November 2010 BE 411307-412307-512307-6C0046 Principles of Communication Engineering Sathyabama University

Register Number

                               

SATHYABAMA UNIVERSITY

(Established under section 3 of UGC Act, 1956)

Course & Branch: B.E/B.Tech-CSE/IT

Title of the Paper: Principles of Communication Engineering

Max. Marks: 80

Sub. Code: 411307-412307-512307-6C0046         Time: 3 Hours

Date: 14/11/2010                                                    Session: FN

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PART - A                (10 X 2 = 20)

Answer ALL the Questions

1.     Give the need for modulation 

2.     What is the advantage of SSB-SC modulation over AM?

3.     Differentiate phase modulation and frequency modulation.

4.     What is frequency deviation in FM?

5.     State Low pass sampling theorem

6.     What are the two limitations of Delta Modulation?

7.     What is meant by ISI?

8.     Compare the probability of error of PSK with that of FSK.

9.     Define Entropy.

10.   What is meant by syndrome of a linear block code?

PART – B                       (5 x 12 = 60)

Answer All the Questions

11.   Draw the block diagram for the generation and detection of a VSB signal and explain the principle of operation.

(or)

12.   What are the advantages of Super heterodyne receiver over TRF receiver? With a neat block diagram explain the operation of AM Super heterodyne receiver.

       

13.   Explain the method of generating FM wave and derive the expression for frequency spectrum.

(or)

14.   With neat block diagram explain in detail about Foster Seeley discriminator.

15.   (a) With supporting derivation prove that if a signal contains no frequencies higher than W Hz, it may be reconstructed from its samples at sequence of points spaced 1/2w seconds apart.       (8)

        (b) With neat diagram explain TDM.                                    (4)

(or)

16.   With neat block diagram, explain in detail about PCM.

              

17.   Draw the block diagram of correlation receiver for detecting transmitted signals with ‘m’ possible signals and explain the decision rule used.

(or)

18.   With necessary equations and signal space diagram, explain the QPSK system and obtain the probability of error for the same.

19.   Draw the block diagram of DS-Spread Spectrum transmitter and receiver and explain the function performed by each block.

(or)

20.   A discrete memory less channel has the following alphabet with the probability of occurrence      

Symbol	S0	S1	S2	S3	S4	S5	S6
Prob	0.125	0.0625	0.25	0.0625	0.125	0.125	0.25

Generate Shannon-Fano coding and find h.

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