How many different phases would a 4PSK modulated signal with

How many different phases would a 4-PSK modulated signal with the following constellation diagram have?

How many different phases would a 4-PSK modulated signal with the following constellation diagram have?

Solution

Offset quadrature phase-shift keying (OQPSK) is a variant of phase-shift keying modulation using 4 different values of the phase to transmit. It is sometimes called Staggered quadrature phase-shift keying (SQPSK).

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