论文标题
RIS辅助集成感应和通信：子空间旋转方法
RIS-assisted Integrated Sensing and Communications: A Subspace Rotation Approach
论文作者
论文摘要
在本文中，我们提出了一种新颖的关节主动和被动的光束方法，以借助可重构的智能表面（RISS）同时检测目标并与通信用户进行通信，以进行集成感应和通信（ISAC）传输。我们首先表明，由于RISS控制ISAC通道的能力，传感和通信（S＆C）的性能可以共同提高。特别是，我们表明RIS可以通过修改基础子空间来优惠地增强S＆C通道的通道增益和耦合度。鉴于此，我们开发了一种启发式算法，该算法扩展并旋转了能够显着改善ISAC性能的S＆C子空间。为了验证子空间旋转方案的有效性，我们进一步提供了一个基准方案，该方案在传感接收器处最大化信噪比（SNR），同时保证通信用户的SNR。最后，提供了数值模拟来验证所提出的方法。
In this paper, we propose a novel joint active and passive beamforming approach for integrated sensing and communication (ISAC) transmission with assistance of reconfigurable intelligent surfaces (RISs) to simultaneously detect a target and communicate with a communication user. We first show that the sensing and communication (S&C) performance can be jointly improved due to the capability of the RISs to control the ISAC channel. In particular, we show that RISs can favourably enhance both the channel gain and the coupling degree of S&C channels by modifying the underlying subspaces. In light of this, we develop a heuristic algorithm that expands and rotates the S&C subspaces that is able to attain significantly improved ISAC performance. To verify the effectiveness of the subspace rotation scheme, we further provide a benchmark scheme which maximizes the signal-to-noise ratio (SNR) at the sensing receiver while guaranteeing the SNR at the communication user. Finally, numerical simulations are provided to validate the proposed approaches.
