Communication in the Presence of Noise
Shannon, Claude E.
Proceedings of the IRE 37, no. 1 (1949): 10-21
https://doi.org/10.1109/JRPROC.1949.232969
“Let us suppose that the channel has a certain bandwidth W in cps starting at zero frequency, and that we are allowed to use this channel for a certain period of time T. Without any further restrictions this would mean that we can use as signal functions any functions of time whose spectra lie entirely within the band W, and whose time functions lie within the interval T. Although it is not possible to fulfill both of these conditions exactly, it is possible to keep the spectrum within the band W, and to have the time function very small outside the interval T. Can we describe in a more useful way the functions which satisfy these conditions?”
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