In this paper, we explore the integration of two revolutionary technologies, reconfigurable intelligent surfaces (RISs) and orthogonal time frequency space (OTFS) modulation, to enhance high-speed wireless communications. We introduce a novel phase shift design algorithm for RIS-assisted OTFS, optimizing energy reception and channel gain in dynamic environments. The study evaluates the proposed approach in a downlink scenario, demonstrating significant performance improvements compared to benchmark schemes in the literature, particularly in terms of bit error rate (BER). Our results showcase the potential of RIS to enhance the system's performance. Specifically, our proposed phase shift design technique outperforms the benchmark solutions by over 4 dB. Furthermore, even greater gains can be obtained as the number of RIS elements increases.

翻译：本文探索了可重构智能表面（RIS）与正交时频空间（OTFS）调制两种革命性技术的融合，旨在增强高速无线通信性能。我们提出了一种新颖的RIS辅助OTFS相位偏移设计算法，该算法可在动态环境中优化能量接收与信道增益。研究在下行链路场景中评估了所提方案，结果表明，与文献中的基准方案相比，所提方案在比特误码率（BER）方面具有显著性能提升。我们的结果展示了RIS增强系统性能的潜力。具体而言，所提出的相位偏移设计技术相较于基准方案实现了超过4 dB的性能增益。此外，随着RIS单元数量的增加，可获得更大的性能增益。