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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