Question Paper: Principles of Analog & Digital Comm. Question Paper - May 2016 - Information Technology (Semester 3) - Mumbai University (MU)
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## Principles of Analog & Digital Comm. - May 2016

### MU Information Technology (Semester 3)

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) State the advantages of digital communication over analog communication. Justify each point. 5 marks

1(b) Define the following terms
(i) Noise figure
(ii) Noise temperature
(iii) Noise bandwidth
(iv) Noise voltage
(v) Modulation.
5 marks

1(c) Compare pulse code modulation and delta modulation. 5 marks

1(d) Explain in short pre-emphasis and De-emphasis. 5 marks

1(e) What is BPSK signal. Draw the BPSK signal for the following binary signal 10111010. 5 marks

2(a) Define signal to noise ratio. Explain the effect of cascade connection on a signal to noise ratio. An amplifier with 10dB noise figure and 4 dB power gain is cascaded with a second amplifier which has a 10dB power gain. What is overall noise figure and power gain. 5 marks

2(b) State and prove the following properties of Fourier transform with example
(i) Time shifting
(ii) Convolution in time domain
5 marks

3(a) An amplitude modulated waveform has a form x(t)=[10(1+0.6 cos 2000 &pi 5 marks

3(b) What are the limitations of TRF receiver. Explain how these limitations are avoided using superheterodyne receiver. 5 marks

4(a) With the help of neat circuit diagram and phasor diagram explain the working of Foster Seelay discriminator. 5 marks

4(b) What is multiplexing in communication system. Draw and explain in brief the transmitter and receiver of FDM. 5 marks

5(a) State and prove sampling theorem for low pass band limited signal. 5 marks

5(b) Draw the block diagram of PWM generator. Explain the working giving waveforms at the output of each block. 5 marks

6(a) Explain slop overload error and hunting error in Delta modulation. Derive the condition to avoid slop overload distortion. 5 marks

6(b) Explain the generation and detection of FSK signal. 5 marks

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