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Understanding Digital Modulation Techniques and Channel Capacity

Learn about digital modulation techniques such as ASK, FSK, and PSK, and how signal characteristics like amplitude, frequency, and phase are modified. Discover the reasons for choosing encoding techniques and explore the basics of modulation systems.

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Understanding Digital Modulation Techniques and Channel Capacity

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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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