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Communication in the Presence of Noise

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1 Author(s)
Shannon, C.E. ; Bell Telephone Laboratories, Murray Hill, N.J.

A method is developed for representing any communication system geometrically. Messages and the corresponding signals are points in two "function spaces," and the modulation process is a mapping of one space into the other. Using this representation, a number of results in communication theory are deduced concerning expansion and compression of bandwidth and the threshold effect. Formulas are found for the maxmum rate of transmission of binary digits over a system when the signal is perturbed by various types of noise. Some of the properties of "ideal" systems which transmit at this maxmum rate are discussed. The equivalent number of binary digits per second for certain information sources is calculated.

Published in:

Proceedings of the IRE  (Volume:37 ,  Issue: 1 )

Date of Publication:

Jan. 1949

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