 MORE IN Principles of Analog & Digital Comm.
MU Information Technology (Semester 3)
Principles of Analog & Digital Comm.
December 2015
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Solve any four:
1 (a) Explain pre-emphasis and De-emphasis.
5 M
1 (b) Explain the following (i) Shot noise, (ii) Equivalent Noise temperature.
5 M
1 (c) A single tone FM single is given by VFM (t)=10 sin (16 π×106 t+20 sin 2 π × 103 t)
Find
i) Maximum frequency deviation
ii) BW of FM by using Carson's rule.
5 M
1 (d) What are the drawbacks in DM system and how these drawbacks can overcome.
5 M
1 (e) Explain the need for modulation.
5 M

2 (a) Explain the basic principle, working of Transmitter and receiver and BPSK. Also draw the BPSK Waveform for the following binary signal 10110110.
10 M
2 (b) Draw the data formats (linecode) of any five for the given binary 10101101.
10 M

3 (a) Explain PWM generation and degeneration method.
10 M
3 (b) Describe PCM and also explain the PCM encoder and decoder with block diagram.
10 M

4 (a) Explain Foster Seeley discriminator and Compare the performance of Foster Seeley and Ratio detector.
10 M
4 (b) A sinusoidal carrier has an amplitude of 20v and a frequency of 200kHz. It is amplitude modulated by a sinusoidal voltage of amplitude 6v and frequency 1 kHz. Modulated voltage is developed across a 80Ω resistance.
i) Write the equation for the modulated wave.
ii) Determine the modulation index.
iii) Draw the spectrum of modulated wave.
iv) Calculate the total average power.
10 M

5 (a) Explain the generation and demodulation of SSBSC.
10 M
5 (b) State and prove the following properties of Fourier Traulform.
i) Time Shifting.
ii) Differentiation in Time domain.
10 M

6 (a) QPSK
5 M
6 (b) PCM-TDM
5 M
6 (c) Friss formula
5 M
6 (d) Image frequency and its rejection
5 M
6 (e) Sampling theorem.
5 M

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