A new hybrid DCSK-CDSK scheme for Chaos based communications

In this paper, a new noncoherent chaos based communication scheme is presented. System is a hybrid combination of Differential Chaos Shift Keying (DCSK) and Correlation Delay Shift Keying (CDSK) schemes. Here, reference signal block is the sum of outputs from two identical chaos signal generators shifted from each other by a fixed delay, and then each pair of bits is modulated using the same output of the individual chaos signal generator. Simply, the system utilizes the low cross correlation value between chaos samples and its delayed version. Bit-error performance in additive-white-Gaussian-noise of the proposed system is analyzed and compared with the other conventional chaos based communication systems. Clear matching between theoretical expression and simulations result is obtained at high spreading factor.