标题： 可重构智能表面辅助的单一接入点集成通信和定位 显示英文标题

标题： Reconfigurable Intelligent Surface Aided Integrated Communication and Localization with a Single Access Point

摘要： 可重构智能表面（RIS）不仅辅助通信，还有助于用户设备（UE）的定位。 本研究专注于通过多个RIS辅助单个接入点（AP）实现室内UE的定位。 首先，我们提出了一种两阶段的信道估计方案，其中RIS元件的相位偏移被调整以获得多个信道探测。 在第一阶段，新的正交匹配追踪算法从接收到的信号中提取多条路径的参数。 然后，识别视距路径和RIS反射路径。 在第二阶段，利用具有不同相位偏移的RIS反射路径的估计路径增益，通过获得角度伪谱来确定RIS处的到达角（AOA）。 因此，通过将AP和RIS作为参考点，线性最小二乘估计器可以使用估计的AOA来定位UE。 仿真结果表明，所提出的算法可以在讨论的场景中实现厘米级的定位精度。 此外，伪谱的更高精度、更多的信道探测次数以及更多的参考点都可以提高UE的定位精度。 显示英文摘要

摘要： Reconfigurable intelligent surfaces (RISs) not only assist communication but also help the localization of user equipment (UE). This study focuses on the indoor localization of UE with a single access point (AP) aided by multiple RISs. First, we propose a two-stage channel estimation scheme where the phase shifts of RIS elements are tuned to obtain multiple channel soundings. In the first stage, the newtonized orthogonal matching pursuit algorithm extracts the parameters of multiple paths from the received signals. Then, the LOS path and RIS-reflected paths are identified. In the second stage, the estimated path gains of RIS-reflected paths with different phase shifts are utilized to determine the angle of arrival (AOA) at the RIS by obtaining the angular pseudo spectrum. Consequently, by taking the AP and RISs as reference points, the linear least squares estimator can locate UE with the estimated AOAs. Simulation results show that the proposed algorithm can realize centimeter-level localization accuracy in the discussed scenarios. Moreover, the higher accuracy of pseudo spectrum, a larger number of channel soundings, and a larger number of reference points can realize higher localization accuracy of UE.