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

• Published in: IEEE communications letters Vol. 27; no. 6; pp. 1614 - 1618
• Main Authors: Cai, Xiangming, Huang, Chongwen, An, Jiancheng, Xu, Weikai, Wang, Lin, Yuen, Chau
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.06.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Channel models; Chaotic communication; differential chaos shift keying; Indexes; Keying; Non-coherent chaotic communications; Receiving antennas; reconfigurable intelligent surface; Signal to noise ratio; Time-frequency analysis; Transmitting antennas
• ISSN: 1089-7798; 1558-2558
• DOI: 10.1109/LCOMM.2023.3268031

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.