6. 4 Modern Communication Systems
Third Year
Part III Group A Sixth
Semester Subject
Code:
Unit - 1
Modulation – Need for modulation
– Amplitude modulation – Frequency spectrum – Power relation – Detection of AM
waves SSB generation detection – VSB – AM transmitters – Block Diagram – High
level & Low level transmitters.
Unit - 2
Angle modulation – Principle of
frequency and phase modulation – Relation between FM and PM waves band width of
FM – Narrow and wide band FM – Single tone and multi tone FM – Generation of FM
waves – Direct and indirect methods – Detection of FM waves – FM transmitters
block diagram – Superheterodine receivers – Choice of IF and oscillator
frequency – Tracking – AGC – AFC – Receiver characteristics
Unit - 3
Phase modulation system –
Sampling theorem- pulse amplitude modulation – Pulse time modulation –
Generation of PWM and PPM PCM – Quantization – Encoder and Decoder – TDM and
FDM – Digital modulation techniques – ASK, FSK and PSK
Unit - 4
(Block diagram approach)Microwave
communication – Line of sight – Over the Horizon and Troposcatter links –
Satellite communication – Domestic satellite system – Mobile Communication –
Cellular mobile concepts- Radar: Basic Radar system – Radar range equation –
Pulsed radar system
Unit – 5
(Block diagram approach) Fiber
optical communication : Need – Principles of optical communication –
Transmissions in fiber – optical fiber communication system – Optical light
sources – Photo detectors – Advantages - Television Engineering: Basic
principles – Camera tubes – Bandwidth considerations – Generation of Composite
Video – Monochrome and colour transmitters – Picture tubes – HDTV – Flat screen
TV.
TEXT BOOKS:
1. G.Kennedy,
Electronic communication System, McGraw Hill. 1989.
REFERENCE BOOKS:
1. SIMON
HAYKINS: Communication systems, 2/e, John Wiley.
2. D.ROODY
and J.COOLEN : Electronic
communication, 4/e, Prentice Hall of India, 1991
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