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 V

Find

i) Maximum frequency deviation

ii) BW of FM by using Carson's rule.

_{FM (t)}=10 sin (16 π×10^{6}t+20 sin 2 π × 10^{3}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.

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.

i) Time Shifting.

ii) Differentiation in Time domain.

10 M

Answer any four:

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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