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QPSK is a composite of

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QPSK is a composite of

(a) Two BPSK

(b) Three BPSK

(c) Two FSK

(d) Two M-ary PSK

This question was posed to me in a national level competition.

This is a very interesting question from Bandwidth Efficiency Plane and Bandwidth Efficient Modulation topic in division Modulation and Coding Trade-off of Digital Communications

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Best answer
The correct choice is (a) Two BPSK

The best explanation: QPSK is effectively a composite of two BPSK signals transmitted on orthogonal components of the carrier.

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