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Phase shift


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Phase shift

  1. 1. PHASE SHIFT BYMuhammad Uzair Rasheed 2009-CPE-03 UCE&T BZU MULTAN
  2. 2. PHASE MODULATION• What is phase modulation?• PSK(Phase shift keying)• MSK(minimum shift keying)• GMSK(Gaussian shift keying)
  3. 3. What is phase modulation?• Phase modulation is a form of modulation that represents information as variation in the instantaneous phase of a carrier wave.• Phase modulation(PM) is integral of frequency modulation(FM)
  4. 4. PSK(Phase shift keying)• In Phase shift keying there are defined states and points that are used for signaling the data bits
  5. 5. PSK problems• Receiver cannot know the exact phase of the transmitted signal to determine whether it is marked or spaced condition even if the transmitter and receiver clocks were accurately linked.• To overcome this problem making the change in phase=1 and no phase change=0
  6. 6. MSK(minimum shift keying)• Continuous phase shifting technique
  7. 7. GMSK(Gaussian shift keying)• Special form of MSK