Multichannel digital communications by the synchronization of globally coupled chaotic systems

A multichannel digital communication method using the synchronization of globally coupled chaotic systems is proposed. The proposed method allows several binary messages to be transmitted simultaneously by just one transmitted chaotic signal, provided that outputs of different units are uncorrelated. We demonstrate the communication method on a model system consisting of Lorenz-like units. We also show how to systematically construct high-dimensional synchronizing units, based on the idea of cascaded systems. Furthermore, the dynamics of the coupled chaotic systems is discussed with particular attention paid to the correlation between the motions of different units.