A QPSK signal consists of how many distinct phase states? (i) 2 (ii) 4

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Module 2: Digital Modulation

20242m

A QPSK signal consists of how many distinct phase states?
(i) 2
(ii) 4
(iii) 8
(iv) 16

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Answer

Correct Option: (ii) $4$

Explanation

QPSK (Quadrature PSK): $M=4$ , phases $0°,90°,180°,270°$ or $45°,135°,225°,315°$ , 2 bits/symbol ( $00,01,10,11$ ).

Final Answer

$4$ phase states → Option (ii).

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