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CDMA mobile communication Raf Appeltans Niels Thijsen.

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Presentation on theme: "CDMA mobile communication Raf Appeltans Niels Thijsen."— Presentation transcript:

1 CDMA mobile communication Raf Appeltans Niels Thijsen

2 Overzicht MA-Technieken MA-Technieken Review Review DS-CDMA DS-CDMA MC-CDMA MC-CDMA Spectra Spectra Simulaties Simulaties Conclusies Conclusies Q & A Q & A

3 Review Multiple Acces Multiple Acces TDMA TDMA FDMA FDMA CDMA CDMA DS-CDMA DS-CDMA MC-CDMA MC-CDMA

4 DS-CDMA DS-CDMA Transmitter

5 DS-CDMA DS-CDMA Receiver – AWGN Channel

6 MC-CDMA MC-CDMA Transmitter

7 MC-CDMA equaliserdespreader H* |H|² MC-CDMA Receiver

8 Spectra

9 Overzicht MA-Technieken MA-Technieken Simulaties Simulaties AWGN AWGN Multipath Multipath Conclusies Conclusies Q & A Q & A

10 Simulaties AWGN Channel

11 Multipath Channel

12 Simulaties DS-CDMA – AWGN + Multipath

13 Rake Receiver

14 Simulaties DS-CDMA – AWGN + Multipath - Rake receiver

15 Simulaties DS-CDMA – AWGN + Multipath-channel - Rake receiver Multiple users

16 MC-CDMA

17 Simulaties MC-CDMA - AWGN + Multipath Channel

18 Conclusions Rake receiver te statisch Rake receiver te statisch Equalising bij MC niet goed genoeg Equalising bij MC niet goed genoeg Bij meerdere users steeds slechter Bij meerdere users steeds slechter CDMA links hebben nood aan codering CDMA links hebben nood aan codering (i.e. convolution codes ) Multi-user detection Multi-user detection

19 Q & A

20 User Interference DOWN-link DOWN-link Linear multi-user detection Linear multi-user detection UP-link UP-link Non-linear multi-user detection Non-linear multi-user detection

21 User Interference Interference Cancellers Interference Cancellers Linear Linear Channel matched Channel matched MMSE MMSE Non-linear Non-linear Successive IC Successive IC Parallel IC Parallel IC Partial Parallel IC Partial Parallel IC MMSE + PIC MMSE + PIC


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