Phase Synchronisation Techniques

  1. Hello Everyone,

    I was wondering if anyone out there would know any kind of phase synchronisation techniques used in mobile/satellite communication.


    Thanks in advance

    With Regards,
    Max
     
  2. jcsd
  3. berkeman

    Staff: Mentor

    Welcome to the PF.

    Phase synchronization in relatively bening channels is done with a preamble, where the receiver is able to recognize a preamble pattern, and choose the zero phase angle in the preamble. Then it is the receiver's job to keep using that zero phase angle reference information as it decodes the rest of the transmission.

    But you asked specifically about mobile communication, which is definitely not a benign channel. With multipath issues and cell hand-off issues, determining the reference phase is challenging.

    I googled part of your title -- phase synchronisation techniques used in mobile communication, and got some very good hits. Try the same search, and see if you find what you are looking for. Let us know what you find... :smile:
     
  4. Thanks Berkeman for your reply. Yeah I did googled the title "Phase Synchronisation Techniques". After lots of research I came up with

    1. Phase Locked Loop.
    2. Closed Loop Control.

    Are those correct ?
     
  5. Baluncore

    Baluncore 2,514
    Science Advisor

    In general, those are possible techniques.
    I presume you are receiving a digital signal from a moving satellite. The technique to use will be determined by the modulation of the signal you are trying to demodulate. Can you identify the modulation used or maybe the signal you wish to detect ?
     
  6. Hey Baluncore, firstly thanks for your reply to my thread.

    Well i am just doing some research on "Phase Synchronisation Techniques" in Mobile or Satellite. I have been searching for some papers on IEEE papers but most of them come as Phase Syn for Power instead of Mobile/Satellite.

    Cheers
     
  7. Baluncore

    Baluncore 2,514
    Science Advisor

    Perhaps you would be better searching from a different direction.
    1. Compile a list of satellites.
    2. List the up/down links.
    3. Identify the modulation used.
    4. Identify the synchronisation solutions used.

    Modulation methods change as demodulator technology advances.
    Digital synchronisation and demodulation techniques are rapidly replacing analogue.
     
  8. oh Baluncore, That is very helpful. Thank you so much
     
  9. "Carrier Phase Synchronization using Phase lock loops" would that be a correct technique ?
     
  10. Baluncore

    Baluncore 2,514
    Science Advisor

    Yes, that would be the old analogue technique.
    “Synchronisation” of a reference oscillator to a received carrier is “phase locking”.

    Try this link for a start... www.radioeng.cz/fulltexts/2010/10_01_149_154.pdf‎

    I suggest you google “ synchronisation of qpsk ”
    BPSK and QPSK are common digital modulation techniques.
    Digital techniques/algorithms are used now for these signals.

    By using spread spectrum techniques and knowing the spreading sequence the receiver can lock to the spreading code. That is how GPS does it. That requires a correlator capable of detecting the phase error.
     
  11. Baluncore

    Baluncore 2,514
    Science Advisor

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