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Modulations

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Modulations. Mohamed Mokdad Ecole d’Ingénieurs de Bienne. Agenda. Signal Sampling Compression Transmission Modulation Modulations schemes. Analog signal. Sampling pulses. Signal samples. Spectral presentation. Quantification error. Line codes. Serial Voltage ± 12V TTL

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Modulations

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  1. Modulations Mohamed Mokdad Ecole d’Ingénieurs de Bienne

  2. Agenda • Signal • Sampling • Compression • Transmission • Modulation • Modulations schemes

  3. Analog signal

  4. Sampling pulses

  5. Signal samples

  6. Spectral presentation

  7. Quantification error

  8. Line codes • Serial • Voltage ± 12V • TTL • Voltage 0-5V • NRZ • Voltage • Manchester • Transition coding

  9. Line coding examples

  10. AM Modulation OOK

  11. AM Modulation ASK

  12. FM Modulation

  13. Phase Modulation PSK

  14. PSK-2 and PSK-4

  15. AM + PSK Modulation

  16. T1 R1 T2 MUX DMUX R2 T3 R3 Multiplex xDMA

  17. TDM - Multiplex T1 R1 1 2 3 1 2 3 T2 MUX DMUX R2 T3 R3 Time

  18. FDM - Multiplex T1 R1 1 2 3 1 2 3 T2 MUX DMUX R2 T3 R3 Frequency

  19. CDM - Multiplex T1 R1 1 2 3 1 2 3 T2 MUX DMUX R2 T3 R3 Codes

  20. xDMA - Multilexing

  21. CDMA details

  22. Chips to 1 and to 0

  23. S • C = ? • S = A + B + C • S • C = A • C + B • C + C • C • S • C = 0 + 0 + 1 • Orthogonality is importantfor codes selection.

  24. FFT & Attenuation

  25. Real example - 1

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