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Posted By: CONFIDENCE IS THE COMPANION OF SUCCESS Member Level: Diamond Posted Date: 17 Apr 2008
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2007 Anna University B.E Electrical and Electronics Communication Theory Question paper
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EC 1301 – COMMUNICATION THEORY
( Common to B.E . ( PartTime)
Fourth Semester Regulation 2005 )
Time: Three hours Maximum: 100 marks
Answer ALL Questions
PART A – ( 10 X 2 = 20 marks)
1. Define amplitude modulation and modulation index.
2. What is the advantage of SSBSC
modulation over AM?
3. Differentiate phase modulation and frequency modulation.
4. Draw the block diagram of PLL.
5. What is white noise?
6. Define noise figure of a communication system.
C 3188
7. What is threshold effect with respect to noise?
8. What is the use of pre emphasis
and deemphasis
in FM systems?
9. Define entropy for a discrete memory less source.
10. State channel coding theorem.
PART B – (5 X 16 = 80 marks)
11. (a) (i) Draw the block diagram for the generation and demodulation of a VSB signal
and
explain the principle of operation.
(10)
(ii) What is frequency translation? Explain. (6)
11. (b) (i) Explain the functions of each block in the super heterodyne receiver. (9)
(ii) Define sensitivity , selectivity and image frequency of a receiver system. (7)
12. (a) (i) Explain the principle of indirect method of generating a wideband
FM
signal with a neat diagram.
(8)
(ii) Differentiate narrow band and wide band FM (8)
Or
12. (b) (i) Discuss the effects of non linearities in FM systems. (8)
(ii) How do you demodulate the Fm wave using frequency discriminator. (8)
13.(a) Discuss the types , causes and effects of the various forms of noise in the
receiver .
(10)
(b) Discuss the following:
(i) Noise equivalent bandwidth
(ii) Narrow band
noise
(iii) Noise temperature
(iv) Noise power Spectral Density
14. (a) (i) Define Hilbert Transform with a suitable example . (6)
(ii) Give the method of generation and detection of SSB waver. (10)
Or
(b) Compare the noise performance of AM and FM systems. (16)
15. (a) (i) Discuss Source Coding Theorem. (5)
(ii) Give the advantage and disadvantage of channel coding in detail. (6)
(iii) Discuss the data compaction (5)
Or
(b) (i) Write short notes on Differential entropy. (3)
(ii) Derive the channel capacity theorem. (7)
(iii) Discuss the implication of the information capacity theorem. (6)
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