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：本文探索了两种革命性技术的集成——可重构智能表面（RIS）与正交时频空（OTFS）调制，以增强高速无线通信。我们提出了一种面向RIS辅助OTFS的新型相移设计算法，在动态环境中优化能量接收与信道增益。本研究在下行链路场景中对所提方法进行了评估，结果表明与文献中的基准方案相比，该方法在误码率（BER）等指标上实现了显著性能提升。实验结果展示了RIS提升系统性能的潜力。具体而言，我们提出的相移设计技术相较于基准方案实现了超过4 dB的增益。此外，随着RIS单元数量的增加，还可获得更大的性能增益。