Design of Divide-and-Conquer Noise Decontamination Strategy for M-Ary DCSK: From Remodulation to Denoising

In this letter, an effective divide-and-conquer noise decontamination strategy is proposed to reduce the noise corrupting the reference signals of Hilbert-transform-based M-ary differential chaos shift keying (M-ary DCSK), thereby enhancing the system robustness. An M-ary DCSK with discrete Hartley transform (MDCSK-DHT) is first proposed, which is taken as an example to show the effectiveness of the proposed noise decontamination strategy. Then, a noise-decontamination-driven MDCSK-DHT (ND-MDCSK-DHT) scheme is presented. In this design, the discrete Hartley transform enables the reference and M-ary information-bearing signals to be transmitted in the same time slot, which improves the spectral efficiency and peak to average power ratio (PAPR) performance. Computer simulations show that the bit error rate (BER) performance of MDCSK-DHT can be significantly enhanced by the proposed noise decontamination strategy, and ND-MDCSK-DHT can achieve better BER performance than its competitors.

Automated summary

This paper proposes an effective divide-and-conquer noise decontamination strategy to enhance the robustness of M-ary differential chaos shift keying (M-ary DCSK) systems. The strategy utilizes a discrete Hartley transform to improve the transmission efficiency and performance. Computer simulations demonstrate the significant improvement in bit error rate (BER) achieved by the proposed strategy.