학술논문
RIS Reflection and Placement Optimisation for Underlay D2D Communications in Cognitive Cellular Networks
Document Type
Conference
Source
ICASSP 2023 - 2023 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) Acoustics, Speech and Signal Processing (ICASSP), ICASSP 2023 - 2023 IEEE International Conference on. :1-5 Jun, 2023
Subject
Language
ISSN
2379-190X
Abstract
Reconfigurable intelligent surface (RIS) is considered a promising technology in sixth-generation (6G) networks due to its ability to configure the phase of signals using low-cost reflecting elements. An RIS-aided device-to-device (D2D) communication system operating in underlay mode is considered in this work. Assuming the presence of a direct link between the D2D pair, we present a closed-form expression of signal-to-interference and noise ratio (SINR) at the D2D user. We aim to solve the SINR maximisation problem by jointly optimising the power allocated to the D2D source and the RIS placement. A closed-form global optimal solution to the proposed optimisation problem has been obtained. Numerical results are presented to validate the analytical framework. Our proposed solution can yield a significant gain of around 4.65 dB over the benchmark.