STUPIDSID
1(a)
For the base band signal m(t)=2cos1000t+cos2000t, sketch the spectrum of m(t).
2 M
1(b)
What do you understand by causal and non-causal system?
2 M
1(c)
Write the explain Parseval's theorem.
3 M
Solve any one question from Q.1(d) & Q.1(e)
1(d)
Write the difference between frequency domain and time domain representation of signals. Use suitable examples.
7 M
1(e)
What do you understand by impulse response of a system? Difference between cross-correlation and auto-correlation.
7 M
2(a)
Why modulation is needed for the transmission of the signals?
2 M
2(b)
What are the merits of frequency modulation?
2 M
2(c)
Explain BNFM and WBFM in Brief.
3 M
Solve any one question from Q.2(d) & Q.2(e)
2(d)
Compare the following amplitude modulation system DSB with carrier, DSB/SC, SSB/SC and VSB.
7 M
2(e)
What is Phase modulation? How it is related to frequency modulation. Show that a vector can be used to generate a FM signal.
7 M
3(a)
Write and explain sampling theorem.
2 M
3(b)
What is multiplexing? Why it is needed?
2 M
3(c)
Explain the terms quantization process, quantization error and noise figure.
3 M
Solve any one question from Q.3(d) & Q.3(e)
3(d)
Differentiate between the delta modulation and adaptive delta modulation techniques. Explain the importance of companding.
7 M
3(e)
Define and describe Pulse Position Modulation (PPM) and explain how PPM is derived from Pulse Width Modulation (PWM)
7 M
4(a)
What do you understand by digital modulation techniques?
2 M
4(b)
What are functions of a repeater in a PCM system?
2 M
4(c)
Draw the following data formats for the bit stream 11001011 polar NRZ, polar RZ, unipolar R/Z, AMI, Manchester.
3 M
Solve any one question from Q.4(d) & Q.4(e)
4(d)
What are advantages of DPSK? The bit stream if 11100110001 is to be transmitted phase sequence and find out the defected output.
7 M
4(e)
Draw the block diagram of QPSK system with that of BPSK system.
7 M
5(a)
Describe minimum Hamming distance in brief.
2 M
5(b)
Write and explain Shannon theorem.
2 M
5(c)
Does Shannon-Hartley theorem tells about trade off between signal to noise ratio and bandwidth?Explain.
3 M
Solve any one question from Q.5(d) & Q.5(e)
5(d)
Write and explain Shannon-Fano coding method using suitable example.
7 M
5(e)
Write short note on Linear block codes, cyclic codes.
7 M
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