Reconfigurable intelligent surface (RIS)-empowered communication is an emerging technology that has recently received growing attention as a potential candidate for next-generation wireless communications. Although RISs have shown the potential of manipulating the wireless channel through passive beamforming, it is shown that they can also bring undesired side effects, such as reflecting the electromagnetic interference (EMI) from the surrounding environment to the receiver side. In this study, we propose a novel EMI cancellation scheme to mitigate the impact of the EMI by exploiting its special time-domain structure and considering a clever passive beamforming method at the RIS. Compared to its benchmark, computer simulations show that the proposed scheme achieves superior performance in terms of the average signal-to-interference-plus-noise ratio (SINR) and outage probability (OP), especially when the EMI power is comparable to the power of the information signal impinging on the RIS surface.

翻译：可重构智能表面（RIS）赋能通信是一项新兴技术，近年来作为下一代无线通信的潜在候选方案受到广泛关注。尽管RIS已被证明具备通过无源波束赋形操控无线信道的能力，但研究显示其也会带来不良副作用，例如将周围环境中的电磁干扰（EMI）反射至接收端。本研究中，我们提出了一种新型电磁干扰消除方案，通过利用EMI的特定时域结构并结合RIS的巧妙无源波束赋形方法，有效缓解EMI的影响。与基准方案相比，计算机仿真表明，所提方案在平均信干噪比（SINR）和中断概率（OP）方面均实现了更优性能，特别是当EMI功率与入射到RIS表面的信息信号功率相当时效果尤为显著。