Roll No. LTI | [ 1] Total No. of Pages : 02
Total No. of Questions : 18
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B.Tech. (ECE) (2012 to 2017) (Sem.=5)
DIGITAL COMMUNICATION SYSTEMS
Subject Code : BTEC-501
M.Code : 70545
Time : 3 Hrs. Max. Marks : 60
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INSTRUCTIONS TO CANDIDATES :
- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt ANY FOUR questions.
- SECTION-C contains THREE questions carrying TEN marks each and students have to attempt ANY TWO questions.
SECTION-A
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Write briefly :
Q1. List advantages of digital communication system.
Q2. What is Aperture effect?
Q3. Write the basic difference between Bandpass transmission and Passband transmission.
Q4. Why do we use the Line coding formats?
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Q5. How Slope over load distortion and Granular noise are avoided in ADM?
Q6. Draw the power spectrum of QPSK, MSK and BFSK each on same scale.
Q7. What do you mean by:Non-linear quantization?
Q8. What is the relation between BER and SYMBOL error rate?
Q9. What do you mean by imperfect bit synchronization?
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Q10. What is CDMA?
SECTION-B
Q11. Why MSK is called shaped QPSK? For MSK, explain its expression and wave forms for the signal 11000111.
Q12. What are the draw backs of DM? How are these overcome by ADM?
Q13. Write a note on probability of error for PSK and Draw wave forms of PSK for the bit stream 101110001111.
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Q14. Explain coherent and non-coherent ASK detector in detail.
Q15. The probabilities of the five possible outcomes of an experiment are P1 :%, P2 :%, P3 :%, P4=Ds :%. Find the entropy and information rate if there are 16 outcomes per second.
SECTION-C
Q16. Apply the Shannon-Fano algorithm to the source with M = § emitting messages [X]= [A, B, C, D, E, F, G, H] having probabilities{P]= [1/2, 3/20, 3/20, 2/25, 2/25, 1/50, 1/100, 1/100]
Q17. Give comparison of DPCM and DM with standard PCM.
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Q18. Write note on any two of following
a) QPSK Receiver
b) FDMA and TDMA
c) Lampel-Ziv source coding algorithm with example
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.
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This download link is referred from the post: PTU B.Tech Question Papers 2020 December (All Branches)
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