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Kvadraturmodulator (IQ-modulator)

Q (’in quadratuture’ sin(  C t) ). m1(t). cos(  C t) ) . I (’in phase’. m2(t). Kvadraturmodulator (IQ-modulator). Ideen är att kunna sända 2 meddelanden , säg m1(t) och m2(t) med samma bärfrekvens. Bärvågen delas upp i 2 komponenter fasförskjutna 90 0 ( /2).

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Kvadraturmodulator (IQ-modulator)

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  1. Q (’in quadratuture’ sin(Ct) ) m1(t) cos(Ct) ) I (’in phase’ m2(t) Kvadraturmodulator (IQ-modulator) Ideen är att kunna sända 2 meddelanden , säg m1(t) ochm2(t) med samma bärfrekvens. Bärvågen delas upp i 2 komponenter fasförskjutna 900 (/2). m1(t) och m2(t) AM-modulerar var sin komponent

  2. A D C B E A: Fyrkantvåg 1 Hz (50%) D: Demodulerad Fyrkantvåg B: Sinus 2.2 Hz E: Demodulerad sinus C: Utsänd signal

  3. Spektrum i C Förklara spektrums utseende ! Hur stor är bandbredden ?

  4. Spektrum i D Lågpassfiltret skär vid 10 Hz

  5. Spektrum i E

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