# Principle Of Communication 3rd AM11 IT2202

B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2011
Third Semester
Information Technology
IT 2202 - PRINCIPLES OF COMMUNICATION
(Regulation 2008)

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PART A — (10 × 2 = 20 marks)

1. Define angle modulation.
2. What is percent modulation?
4. State sampling theorem.
5. Compare PCM and DM.
6. Mention two applications of FSK.
7. Define processing gain.
8. What is the difference of multiplexing and multiple accessing?
9. State Keplers law.
10. What are the different types of losses in optical fiber?

PART B — (5 × 16 = 80 marks)

11. (a) (i) Compare AM, FM and PM. (12)
(ii) Write short notes on AM power distribution. (4)
Or
(b) (i) When the modulating frequency in a FM system is 400 Hz and the modulating voltage is 2.4 V. The modulating index is 60. Calculate the maximum frequency deviation. What is the modulation index when modulation frequency is reduced to 250 Hz and modulating voltage is raised to 3.2 V (6)
(ii) (1) Define modulation index of AM, FM and PM. (6)
(2) Define frequency deviation and phase deviation. (4)

12. (a) (i) Explain about the Shannon limit for information capacity. (8)
(ii) Define bit rate, baud rate and bandwidth consideration of FSK. (6)
(iii) Define digital amplitude modulation. (2)
Or
(ii) Describe FSK modulator with a neat diagram. (8)

13. (a) Write short notes on :
(ii) Differential pulse code modulation. (6)
(iii) Inter-symbol interference. (4)
Or
(b) (i) Explain the quantization process in PCM. (6)
(ii) Describe the delta modulation system with necessary diagram. (10)

14. (a) (i) Write short notes on direct sequence spread spectrum with coherent BPSK (10)
(ii) Explain about the Pseudorandom sequence. (6)
(b) Explain in detail about the source coding of speech for wireless communications. (16)

15. (a) With a neat diagram, explain briefly about the basic satellite communication systems. Also discuss its applications. (16)
Or
(b) (i) What are the types of optical fiber? Explain. (8)
(ii) Explain briefly about the sources of optical fiber. (8)