Affiliation:
1. Changwang School of Honors Nanjing University of Information Science and Technology Nanjing People's Republic of China
2. School of Artificial Intelligence/School of Future Technology Nanjing University of Information Science and Technology Nanjing People's Republic of China
3. National Mobile Communications Research Laboratory Southeast University Nanjing People's Republic of China
Abstract
AbstractConsisting of a large number of passive reflectors, reconfigurable intelligent surface (RIS) has gained traction as an approach to enhance communication quality. The specular reflection assumption is common when ideal conditions are considered. In this paper, an anomalous‐reflector model was found for each RIS reflection unit, deviating from the specular reflector assumption, and the impacts of the aperture area and radiation pattern of the RIS reflecting elements are taken into account. A three‐dimensional (3D) geometry‐based RIS‐assisted channel model is proposed for stochastic multiple‐input multiple‐output (MIMO) unmanned aerial vehicle (UAV)‐to‐ground communications. The RIS is deployed on an additional UAV in the proposed model, which assists the UAV transmitter for reflecting its own signals to the mobile receiver (MR) on the ground level, thereby boosting the quality of signal transmission. In order to achieve a perfect beam alignment towards the desired direction, the reflection phase is regulated by considering the propagation distances among UAV, RIS, and MR.
Funder
National Natural Science Foundation of China
National Mobile Communications Research Laboratory, Southeast University
Publisher
Institution of Engineering and Technology (IET)
Subject
Electrical and Electronic Engineering,Computer Science Applications