1(a)
State and prove sampling Theorem

5 M

1(b)
Draw and explain the block diagram of a digital communication system.

5 M

1(c)
Explain how FSK can be generated using ASK.

5 M

1(d)
Explain the need for modulation in a communication system.

5 M

2(a)
Generate Huffman's code for the five symbols of a source having probabilities: 0.5, 0.25, 0.125, 0.0625, and 0.0625. Find entropy of the source, average code word length and efficiency of the code.

10 M

2(b)
Explain with neat block diagram the working of a super- heterodyne AM receiver.

10 M

3(a)
Draw the spectrum of an AM waveform if the modulating signal is m(t)=(cos 2000πt+0.5cos 4000πt) and carrier is c(t) = 1.5 cos(1000πt). Calculate total power and power of sidebands.

10 M

3(b)
What is a balanced modulator? With the help of waveforms, prove thet the carrier is getting suppressed.

10 M

4(a)
A message 101101 is to be transmitted in cyclic code with a generator polynomial G(D)=D

^{4}+D^{3}+1. Obtain the transmitted code word. How many check bits does the encoded message contain? Draw the encoding arrangement for the same.
10 M

4(b)
Explain Delta modulation transmitter and receiver with the help of a neat block diagram. What is slope overload and hunting error?

10 M

5(a)
Explain the functioning of Foster-Seeley discriminator with the help of neat circuit diagram and phasor diagram.

10 M

5(b)
State and prove the properties of Fourier Transform.

10 M

Write short note on any three:

6(a)
OFC

7 M

6(b)
Quantization process.

7 M

6(c)
Shannon-Hartley Theorem.

7 M

6(d)
Pre-Emphasis and De-Emphasis.

7 M

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