STUPIDSID
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)=D4+D3+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
More question papers from Communication Engineering