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Telekommunikation F5 Forts. Digital Modulation

Telekommunikation F5 Forts. Digital Modulation. Q. I. Viktiga faktorer. Tillgänglig bandbredd, B Tillgänglig effekt, P Störningsnivåer, N * Brus * Fading (fasvridning, dämpning). Trender. TDMA,CDMA Multiplex- metoder. BPSK,FSK QAM,MSK Digitala system. AM, FM Analoga system.

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Telekommunikation F5 Forts. Digital Modulation

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  1. Telekommunikation F5 Forts. Digital Modulation F5_be_D2

  2. F5_be_D2

  3. Q I F5_be_D2

  4. Viktiga faktorer • Tillgänglig bandbredd, B • Tillgänglig effekt, P • Störningsnivåer, N * Brus * Fading (fasvridning, dämpning) F5_be_D2

  5. Trender TDMA,CDMA Multiplex- metoder BPSK,FSK QAM,MSK Digitala system AM, FM Analoga system F5_be_D2

  6. 01 11 00 10 Symbolavstånd Exempel 1 F5_be_D2

  7. Fassprång ? 1 1 1 0 Dibit 1 Dibit 2 Tidsplanet F5_be_D2

  8. Huvudlob med Bredden = 2/Ts= 1/Tbit=fbit ( Ts = symboltid ) 1/Ts 1/Ts Frekvensplanet F5_be_D2

  9. Indata Filtrerade indata Exempel 2 F5_be_D2

  10. Spektrum OBS Basbandet, Ingen RF-modulering Indata Filtrerade indata F5_be_D2

  11. Q I Symbolavstånd Exempel 2, 64 QAM F5_be_D2

  12. SYSTEM Bandbredd 6 MHz Datahastighet 31.2 Mbit/s Symbolhastighet 31.2/6 = 5.2 Msymboler/s Effektivitet 5.2*106 / 6*106 c:a 0.9 Symboler/Hz Eftersom varje symbol representerar 6 bitar blir Effektivitet c:a 0.9*6=5.2 Bitar/Hz Exempel 2, forts F5_be_D2

  13. Bit/s/Hz (Riktvärden) F5_be_D2

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