Digital modulation techniques

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Digital modulation techniques

  1. 1. Digital modulation techniques
  2. 2. Modulations systems
  3. 3. Channel capacity
  4. 4. Reasons for choosing encoding techniques
  5. 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. 6. Analog modulation
  7. 7. Digital modulation and demodulation
  8. 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. 9. Modulation
  10. 10. Modulation (1)
  11. 11. Digital modulation techniques
  12. 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. 13. FSK (Frequency shift keyring)
  14. 14. PSK (Phase shift keyring)

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