论文标题
3D波束在可重新配置的智能表面辅助无线通信网络中
3D Beamforming in Reconfigurable Intelligent Surfaces-assisted Wireless Communication Networks
论文作者
论文摘要
可重新配置的智能表面（RIS）或智能反射表面（IRS）是可以在无线环境中的各个地方部署的元信息，以使这些环境可控制和重新配置。在本文中，我们调查了在RIS授权的无线网络中使用3D波束形成的问题，并提出了一种新方案，该方案在设计和部署基于RIS的网络方面提供了更多自由度。在拟议的方案中，配备了完整维天线阵列的基站（BS）在三维空间中优化了其辐射模式，以最大程度地利用目标用户接收的信号与噪声比。我们还研究了RIS接收信号的入射角对其反射特性的影响，并找到该角度与BS天线阵列的倾斜和高程角度之间的关系。用户从RI的反射路径以及从BS的直接路径接收信号，这两者都取决于BS天线阵列的倾斜和高程角。这些角度以及RIS元素的相移共共同优化。我们的仿真结果表明，使用RIS辅助3D波束进行优化的相移和辐射角可以大大提高无线网络的性能。
Reconfigurable Intelligent Surfaces (RIS) or Intelligent Reflecting Surfaces (IRS) are metasurfaces that can be deployed in various places in wireless environments to make these environments controllable and reconfigurable. In this paper, we investigate the problem of using 3D beamforming in RIS-empowered wireless networks and propose a new scheme that provides more degrees of freedom in designing and deploying the RIS-based networks. In the proposed scheme, a base station (BS) equipped with a full dimensional array of antennas optimizes its radiation pattern in the three-dimensional space to maximize the received signal to noise ratio at a target user. We also study the effect of angle of incidence of the received signal by the RIS on its reflecting properties and find a relation between this angle and the BS antenna array's tilt and elevation angles. The user receives the signal from a reflected path from the RIS as well as from a direct path from the BS which both depend on the BS antenna array's tilt and elevation angles. These angles and also the RIS element's phase shifts are jointly numerically optimized. Our simulation results show that using RIS-assisted 3D beamforming with optimized phase shifts and radiation angles can considerably improve the performance of wireless networks.
