An Approach for CSK Detection Based on Return Maps

Chaos-based communication can be applied advantageously only if the property of chaotic systems is suitably exploited. In this paper a simple non-coherent detection method for chaos-shiftkeying (CSK) modulation is proposed. Unlike the bit-energy-based detection which makes no specific use of any chaotic system property, the method proposed here exploits some distinguishable property of the two chaotic maps for recovering the digital message. Specifically, the proposed method exploits the difference in the return maps of the signals representing the digital symbols. Simple skew tent maps are used for illustration. The determining property of the return maps is computed using a simple linear regression algorithm. The bit-error-rate under additive white Gaussian noise is studied by computer simulations.