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Which of the following is not a detection technique used for detection of π/4 QPSK signals?

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Which of the following is not a detection technique used for detection of π/4 QPSK signals?

(a) Baseband differential detection

(b) IF differential detection

(c) FM discriminator detection

(d) Envelope detection

The question was posed to me during a job interview.

Query is from Linear Modulation Techniques topic in chapter Modulation Techniques for Mobile Radio of Wireless/Mobile

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Correct answer is (d) Envelope detection

The explanation: There are various types of detection techniques used for the detection of π/4 QPSK signals. They include baseband differential detection, IF differential detection and FM discriminator detection.

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