Design and circuit simulation of observer-based chaotic synchronization and communication systems

The design and simulation of an analogue integrated circuit for the observe r-based synchronization of two chaotic systems and its application to chaot ic communication are presented. The chaotic synchronization systems consist of a specially designed drive system and a response. The response system i s then designed on the basis of the technique of linear matrix inequality-b ased state observer design, in which the observer gain is appropriately sel ected such that the state errors of the drive-response systems asymptotical ly converge to zero. The proposed observer-based synchronization scheme is then applied to chaotic communication applications, in which the chaotic mo dulation method is used while the chaotically masked signal and the informa tion are fed back into the transmitter and the former is simultaneously tra nsmitted to the receiver. In addition, the well-known chaotic Rossler syste m is considered as an illustrative example, along with its circuit implemen tation which is also described. Results obtained from PSPICE circuit simula tions are given to demonstrate the proposed scheme's effectiveness.