Chapter 3

Digital Communications in Stealth Mode

3.1    Background

Methods of transmitting proprietary data are in demand for both civil and military applications. Transmitting proprietary data is a challenging problem for the following reasons: On the one hand, if the proprietary data were intercepted, it should not be easily deciphered by an enemy (in military applications) or by a competitor (in business applications). On the other hand, proprietary data should be successfully deciphered by their intended recipient.

A traditional approach to transmitting proprietary data consists of encoding a given proprietary message in a nonrandom signal and then hiding that signal in a noise-like background. However, because the signal used for encoding ...

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