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Homework Help: Matched filter vs. Incoherent detection

  1. May 25, 2012 #1
    I am having trouble seeing how a matched filter for FSK is any more "coherent" in its detection than an envelope detection incoherent FSK demodulator. The matched filter simply requires a precise sampling time at the output, however, surely so does the incoherent FSK demodulator?

    Matched filters do not require a locally-generated coherent (in phase and hence frequency lock) version of the mark and space signals like a correlation detector does, so why are they classed as coherent detection?


  2. jcsd
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