Noise-suppressing chaos generator to improve BER for DCSK systems

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Conference Proceeding

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In this paper, we propose a noise suppressing chaos generator to improve the bit error rate (BER) performances for the high-order differential chaos shift keying (DCSK) systems. The presented chaos generator outputs the overlapping chaotic sequences for the information modulation, which use a buffer for temporary storage, and the stored chaotic sequence is used to modulate the information bit while the second element of the chaotic sequence is fed back to serve as the initial value to generate chaotic sequence for the modulation of the next information bit. Namely, the different information bit may share the same chaotic segments of the whole chaotic sequence. Thus, the repetitive transmission of the same reference chaotic segments suppress the channel noise, and the BER performance of high-order DCSK systems are improved. We derive the theoretical BER expression for the proposed scheme over additive white Gaussian noise (AWGN) channel. The simulation results match the theoretical BER, and demonstrate that the BER performances have been improved with the use of noise-suppressing chaos generator.



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