Biju Patnaik University of Technology 2008-7th Sem B.Tech (B Tech),ester communication engineering - Question Paper
B Tech(BPUT) seventh semester ques. paper of communication engineering
Total number of printed pages - 4 B, Tech
CPEC 5308
Seventh Semester Examination - 2008 COMMUNICATION ENGINEERING Full Marks-70
Time:3 Hours Answer Question No. 1 which is compulsory
IWL and any five from the rest.
\ The figures in jpe right-hand margin
indicate marks.
1, Answer the following questions : 2x10
{a} Give the Fourier transform of e-1, t > 0.
{b) A signal exhibits an amplitude swing of 3.5 V, It is quantized into 7 levels. Find the step size and hence the quantization error.
*Y*tCfTl'>
#) Y/h*ti*tfrGOGc fttpoct of PCM
f o) Wha! is1 the imputee rGscontt of ar ofll lowpttss Wtr* 9 S*irtcftirf
(f) GAabtocacfwTwfictf gwwing-iSSO signal from a OSBSC 5tgn.il
(g) Wrtte rwo advanifigios erf a F$K signal
(h) What tho practical valua ol the nose figure of a twopcxl network ? Wtiy ?
(0 Givo Iwo typical bands used in stftolito communication Why (he uplink and down link frequences are drftent ?
(j) How diversity 1$ useful m, a Cellular Communication System ?
CPEC 530* 2 Cantd.
Derve PSO ori a data stream Sketch* and siai*r sahqrH eahjfcs. 10
O&fvt} IN) Fouf*v transform of a tnangUar wftve o' amplitude A volt and duration T sec from a nimitar ffsetangular pufse by ustng ce<iam properties ol Fourth transfrofn. Sketch the spectrum Why (toes it look so 7 10
Dertve tn output signal power in a PCM transmission sysTom Hence fino out the signal \o quantization noee ratio. 02
(d) How the equivatent r>otse temperature of a system in cascade is calculated ? What is
i ts pracHcal j triplication, ? 5
(b) Discuss the radiation pattern of a dipole antenna. Explain how does a dipole act as an antenna ? 5
6. (a) Compare a LED and a LASER as optical
sources. 5
(b) Discuss the principle and operation of any photodetector. 5
7. (a) Write down the salient features of a
satellite communication system. Explain the working ofa typical transponder. 6
(b) What is fading ? What Is its cause? Write mummm
iwL;
two remedies fof it. 4
8. (a) Draw and explain any AM demodulator. 5
(b) Discuss any two types of antennas as used in a satellite communication system. 5
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