Chaotic signals and systems for communications

The authors propose and demonstrate two approaches to communications based on synchronized chaotic signals and systems. In the first approach, a chaotic masking signal is added at the transmitter and regenerated and subtracted at the receiver. The second approach utilizes modulation of the coefficients of the chaotic system in the transmitter and corresponding detection of synchronization error in the receiver to transmit binary-valued bit streams. Both approaches are demonstrated using a transmitter circuit with dynamics that are governed by the chaotic Lorenz system. A synchronizing receiver circuit which exploits the ideas of synchronized chaotic systems is used for signal recovery.<>