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Principles Of Communication ND09 IT2202

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Anna University 2009
B.Tech Information Technology(IT)
IT 2202-Principles Of Communication
3rd Semester - Question Paper
Regulation 2008



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1. Define amplitude modulation.
2. What is modulation index?
3. Why is ASK called as ON-OFF keying ?
4. What is the difference between QASK and QPSK ?
5. Define sampling rate.
6. What is ISI ?
7. Define Pseudo noise sequence.
8. What are the different types of multiple access techniques ?
9. Define Kepler's three laws of planetary motion.
10. What are the losses encountered by optical fiber ?


11. (a) (i)Write short notes on
(1) AM voltage distribution. (4)
(2) AM power distribution. (4)
(ii) An audio frequency signal 10sin2p*500t is used to amplitude modulate a carrier of 50 sin2p*10^5t.Calculate.
(1) Modulation index. (2)
(2)Side band frequencies. (2)
(3)BW required. (2)
(4)Total power delivered to the load of 600O. (2)
(b) (i)Compare FM and AM.(12)
(ii) The phase deviation constant in a phase modulation system is K=0.01rad/v.Calculate the maximum phase deviation when the modulating signal of 10V is applied. (4)

12. (a) (i)Explain the principle of FSK transmitter and receiver (10)
(ii)Write short note on spectrum and bandwidth of FSK. (6)
(b) (i)Compare the various types of digital modulation techniques. (8)
(ii)Explain the eye pattern in base band digital transmission with neat diagram. (8)

13. (a) (i)Explain the elements of PCM system with a neat block diagram. (12)
(ii)What is companding ? (4)
(b) (i)Find the signal amplitude for minimum quantization error in a delta modulation system if step size is 1 volt having repetition period 1 ms.The information signal operates at 100Hz. (4)
(ii) Describe the operations of DPCM system with relevant diagram. (12)

14. (a) (i)Write short notes on Frequency hop spread spectrum. (10)
(ii)Explain the applications of spread spectrum techniques. (6)
(b) (i)Give a detailed account of multiple access techniques. (10)
(ii)Compare TDMA and CDMA. (6)

15. (a) (i)Discuss briefly the basic satellite communication system . (8)
(ii)Write short notes on LEO and GEO orbits. (8)
(b) Enumerate the elements of an optical fiber transmission link. (16)