BD-RIS-Aided RSMA-ISAC Systems: Joint Rate Splitting and Beamforming Design

Ying Xie; Liping Li; Yingsong Li; Liang Yang; Xingwang Li; Ali Ghrayeb

doi:10.1109/LCOMM.2025.3642334

BD-RIS-Aided RSMA-ISAC Systems: Joint Rate Splitting and Beamforming Design

Ying Xie
, Liping Li
, Yingsong Li^*
, Liang Yang
, Xingwang Li
, Ali Ghrayeb

^*Corresponding author for this work

HBKU College of Science and Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

An integrated sensing and communication (ISAC) system with a fully connected beyond-diagonal reconfigurable intelligent surface (BD-RIS) and rate splitting multiple access (RSMA) is investigated. To maximize the sum rate of multiple users while meeting sensing quality requirements, we jointly optimize the active beamforming at the base station and the reflective beamforming at the BD-RIS. The nonconvex optimization problem is addressed using an alternating algorithm based on weighted minimum mean square error (WMMSE), penalty-dual-decomposition (PDD), and successive convex approximation (SCA). Simulation results validate the benefits of the proposed scheme and the performance gains from deploying BD-RIS in RSMA-ISAC systems.

Original language	English
Pages (from-to)	472-476
Number of pages	5
Journal	IEEE Communications Letters
Volume	30
DOIs	https://doi.org/10.1109/LCOMM.2025.3642334
Publication status	Published - 2026

Keywords

Beyond-diagonal reconfigurable intelligent surface (BD-RIS)
integrated sensing and communication (ISAC)
rate splitting multiple access (RSMA)

Access to Document

10.1109/LCOMM.2025.3642334

Cite this

@article{a5845a95ec3348a588efe9b3860fe9ad,

title = "BD-RIS-Aided RSMA-ISAC Systems: Joint Rate Splitting and Beamforming Design",

abstract = "An integrated sensing and communication (ISAC) system with a fully connected beyond-diagonal reconfigurable intelligent surface (BD-RIS) and rate splitting multiple access (RSMA) is investigated. To maximize the sum rate of multiple users while meeting sensing quality requirements, we jointly optimize the active beamforming at the base station and the reflective beamforming at the BD-RIS. The nonconvex optimization problem is addressed using an alternating algorithm based on weighted minimum mean square error (WMMSE), penalty-dual-decomposition (PDD), and successive convex approximation (SCA). Simulation results validate the benefits of the proposed scheme and the performance gains from deploying BD-RIS in RSMA-ISAC systems.",

keywords = "Beyond-diagonal reconfigurable intelligent surface (BD-RIS), integrated sensing and communication (ISAC), rate splitting multiple access (RSMA)",

author = "Ying Xie and Liping Li and Yingsong Li and Liang Yang and Xingwang Li and Ali Ghrayeb",

note = "Publisher Copyright: {\textcopyright} 1997-2012 IEEE.",

year = "2026",

doi = "10.1109/LCOMM.2025.3642334",

language = "English",

volume = "30",

pages = "472--476",

journal = "IEEE Communications Letters",

issn = "1089-7798",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

}

TY - JOUR

T1 - BD-RIS-Aided RSMA-ISAC Systems

T2 - Joint Rate Splitting and Beamforming Design

AU - Xie, Ying

AU - Li, Liping

AU - Li, Yingsong

AU - Yang, Liang

AU - Li, Xingwang

AU - Ghrayeb, Ali

PY - 2026

Y1 - 2026

N2 - An integrated sensing and communication (ISAC) system with a fully connected beyond-diagonal reconfigurable intelligent surface (BD-RIS) and rate splitting multiple access (RSMA) is investigated. To maximize the sum rate of multiple users while meeting sensing quality requirements, we jointly optimize the active beamforming at the base station and the reflective beamforming at the BD-RIS. The nonconvex optimization problem is addressed using an alternating algorithm based on weighted minimum mean square error (WMMSE), penalty-dual-decomposition (PDD), and successive convex approximation (SCA). Simulation results validate the benefits of the proposed scheme and the performance gains from deploying BD-RIS in RSMA-ISAC systems.

AB - An integrated sensing and communication (ISAC) system with a fully connected beyond-diagonal reconfigurable intelligent surface (BD-RIS) and rate splitting multiple access (RSMA) is investigated. To maximize the sum rate of multiple users while meeting sensing quality requirements, we jointly optimize the active beamforming at the base station and the reflective beamforming at the BD-RIS. The nonconvex optimization problem is addressed using an alternating algorithm based on weighted minimum mean square error (WMMSE), penalty-dual-decomposition (PDD), and successive convex approximation (SCA). Simulation results validate the benefits of the proposed scheme and the performance gains from deploying BD-RIS in RSMA-ISAC systems.

KW - Beyond-diagonal reconfigurable intelligent surface (BD-RIS)

KW - integrated sensing and communication (ISAC)

KW - rate splitting multiple access (RSMA)

UR - https://www.scopus.com/pages/publications/105024793361

U2 - 10.1109/LCOMM.2025.3642334

DO - 10.1109/LCOMM.2025.3642334

M3 - Article

AN - SCOPUS:105024793361

SN - 1089-7798

VL - 30

SP - 472

EP - 476

JO - IEEE Communications Letters

JF - IEEE Communications Letters

ER -

BD-RIS-Aided RSMA-ISAC Systems: Joint Rate Splitting and Beamforming Design

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this