论文标题
可重新配置的智能表面（RIS）辅助无线覆盖范围扩展：RIS方向和位置优化
Reconfigurable Intelligent Surface (RIS) Assisted Wireless Coverage Extension: RIS Orientation and Location Optimization
论文作者
论文摘要
最近，可重新配置的智能表面（RIS）吸引了很多关注，因为它们通过反射信号向接收器来扩展细胞覆盖的能力。在这封信中，我们分析了一个基于一个基站（BS）和一个用户设备（UE）的下行链路RIS辅助网络的覆盖范围。由于RIS方向和RIS与BS之间的水平距离对细胞覆盖范围有重大影响，因此我们通过优化RIS方向和水平距离来制定RIS放置优化问题，以最大程度地提高细胞覆盖率。为了解决公式的问题，提出了覆盖范围最大化算法（CMA），并在获得封闭形式的最佳RIS方向。数值结果验证了我们的分析。
Recently, reconfigurable intelligent surfaces (RIS) have attracted a lot of attention due to their capability of extending cell coverage by reflecting signals toward the receiver. In this letter, we analyze the coverage of a downlink RIS-assisted network with one base station (BS) and one user equipment (UE). Since the RIS orientation and the horizontal distance between the RIS and the BS have a significant influence on the cell coverage, we formulate an RIS placement optimization problem to maximize the cell coverage by optimizing the RIS orientation and horizontal distance. To solve the formulated problem, a coverage maximization algorithm (CMA) is proposed, where a closed-form optimal RIS orientation is obtained. Numerical results verify our analysis.
