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If carrier modulated by a digital bit stream, has one one of the possible phase of $0, 90, 180$ and $270$ degrees, then modulation called

  1. BPSK
  2. QPSK
  3. QAM
  4. MSK
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Answer is b) QPSK

This is the phase shift keying technique, in which the sine wave carrier takes four phase reversals such as 0°, 90°, 180°, and 270°.

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