Digital modulation techniques
Modulations systems
Channel capacity
Reasons for choosing encodingtechniques
What is modulation ?• Modulation = Adding information to a carrier signal• The sine wave on which the characteristics of t...
Analog modulation
Digital modulation anddemodulation
Signal characteristics that can bemodifiedsignal x(t) = A cos(2πft + Φ)• A – amplitude• f – frequency• Φ – phase (initial ...
Modulation
Modulation (1)
Digital modulation techniques
ASK• ASK On-off keying (Amplitude Shift Keying) –frequency is kept constant, amplitude has 2 levels (for bit1 and for bit ...
FSK (Frequency shift keyring)
PSK (Phase shift keyring)
Digital modulation techniques
Digital modulation techniques
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Digital modulation techniques

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Digital Modulation

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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 encodingtechniques
  5. 5. What is modulation ?• Modulation = Adding information to a carrier signal• The sine wave on which the characteristics of theinformation signal are modulated is called a carrier signal
  6. 6. Analog modulation
  7. 7. Digital modulation anddemodulation
  8. 8. Signal characteristics that can bemodifiedsignal x(t) = A cos(2πft + Φ)• A – amplitude• f – frequency• Φ – phase (initial angle of the sinusoidal function at itsorigin
  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 bit1 and for bit 0)The binary sequence 0010110010
  13. 13. FSK (Frequency shift keyring)
  14. 14. PSK (Phase shift keyring)

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