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1. What is the difference between discrete system and digital system?
2. What is "baseband modulation"? What types of baseband modulation are there?
3. How does time division multiplexing work? What factors affect how many channels you can transmit?
4. What does "sample and hold" block do in PAM? How do you choose the frequency of pulse generator and sine wave and why?
5. Which is the theoretically optimal waveform for pulse shaping? Why?
6. What types of keying systems do you know? (Names + description for each)
7. What is the spectrum of ASK signal and why?
8. What is the function of raised cosine filters in our experiments? How does it affect the signal in both time domain and frequency domain?
9. What is Frequency Shift Keying? What is the difference from FM?
10. Write the expression of FSK. Use an example to explain FSK if information symbol is 2 bits. And what does the spectrum of the modulated signal look like?
11. In a digital system, how does the number of bits affect the transmission speed? What is the compromise involved?
12. What is the role of the integrator in the FSK implementation comparing to clock? How is the signal affected in time and frequency?
13. How many constants do we use in FSK? What parts of the FSK expression do they correspond to?
14. Give the basic structure of the PLL.
15. What are two easy implementations for the phase comparator? Briefly explain how one of them works.
16. How to make PLL work as an FM modulator?
17. Briefly design a PSK modulator with necessary blocks and explain your design.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M9854813

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