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10000EE401122002

With the help of suitable circuit arrangement and relevant characteristics
explain the development of SSB generation using balanced modulator.
Explain the effects of the image frequency and method of image frequency
rejection.
PART C
Answer any two full questions, each carries 10 marks.

With the help of relevant sketches explain the essential components of
composite video signal of a monochrome TV.
Mention any three specific advantages of HDTV system. Explain how these
features can be achieved.
With suitable sketches explain the role of low pass filter in the demodulation of
pulse amplitude modulated signals.
Mention any three modifications to improve the performance of PCM systems.
Justify your suggestions.
With suitable sketches explain any three disadvantages of the following:

i) Pulse width modulation scheme,

ii) Duplexer mode in RADAR systems,

iii) Cable TV systems

PART D
Answer any two full questions, each carries 10 marks.

Mention any three disadvantages of FDMA systems. Explain how these are
rectified in other MA systems?
Explain any four advantages of fiber optic cables over coaxial cables for
improved performance of the communication system.
Identify any three features of WiFi and explain how does it benefit for wireless
applications.
With suitable sketches explain the reasons for adjacent channel interferences.
How can you minimise them?
Explain with suitable sketches how do the following concepts improve the
performance of communication systems.

i) Zig Bee

ii) Cell sectoring

iii) Guard band in FDMA systems

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