1. Frequency Shift Keying (FSK) & Phase Shift Keying (PSK)
Lecture 6:
Frequency Shift Keying (FSK) & Phase Shift Keying (PSK)
1nd semester
By: Adal ALashban

2. Outline - FSK (Frequency Shift Keying). - Digital Modulation (FSK).
- PSK (Phase Shift Keying).
- Digital Modulation Summary.

3. FSK (Frequency Shift Keying)
- The frequency of the carrier signal is varied to represent binary 1 or 0.
- Both peak amplitude and phase remain constant while the frequency changes.
- The frequency of the signal during each bit duration is constant, and its value depends on the bit (0 or 1).

4. Digital Modulation (FSK)
- Frequency Shift Keying (FSK):
- 0 and 1 represented by different frequencies.
- Switch between two oscillators accordingly.
- Twice the bandwidth but more resilient to error.

5. PSK (Phase Shift Keying)
- The phase of the carrier signal is varied to represent binary 1 or 0.
- Both peak amplitude and frequency remain constant while the phase changes.
- The phase of the signal during each bit duration is constant, and its value depends on the bit (0 or 1).

6. Digital Modulation Summary
- Amplitude Shift Keying (ASK):
1- Very simple.
2- Low bandwidth requirements.
3- Very susceptible to interference.
- Frequency Shift Keying (FSK):
1- Needs larger bandwidth.
2- More error resilience than AM.
- Phase Shift Keying (PSK):
1- More complex.
2- Robust against interference.
- Other modulation schemes are mostly complex variants of ASK, FSK, or PSK…

7. Digital Modulation Summary

8. Any Questions ?