06EC53 - ANALOG COMMUNICATION |
PART – A |
UNIT – I RANDOM PROCESS: |
Random variables: Several random variables.
Statistical averages: Function of Random variables, moments, Mean,
Correlation and Covariance function: Principles of autocorrelation function,
cross – correlation functions. Central limit theorem, Properties of Gaussian
process. |
UNIT – II AMPLITUDE MODULATION: |
Introduction, AM: Time-Domain
description, Frequency – Domain description. Generation of AM wave:
square law modulator, switching modulator. Detection of AM waves: square
law detector, envelop detector. Double side band suppressed carrier
modulation (DSBSC): Time-Domain description, Frequency-Domain
representation, Generation of DSBSC waves: balanced modulator, ring
modulator. Coherent detection of DSBSC modulated waves. Costas loop. |
UNIT – III SINGLE SIDE-BAND MODULATION (SSB): |
Quadrature carrier
multiplexing, Hilbert transform, properties of Hilbert transform, Preenvelope, Canonical representation of band pass signals, Single side-band
modulation, Frequency-Domain description of SSB wave, Time-Domain
description. Phase discrimination method for generating an SSB modulated
wave, Time-Domain description. Phase discrimination method for generating
an SSB modulated wave. Demodulation of SSB waves.
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UNIT – IV VESTIGIAL SIDE-BAND MODULATION (VSB): |
Frequency – Domain
description, Generation of VSB modulated wave, Time - Domain
description, Envelop detection of VSB wave plus carrier, Comparison of
amplitude modulation techniques, Frequency translation, Frequency division
multiplexing, Application: Radio broadcasting, AM radio.
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PART – B |
UNIT – V ANGLE MODULATION (FM)-I: |
Basic definitions, FM, narrow band FM,
wide band FM, transmission bandwidth of FM waves, generation of FM
waves: indirect FM and direct FM. |
UNIT – VI ANGLE MODULATION (FM)-II: |
Demodulation of FM waves, FM stereo
multiplexing, Phase-locked loop, Nonlinear model of the phase – locked
loop, Linear model of the phase – locked loop, Nonlinear effects in FM
systems.
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UNIT – VII NOISE: |
Introduction, shot noise, thermal noise, white noise, Noise
equivalent bandwidth, Narrow bandwidth, Noise Figure, Equivalent noise
temperature, cascade connection of two-port networks.
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UNIT – VIII NOISE IN CONTINUOUS WAVE MODULATION SYSTEMS: |
Introduction, Receiver model, Noise in DSB-SC receivers, Noise in SSB
receivers, Noise in AM receivers, Threshold effect, Noise in FM receivers,
FM threshold effect, Pre-emphasis and De-emphasis in FM,.
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REFERENCE |
TEXT BOOKS: |
11. Communication Systems, Simon Haykins, 3rd Edition, John
Willey, 1996.
2. An Introduction to Analog and Digital Communication, Simon
Haykins, John Wiley, 2003. |
Reference Books |
1. Modern digital and analog Communication systems B. P. Lathi,
3rd ed 2005 Oxford University press.2. Communication Systems, Harold P.E, Stern Samy and A
Mahmond, Pearson Edn, 2004.
3. Communication Systems: Singh and Sapre: Analog and digital
TMH 2nd , Ed 2007.
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