Secure Rate Splitting in STAR-RIS Assisted Downlink MISO Systems

Hamid Reza Hashempour*, Gilberto Berardinelli

*Corresponding author for this work

Research output: Contribution to journalConference article in JournalResearchpeer-review

1 Citation (Scopus)

Abstract

This paper explores a secure downlink multiple-input single-output (MISO) system using simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) aided rate splitting multiple access (RSMA), where a base station transmits confidential signals to users, combating eavesdroppers in both transmission and reflection spaces of the RIS. Assuming known channel state information (CSI) at the base station, the RSMA strategy involves splitting user messages into common and private parts, aiming to maximize the sum secrecy rate under power and beamforming constraints. We address the non-convex optimization challenge through alternating optimization and the sequential convex approximation (SCA) method, focusing on both active and passive beamforming. Our simulations highlight notable enhancements in secrecy rate and spectral efficiency via STAR-RIS, underscoring the effectiveness of our algorithms. Furthermore, our approach outperforms the non-orthogonal multiple access (NOMA) technique.

Original languageEnglish
Journal2024 IEEE International Mediterranean Conference on Communications and Networking, MeditCom 2024
Pages (from-to)529-534
Number of pages6
DOIs
Publication statusPublished - 2024
Event2024 IEEE International Mediterranean Conference on Communications and Networking, MeditCom 2024 - Madrid, Spain
Duration: 8 Jul 202411 Jul 2024

Conference

Conference2024 IEEE International Mediterranean Conference on Communications and Networking, MeditCom 2024
Country/TerritorySpain
CityMadrid
Period08/07/202411/07/2024
SponsorHuawei Technologies Co., Ltd., Universidad Carlos III de Madrid (UC3M), Viavi

Bibliographical note

Publisher Copyright:
© 2024 IEEE.

Keywords

  • physical layer security
  • Rate-Splitting
  • reconfigurable intelligent surfaces
  • simultaneous transmission and reflection

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