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In comparison to M-ary PSK, M-ary QAM bandwidth efficiency is _____ and power efficiency is ________

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In comparison to M-ary PSK, M-ary QAM bandwidth efficiency is _____ and power efficiency is ________

(a) Identical, superior

(b) Less, superior

(c) Identical, identical

(d) Superior, superior

I had been asked this question in a job interview.

The above asked question is from Combined Linear and Constant Envelope Modulation Techniques topic in division Modulation Techniques for Mobile Radio of Wireless/Mobile

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Correct choice is (a) Identical, superior

For explanation I would say: The power spectrum and bandwidth efficiency of QAM modulator is identical to M-ary PSK modulation. But, in terms of power efficiency QAM is superior to M-ary PSK.

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