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Spread spectrum communication systems based on chaotic carrier sequences are examined for their security and robustness in the presence of noise and other interferences. Both discrete and continuous time chaotic carriers are examined and methods for determining the effectiveness of such carriers are discussed. An experimental implementation of a chaotic communication system was built and tested, and then compared with theory and the results from simulations.

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The transition from periodicity to chaos for the simplest dissipative nonautonomous circuit is examined in the bispectral domain. The bispectrum and the corresponding bicoherence spectrum demonstrate the complex nonlinear interactions that the circuit exhibits.

The effects of both hard and soft nonlinearities are examined in the frequency domain. Softening the hard nonlinearity in Chua's diode has a similar effect to low pass filtering or reducing the level of high frequency noise components.