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Abstract

In the present invention, the structure, principle and framework of chaotic digital code-division multiple access ((CD).sup.2 MA) communication systems are presented. Unlike the existing CDMA systems, (CD).sup.2 MA systems use continuous pseudo-random time series to spread the spectrum of message signal and the spread signal is then directly sent through channel to the receiver. In this sense, the carrier used in (CD).sup.2 MA is a continuous pseudo-random signal instead of a single tone as used in CDMA. The statistical properties of the noise-like carriers are given. In a (CD).sup.2 MA system, every mobile station has the same structure and parameters, only different initial conditions are assigned to different mobile stations. Instead of synchronizing two binary pseudo-random sequences as in CDMA systems, an impulsive control scheme is used to synchronize two chaotic systems in (CD).sup.2 MA. Simulation results show that the channel capacity of (CD).sup.2 MA is at least twice as large than that of CDMA.

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First Claim