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Digital modulation techniques

Digital modulation techniques. Modulations systems. Channel capacity. Reasons for choosing encoding techniques. What is modulation ?. Modulation = Adding information to a carrier signal

gwendolyn-hoffman
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Digital modulation techniques

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  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)

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