Masked Symmetric Chaos Shift Keying : Modulation and demodulation of Chua´s circuits using PI control estimated from LMI criterion

This paper deals with a new modulation technique based on symmetric chaos shift keying (SCSK) and its receiver structure is described for optimal synchronization. The masked symmetric chaos shift keying (MSCSK) improves both security of information signal compared to SCSK and demodulation procedure. Optimal synchronization of two identical chaotic systems is performed in the paper. By using dissipativity theory, a PI control system is proposed according to linear matrix inequality (LMI). The coefficients of PI are resolved using the MATLAB LMI Toolbox. The proposed controller is simple and can be easily implemented in the demodulator. Simulation results are presented for the Chua circuit and show the effectiveness of the proposed scheme