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The power efficiency of the M ary PSK decreases because of the _____

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The power efficiency of the M ary PSK decreases because of the _____

(a) Freely packed constellation

(b) Increment of bandwidth efficiency

(c) Fixed null bandwidth

(d) Densely packed constellation

This question was addressed to me during an online interview.

My question comes from Combined Linear and Constant Envelope Modulation Techniques topic in chapter Modulation Techniques for Mobile Radio of Wireless/Mobile

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Best answer
Correct choice is (d) Densely packed constellation

Best explanation: Bandwidth efficiency increases as the value of M increases. But at the same time, increasing M implies that the constellation is more densely packed. Hence the power efficiency or noise tolerance is decreased.

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