UGC NET CSE | June 2011 | Part 2 | Question: 27

Question

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

• A. BPSK
• B. QPSK
• C. QAM
• D. MSK

Comments

FOR MORE INFO ABOUT ALL OPTs:https://www.tutorialspoint.com/digital_communication/digital_communication_phase_shift_keying.htm

Answer 1

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°.

Answer 2

Ans: B

ref: https://en.wikipedia.org/wiki/Phase-shift_keying