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Posted Date: 13 May 2008 Posted By: palaniappan Member Level: Silver
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2008 Anna University B.E Computer Science Analog and digital communication - Unit - IV question bank Question paper
UNIT IV - DIGITAL MODULATION
PART -A
1. What is digital transmission?
2. Define information capacity
3. What are the three most predominant modulation schemes used in digital radio systems?
4. Explain the relationship between bits per second and baud for FSK system
5. Define digital amplitude modulation/ ASK
6. What is the minimum bandwidth ,bit rate ,mark and space frequencies of an FSK system
7. Define PSK and CP-FSK
8. What is the bit rate and baud for a BPSK system
9. What is a constellation diagram
10. What is M-ary scheme
11. What is the BPS and baud for QPSK system
12. What is the significance of Q channel and I channel in QPSK modulator
13. define dibit and tribit
14. What is the minimum bandwidth required for QPSK
15. What is a coherent demodulator
16. What is the bit rate and baud for 8-PSK and 16-PSK system
17. Define QAM and Quad bit
18. What is the difference between PSK and QAM
19. Define bandwidth efficiency
20. define carrier recovery
21. What is the difference between PSK and differential PSK
22. What is the purpose of clock recovery circuit? When is it used?
23. What is the frequency deviation and modulation index of FSK?
24. What are the advantages of BPSK?
25. Draw the binary PSK and FSK modulated waveforms assuming a modulating bit stream 1011
26. Compare the bandwidth efficiency of BPSK and QPSK modulated signals
PART B
1. Explain ASK modulation scheme with neat block diagrams
2. Explain FSK system with neat block diagrams and discuss the bandwidth requirements of FSK signals
3. With neat diagram explain FSK transmitter and FSK receiver
4. Explain BPSK system(transmitter and receiver)
5. Explain QPSK system(transmitter and receiver)
6. Explain 8 –PSK system(transmitter and receiver)
7. Explain 8 –QAM System(transmitter and receiver)
8. Explain Squaring Loop and Costas Loop for carrier recovery
9. Explain Differential PSK with neat diagram
10. Explain the working of BPSK transmitter and receiver using balanced modulator. How M-ary encoding and modulation is achieved in PSK.Draw a QPSK transmitter block diagram and explain the working principle.
11. Derive the probability of symbol error Pe for a coherent binary FSK and show that Pe = ½ erfc(vEb/2No)
12. Compare the different digital modulation schemes with respect to bit rate, baud rate, number of symbols used and bandwidth requirements.
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