Q.

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
Answer» C. power efficiency
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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