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A Comparative Study of Reconfigurable Intelligent Surfaces with Relays in UAV Cooperative Communications

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Advances in Information and Communication (FICC 2023)

Part of the book series: Lecture Notes in Networks and Systems ((LNNS,volume 651))

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Abstract

Reconfigurable Intelligent Surface (RIS) is an emerging technique proposed for the 6th Generation (6G) network to manipulate the propagation environment for wireless transmission. Since unmanned aerial vehicle (UAV) offers 3D mobility and high availability of line-of-sight link, the integration of UAV with the RIS (UAV-RIS) have received much attention. This paper aims to study the comparison between the RIS and the conventional active relays for UAV cooperative communications. The numerical results show that the energy efficiencies of the active relays are higher when the UAV is placed close to the middle point between the BS and UE, whereas the RIS performs better when the UAV is close to either the BS or the UE. Besides, decode-and-forward (DF) relay achieves higher energy efficiency than the amplify-and-forward (AF) relays. In addition, the performance of the full-duplex relaying mode is affected by the residual self-interference (SI), while the performance of RIS is significantly affected by the number of elements. There is none of the relaying modes works well in all conditions, and the performance of the relaying modes depends on the system frequency used.

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Acknowledgment

This work was supported in part by the Ministry of Higher Education Malaysia under Grant FRGS/1/2020/TK0/UTM/02/68, in part by Universiti Teknologi Malaysia under Grant 08G83 and in part by Hanyang University under Grant 4B675.

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Authors and Affiliations

  1. Wireless Communication Centre, Faculty of Electrical Engineering, Universiti Teknologi Malaysia, 81310, Johor Bahru, Malaysia

    Chi Yen Goh & Chee Yen Leow

Authors
  1. Chi Yen Goh
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  2. Chee Yen Leow
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Correspondence to Chee Yen Leow .

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Editors and Affiliations

  1. Faculty of Science and Engineering, Saga University, Saga, Japan

    Kohei Arai

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Goh, C.Y., Leow, C.Y. (2023). A Comparative Study of Reconfigurable Intelligent Surfaces with Relays in UAV Cooperative Communications. In: Arai, K. (eds) Advances in Information and Communication. FICC 2023. Lecture Notes in Networks and Systems, vol 651. Springer, Cham. https://doi.org/10.1007/978-3-031-28076-4_10

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