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Which of the following is the ratio of signal energy per bit to noise power spectral density?

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Which of the following is the ratio of signal energy per bit to noise power spectral density?

(a) Bandwidth efficiency

(b) Spectral density

(c) Power efficiency

(d) Power density

This question was posed to me in class test.

This is a very interesting question from Digital Modulation in chapter Modulation Techniques for Mobile Radio of Wireless/Mobile

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Correct choice is (c) Power efficiency

The explanation: Power efficiency is often expressed as the ratio of signal energy per bit to noise power spectral density required at the receiver input for a certain probability of error. Power efficiency is a measure of how favourably the trade-off between fidelity and signal power is made.

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