Joint Transmit and Reflect Beamforming Design for Active-RIS-Assisted Secure ISAC Systems

A secure integrated sensing and communication (ISAC) system enhanced by an active reconfigurable intelligent surface (RIS) is investigated in the letter. Unlike existing works, the proposed fairness-aware beamforming framework jointly ensures fair multi-target detection and secure multi-user communi...

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Bibliographic Details
Published inIEEE communications letters Vol. 29; no. 8; pp. 1769 - 1773
Main Authors Wu, Zhaoyu, Zhang, Wei
Format Journal Article
LanguageEnglish
Published IEEE 01.08.2025
Subjects
active reconfigurable intelligent surface (RIS)
Array signal processing
Integrated sensing and communication
Integrated sensing and communication (ISAC)
Linear programming
Optimization
physical layer security (PLS)
Radar
Reconfigurable intelligent surfaces
Security
Training
Vectors
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Summary:A secure integrated sensing and communication (ISAC) system enhanced by an active reconfigurable intelligent surface (RIS) is investigated in the letter. Unlike existing works, the proposed fairness-aware beamforming framework jointly ensures fair multi-target detection and secure multi-user communication. The objective is to maximize the minimum beampattern gain across target directions, subject to constraints on secure transmission, power budgets, active RIS reflection coefficients, and the noise introduced by the active RIS. To solve this non-convex problem, an alternating optimization (AO) algorithm that leverages penalty-enhanced successive convex approximation (SCA) is developed, which enhances beamforming gain and angular uniformity over standard semidefinite relaxation (SDR). Simulation results confirm the superior performance of the proposed design scheme compared to existing baseline schemes.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2025.3572794