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In amplitude phase keying each phase vector is separated by

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In amplitude phase keying each phase vector is separated by

(a) 90

(b) 0

(c) 45

(d) 180

The question was posed to me at a job interview.

I need to ask this question from Digital Bandpass Modulation Techniques topic in division Bandpass Modulation and Detection of Digital Communications

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Correct option is (c) 45

Explanation: The combination of ASK and PSK is called as APK. In APK each vector is separated by 45.

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