The problem of separation of an observed sum of chaotic signals into the individual components is considered in the presence of noise. A noise threshold is found above which highquality separation is impossible. This effect is shown to be associated with the information content of chaotic signals and a theoretical estimate is given for the threshold. A method for signal separation is proposed, which uses iteration of the chaotic sources equations in reverse time. The method allows to approach the theoretical limit threshold.
This paper shows how the qualitative theory of dynamical systems, that is intensively developed during the last forty years, is currently applied in practice to provide effective wireless ultrawideband communications using chaotic information carrier.
In this work we demonstrate a possibility of generating chaotic pulses by means of parameter modulation of chaotic oscillator. Chaotic oscillator with 2.5 degrees of freedom and transistor as an active element is taken as a model. It is shown that periodic stimulation of such system allows to generate chaotic pulse stream, the duration of chaotic pulses and their duty cycle can be widely varied by suitable choice of frequency of the exciting force and bias voltage.
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