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The constellation of M-ary PSK is ____________ dimensional.

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The constellation of M-ary PSK is ____________ dimensional.

(a) One

(b) Does not exist

(c) Two

(d) Three

I have been asked this question in examination.

I would like to ask this question from Combined Linear and Constant Envelope Modulation Techniques topic in section Modulation Techniques for Mobile Radio of Wireless/Mobile

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Correct choice is (c) Two

Easiest explanation: The constellation of M-ary PSK is two dimensional. It is due to the presence of two basis signals. And the M-ary message points are equally spaced on a circle.

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