Document Type
Journal Article
Publication Title
Drones
Volume
7
Issue
6
Publisher
MDPI
School
School of Science / Security Research Institute
RAS ID
60249
Funders
National Natural Science Foundation of China
Abstract
Different from conventional reconfigurable intelligent surfaces (RIS), simultaneous transmitting and reflecting RIS (STAR-RIS) can reflect and transmit signals to the receiver. In this paper, to serve more ground users and increase deployment flexibility, we investigate an unmanned aerial vehicle (UAV) equipped with STAR-RIS (STAR-RIS-UAV)-aided wireless communications for multi-user networks. Energy splitting (ES) and mode switching (MS) protocols are considered to control the reflection and transmission coefficients of STAR-RIS elements. To maximize the sum rate of the STAR-RIS-UAV-aided coordinated multipoint (CoMP) cellular system for multi-user networks, the corresponding beamforming vectors as well as transmitted and reflected coefficient matrices are optimized. Specifically, instead of adopting the alternating optimization, we design an iteration method to optimize all variables for both the ES and MS protocols at the same time. Simulation results reveal that the STAR-RIS-UAV-aided CoMP system has a much higher sum rate than systems with conventional RIS or without RIS. Furthermore, the proposed structure is more flexible than fixed STAR-RIS and could greatly promote the sum rate.
DOI
10.3390/drones7060403
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Comments
Shi, B., Wang, Y., Li, D., Cai, W., Lin, J., Zhang, S., . . . Shu, F. (2023). STAR-RIS-UAV-aided coordinated multipoint cellular system for multi-user networks. Drones, 7(6), article 403. https://doi.org/10.3390/drones7060403