UNIT-1. INTRODUCTION TO
COMMUNICATION SYSTEM
Introduction,Orientation Introduction to communication system, Need for modulation,
Amplitude modulation, Time domain and Frequency domain description, Power
relations in AM wave,, Square law modulator, Switching modulator, Detection of
AM waves, Square law detector, Envelope detector.
UNIT-2. DSB
MODULATION DSB-SC
modulation,
time domain and frequency domain description, Generation of DSB-SC waves,
Balanced Modulator, Ring Modulator, Coherent detection of DSB-SC Modulated
waves, COSTAS Loop, Radio transmitter, Classification, AM Transmitter block
diagram
UNIT- 3. SSB MODULATION
Frequency
domain description, Frequency discrimination method for generation of AM- SSB
Modulated wave, Time domain description, Phase discrimination method for
generating of AM SSB Modulated waves, Demodulation of SSB Waves, Vestigial side
band modulation, Generation of VSB modulated wave, Time domain description,
Envelop detection of VSB wave pulse carrier, Comparison of AM techniques,
Applications of different AM waves.
UNIT-4. ANGLE MODULATION CONCEPTS
Frequency
Modulation, Single tone frequency modulation, Spectrum Analysis of Sinusoidal
FM Wave, Narrow band FM, Wide band FM, Constant Average Power, Transmission
band width of FM wave, Generation of FM Waves, Comparison of AM & FM
UNIT-5 . ANGLE MODULATION METHODS
Generation of FM wave: Direct method,
Parametric variation method, varactor diode, Reactance modulator, Armstrong
method, Detection of FM waves, Balanced frequency discriminator, Zero crossing
detector, Phase locked loop, Foster seely discriminator, ratio detector, FM
transmitter block diagram.
UNIT-6. NOISE
Nose in DSB and SSB system, Nose in A M
system, Nose in angle modulated system, Threshold effect in Angle modulation
system, Pre-emphasis and De-emphasis.
UNIT-7. RECEIVERS
Receiver types, Tuned Radio Frequency
receivers, Super heterodyne receiver, RF section and characteristics, Frequency
changing and Tracking, Intermediate frequency, AGC, FM receiver, Comparison
with AM receiver, amplitude limiting.
UNIT-8. PULSE MODULATION
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