubt feel free to ask me I will clear if I can or-else I will say some solutions ..get me through WhatsApp for instant updates ~$tuff$£ctor 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