Non-Coherent Chaotic Communications Aided by RIS: A Performance-Enhanced Approach

In non-coherent chaotic communications, traditional code-index-modulation-aided differential chaos shift keying (DCSK) schemes face limited gains in bit-error-rate (BER) performance, despite incurring substantial time-frequency resources. To address this challenge, we propose a new reconfigurable intelligent surface (RIS)-aided DCSK (RIS-DCSK) scheme in this letter. The proposed scheme deploys an RIS close to the transmitter antenna to enhance the signal-to-noise ratio (SNR) of the received signal, significantly improving the BER performance. We analyze the BER performance of the RIS-DCSK scheme and demonstrate its superiority. Furthermore, we propose two performance-enhanced algorithms to further improve the BER performance, though with increased computational complexity. Through simulations and comparisons, we show that the proposed RIS-DCSK scheme and its performance-enhanced variants outperform existing benchmarks in terms of BER performance.

Automated summary

In non-coherent chaotic communications, the traditional DCSK schemes have limited gains in BER performance. To overcome this issue, we propose a new RIS-aided DCSK scheme that enhances the SNR and improves BER performance by deploying an RIS close to the transmitter antenna. We analyze the BER performance of the proposed scheme and introduce two performance-enhanced algorithms with increased computational complexity to further improve BER performance.