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M-ary modulation schemes have very good power efficiency.

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M-ary modulation schemes have very good power efficiency.

(a) True

(b) False

I have been asked this question in an online interview.

This is a very interesting question from Combined Linear and Constant Envelope Modulation Techniques topic in section Modulation Techniques for Mobile Radio of Wireless/Mobile

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The correct choice is (b) False

Best explanation: M-ary modulation schemes have poor power efficiency, but they have a better bandwidth efficiency. An 8-PSK system requires a bandwidth that is 3 times smaller than a BPSK system, whereas its BER performance is very worse since signals are packed more closely in the signal constellation.

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