Question

Energy spectral density defines

(a) Signal energy per unit area

(b) Signal energy per unit bandwidth

(c) Signal power per unit area

(d) Signal power per unit bandwidth

I have been asked this question during an online exam.

This question is from Spectral Density and Autocorrelation in portion Signals and Spectra of Digital Communications

Answer 1

The correct answer is (b) Signal energy per unit bandwidth

The explanation is: Energy spectral density gives the signal energy equal to the area under the waveform energy spectral density versus frequency curve.