QPSK phase shift

  1. What is phase shift of qpsk when symbol change occurs ?

    Can anybody explain please ?
     
  2. jcsd
  3. QPSK is a form of "coherent" modulation. In coherent modulation the receiver contains a reference clock that is frequency locked to the received signal. Data is encoded by changing the received signal's phase and amplitude relative to the reference clock. Phase shifts are illustrated in the attached picture.
     

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  4. sophiecentaur

    sophiecentaur 13,916
    Science Advisor
    Gold Member

    Did you look at Wikipedia? Have you any questions about their treatment of QPSK?
     
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