Chaotic communications that are difficult to detect.
Work on self-synchronizing systems for communications has had limited practicality because the chaotic signals were not as easy to detect in the presence of noise as conventional spread-spectrum signals. This difficulty may actually be an advantage in some cases, where one wants to conceal the existence of the communications signal. Conventional communications signals are cyclostationary; while they may look random, they have statistical properties that vary periodically. One may design chaotic communication signals that lack this cyclostationary property, and therefore are harder to detect.
Carroll
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Code 6345, U.S. Naval Research Laboratory, Washington, D.C. 20375, USA.