Biju Patnaik University of Technology 2008-6th Sem B.Tech (B Tech),ester commnucation engineering . - Question Paper
BPUT(B Tech),6th semester commnucation engineering ques. paper.
Totot numtwr of printed pages - B.Tecft
OPEC 5308
Siith Scfnfcstor Eiamination - 2008 COMMUNICATION ENGINEERING
Time ; 3 Hours
a ' Cix*;-'" Ur\ f **1 *s compulsory
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t Answer ito toflovvtng questions:
(a) Whai areperlofmance measures of a analog comnumwtioa system and a
digital communication system f
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(b) |
What is the objective of quantization ? What |
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2. (a) |
Compute and plot the spectrum of a signal |
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is quantization error ? |
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given by Acoscu0t. What does it signify ? | ||
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(c) |
What is the cause of intersymboi inter |
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ference ? What is its remedy ? |
(b) |
State and prove any two properties of | ||
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(d) |
Bring out how FM can be generated from |
Fourier transform. 4 | ||
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PM and vice versa. ' |
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3- (a) |
Compare an analog communication system | |
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(e) |
Draw the impulse response of an ideal low |
and a digital communication system from | ||
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pass filter. Is it a casual system ? |
at least four different points of view justify | |||
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(f) |
Give the signal space representation of a |
ing each of your statements. Give examples of typical systems in use. 8 | ||
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BFSK signal. What is the distance between |
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(b) |
What is a matched filter ? What is its | |||
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(g) |
the two points? What kind of noise is referred to while |
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importance ? 2 | |
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evaluating a communication system per |
4. (a) |
Establish why double sideband with carrier A | ||
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AM system is wasteful of power. o | ||||
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formance ? | ||||
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(h) |
Draw the spectrum of a DSB signal with |
(b) |
Explain any FM demodulator. 4 | |
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carrier. |
5. (a) |
Give circuits for generating and detecting | ||
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(i) |
What is the advantage of a parabolic |
a BFSK signal. Explain the operation of the c | ||
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reflector antenna over a dipole antenna ? |
circuits. D | |||
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Ci) |
Is the satellite communication system power limited or bandwidth limited ? Justify. |
(b] |
Define noise figure. What is its signifi- 4 cance ? | |
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CPEC 5308 2 Contd. |
CPEC |
5308 3 Rm | ||
6. fa) Draw the radiation pattern of a dipole
antenna and explain how the antenna operates. 4
(b) What are the advantages and disadvantages of radio wave propagation over ground and through ionosphere ? Give application of each type of radiation, 6
7. (a) Dtscuss a fiber optic communication s/s
tem. Explain the function of each block. 5 (b) Why are the uplink and the downfink frequencies different in a satellite communication system ? Discuss a transponder, 5
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8. (a) Explain the working principle and opera*
tion of the phoiodetectors. 5
(b) What are the sources of error in a PCM system ? Derive an expression for the SNR in a PCM system, What is its significance? . 5
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Attachment: |
| Earning: Approval pending. |
