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On the Chaos Synchronization in CBSC Systems over Realistic Wireless Channels

Chaos-based secure communication (CBSC) is a promising cost effective solution for diverse wireless applications. However, chaos synchronization between transmit and receive ends over realistic fading channels is still challenging due its direct impact on the system reliability. In this paper, effect of filtering varied chaotic signals on the synchronization of CBSC schemes is investigated. The filter process is realized in practice due to the constrained channel bandwidth and signal detection requirements. Lorenz chaotic attractor (LCA) and the double scroll attractor (DSA) are used at the transmit and receive ends as in a drive-response design with identical synchronization. Simulation results over Rayleigh fading channel confirm that as the filter bandwidth decreased lesser than the bandwidth of utilized chaotic signals, the synchronization error is considerably increased due to the resulting high distortion of attractors' configurations. Besides, DSA demonstrate superior performance compared with LCA at low filter bandwidth due to its spectral properties. This may lead to significant degradation in the system error performance and hence the link reliability. Thus, efficient system design is required using suitable chaos signal generators to mitigate the filtering effects towards wider adoption of CBSC in future wireless applications.