Abstract
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.
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