Journal of IKEEE (전기전자학회논문지)

Institute of Korean Electrical and Electronics Engineers (한국전기전자학회)
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A study on scheme for activating active elements in RIS aided wireless communication system

RIS를 활용한 무선 통신 시스템에서 능동 반사 소자를 활성화하는 기법에 관한 연구

  • Jinsoo Bae (Department of Electrical Engineering, Sejong University) ;
  • Seung-Geun Yoo (Department of Information and Communication Engineering & Convergence Engineering for Intelligent Drone, Sejong University) ;
  • Hyoung-Kyu Song (Department of Information and Communication Engineering & Convergence Engineering for Intelligent Drone, Sejong University)
  • Received : 2023.10.23
  • Accepted : 2023.11.01
  • Published : 2023.12.31
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Abstract

In this paper, the scheme to activate the active elements of reconfigurable intelligent surface(RIS) is proposed. Recently, RIS has been studied as a technology that improves communication coverage and spectral efficiency in wireless communication system. RIS can adjust the phase and amplitude of the received signal, and can ensure better communication performance in areas with many obstacles, such as urban areas. However, due to RIS, the signal undergoes fading twice and performance decrease in communication. Recently, RIS using active reflection elements has been studied to solve these problems. However, if the entire RIS is used as an active reflection element, energy consumption increases. Accordingly, in this paper, we propose a system that utilizes some of the RIS reflective elements as active reflective elements and a scheme for selecting active reflective elements to be activated.

본 논문에서는 reconfigurable intelligent surface(RIS)의 능동소자를 활성화하는 기법을 제안한다. 최근 RIS는 무선 통신 시스템에서 통신 커버리지와 주파수 효율을 향상기키는 기술로 주목받고 있다. RIS는 수신받는 신호의 위상과 진폭을 조절할 수 있는 기술로 도심과 같이 장애물이 많은 지역에 활용하면 더 좋은 통신 성능을 보장할 수 있다. 하지만 RIS에 의해 신호는 두 번의 페이딩을 겪게 되고 이에 따라 통신 성능의 저하가 발생한다. 최근 이러한 문제를 해결하기 위해 능동 반사 소자를 활용한 RIS가 연구되고 있다. 하지만 RIS 전체를 능동 반사 소자로 활용하게 되면 에너지 소비량이 증가하게 된다. 이에 본 논문에서는 RIS 반사 소자 중 일부만 능동 반사 소자로 활용하는 시스템을 제안하고 활성화되는 능동 반사 소자를 선택하는 기법에 대해 제안한다.

Keywords

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education(2020R1A6A1A03038540), the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT) (No. NRF-2021R1A2C2005777) and Institute of Information & communications Technology Planning & Evaluation (IITP) under the metaverse support program to nurture the best talents (IITP-2023-RS-2023-00254529) grant funded by the Korea government(MSIT)

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