1. Digital modulation techniques

2. Modulations systems

3. Channel capacity

4. Reasons for choosing encoding techniques

5. What is modulation ? Modulation = Adding information to a carrier signal The sine wave on which the characteristics of the information signal are modulated is called a carrier signal

6. Analog modulation

7. Digital modulation and demodulation

8. Signal characteristics that can be modified signal x(t) = A cos(2πft + Φ) A – amplitude f – frequency Φ – phase (initial angle of the sinusoidal function at its origin

9. Modulation

10. Modulation (1)

11. Digital modulation techniques

12. ASK ASK On-off keying (Amplitude Shift Keying) – frequency is kept constant, amplitude has 2 levels (for bit 1 and for bit 0) The binary sequence 0010110010

13. FSK (Frequency shift keyring)

14. PSK (Phase shift keyring)