Active Reconfigurable Intelligent Surface Enhanced Internet of Medical Things

Zhengyu Zhu, Jiaxue Li, Zheng Chu, Jing Liang, Hehao Niu, De Mi, Cheng Yin, Peijia Liu

Research output: Journal PublicationArticlepeer-review


The incredible potentiality of reconfigurable intelligent surface (RIS) in addressing power supply and obstacle environment of Internet of Medical Things (IoMT) has been capturing our interest. Considering the nettlesome “double-fading” effect introduced by passive RIS, we investigate an active RIS-enhanced IoMT system in this paper, where the wireless power transfer (WPT) from power station (PS) to IoMT devices and the wireless information transfer (WIT) from IoMT devices to the access point (AP) are both implemented with the assistance of active RIS. Aiming to maximize the sum throughput of the considered IoMT system, a joint design of time schedules and reflecting coefficient matrices of the active RIS is proposed. Trapped by the non-convex and obstinate optimization problem, we explore the semi-definite programming (SDP) relaxation and successive convex approximation (SCA) techniques based on alternating optimization (AO) algorithm. Simulation results verify our solution approach to the intractable optimization problem and showcase the boosted spectrum and energy efficiency of the active RIS-enhanced IoMT system.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalIEEE Journal of Biomedical and Health Informatics
Publication statusAccepted/In press - 2023


  • Active reconfigurable intelligent surface
  • Bioinformatics
  • Communication system security
  • IoMT
  • Optimization
  • Resource management
  • Throughput
  • Wireless communication
  • Wireless sensor networks
  • alternating optimization
  • wireless information transfer
  • wireless power transfer

ASJC Scopus subject areas

  • Computer Science Applications
  • Health Informatics
  • Electrical and Electronic Engineering
  • Health Information Management


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