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Q: Phase-coherence vs phase-continuous

Discussion in 'Electronic Design' started by John S, Jan 5, 2013.

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  1. John S

    John S Guest

  2. John S

    John S Guest

  3. miso

    miso Guest

    If you are not continuous phase, you need more bandwidth. Noise is
    proportional to the square root of the bandwidth, so I can't see phase
    coherence being beneficial in performance. I suppose if you went GMSK
    and reduced the bandwidth, then your point is valid.
  4. miso

    miso Guest

    CPFSK eliminates the jumps, but the author is espousing the virtues of
    PCFSK, i.e. just the opposite.
  5. John S

    John S Guest

    Excellent point! I had not considered the use to two PLLs. Maybe at high
    data rates that would be important.

  6. John S

    John S Guest

    Yes, but how do you distinguish a frequency shift using two slow PLLs?
  7. SoothSayer

    SoothSayer Guest

    Very slowly, methodically, and carefully.

    Sub hertz sample rates. ;-) Hehehehehe!
  8. Les Cargill

    Les Cargill Guest

    Using a PLL to make a matched filter seems iffy. Couple
    of resonant filters and a comparator sounds better to my ear. 'Course,
    there's a lot of dance-management too...
  9. josephkk

    josephkk Guest

    Formal consistency check failed. Please resubmit.

  10. josephkk

    josephkk Guest

    I am fairly sure you disunderstand. Can you (or anybody here) explain the
    difference CPFSK and PCFSK clearly(; and the S/N effects)?

  11. josephkk

    josephkk Guest

    Just for grins can you set up a simulation to play with? I don't quite
    follow yet.

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