Abstract
Synchronization is one of the most challenging topics involved in the development of promising chaos-based secure communication (CBSC) for wireless applications due its direct impact on the error performance and reliability. In this paper, effects of filtering chaotic signals on the synchronization and average bit-error-rate (BER) of CBSC caused by the limited bandwidth of realistic wireless communication channels and detection requirements are investigated. To overcome the possible drawbacks of filtering process, two efficient methods called chaotic signal reconstruction technique (CSRT) and pre-filtering chaos technique (PFCT) are proposed. The well known double scroll chaotic attractor generated from Chua's circuit is utilized at both transmit and receive nodes as in a drive---response configuration with identical synchronization, and a mathematical model of single-pole low-pass filter is employed in this study. Over Rayleigh fading channel and wide range of filter cut-off frequency (?), simulation results show that as ? decreased, lesser than the bandwidth of utilized chaotic signal, the synchronization mean squared error is increased due to the resulting high distortion in the attractor's ordinary state-space. Consequently, system BER performance is degraded significantly leading to increased possibility of communication link failure. When CSRT from received filtered signal and PFCT of drive chaotic signal are utilized, the achieved results are interesting in terms of robust synchronization and error performance, and provide potential step towards wide adoption of CBSC in future applications.
Published Version
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