Active Reconfigurable Intelligent Surface-Assisted MISO Integrated Sensing and Communication Systems for Secure Operation

Salem, A. Abdelaziz; Ismail, Mahmoud H.; Ibrahim, Ahmed S.

doi:10.1109/tvt.2022.3227319

Cited by 47 publications

(26 citation statements)

References 39 publications

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“…When the active RIS is used to establish a virtual link between the DFRC BS and the target, a signal that would normally experience severe fading can be amplified twice on the same active RIS panel, which we refer to multiple-self-reflection (MSR). Recently, a few contributions studied the active RIS-aided ISAC system [30], [31]. Specifically, the authors of [30] considered an active RIS-aided ISAC system in the scenario of cloud radio access network (C-RAN), and optimized the Radar beampattern towards the sensing targets.…”

Section: Index Termsmentioning

confidence: 99%

“…However, the four-hop received echo was not considered in [30]. The authors of [31] employed the received Radar SINR as a sensing metric while maximizing the secure rate of the active RIS-aided ISAC system. Nevertheless, the noise and the interference induced by the active RIS were neglected in [31].…”

Section: Index Termsmentioning

confidence: 99%

“…The authors of [31] employed the received Radar SINR as a sensing metric while maximizing the secure rate of the active RIS-aided ISAC system. Nevertheless, the noise and the interference induced by the active RIS were neglected in [31]. Besides, in both [30], [31], the power consumption of the reflected echo at the active RIS was not considered.…”

Section: Index Termsmentioning

confidence: 99%

“…Nevertheless, the noise and the interference induced by the active RIS were neglected in [31]. Besides, in both [30], [31], the power consumption of the reflected echo at the active RIS was not considered. Motivated by the above background, our contributions are summarized as follows:…”

Section: Index Termsmentioning

confidence: 99%

See 3 more Smart Citations

Active RIS Aided Integrated Sensing and Communication Systems

Yu¹,

Gui²,

Hong³

et al. 2023

Preprint

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This paper considers an active reconfigurable intelligent surface (RIS)-aided integrated sensing and communication (ISAC) system. We aim to maximize Radar signal-to-interference-plus-noise-ratio (SINR) by jointly optimizing the beamforming matrix at the dual-function Radar-communication (DFRC) base station (BS) and the reflecting coefficient matrix at the active RIS subject to the quality of service (QoS) constraint of communication users (UE) and the transmit power constraints of active RIS and DFRC BS. In the proposed scenario, we mainly focus on the four-hop BS-RIS-target-RIS-BS sensing link, and the direct BS-target-BS link is assumed to be blocked. Due to the coupling of the beamforming matrix and the reflecting coefficient matrix, we use the alternating optimization (AO) method to solve the problem. Given reflecting coefficients, we apply majorization-minimization (MM) and semidefinite programming (SDP) methods to deal with the nonconvex QoS constraints and Radar SINR objective functions. An initialization method is proposed to obtain a high-quality converged solution, and a sufficient condition of the feasibility of the original problem is provided. Since the signal for sensing is reflected twice at the same active RIS panel, the Radar SINR and active RIS transmit power are quartic functions of RIS coefficients after using the MM algorithm. We then transform the problem into a sum of square (SOS) form, and a semidefinite relaxation (SDR)-based algorithm is developed to solve the problem. Finally, simulation results validate the potential of active RIS in enhancing the performance of the ISAC system compared to the passive RIS, and indicate that the transmit power and physical location of the active RIS should be carefully chosen.

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Section: Index Termsmentioning

confidence: 99%

Section: Index Termsmentioning

confidence: 99%

Section: Index Termsmentioning

confidence: 99%

Section: Index Termsmentioning

confidence: 99%

See 2 more Smart Citations

Active RIS Aided Integrated Sensing and Communication Systems

Yu¹,

Gui²,

Hong³

et al. 2023

Preprint

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“…Consequently, the active RIS/STAR-RIS is developed to overcome the multiplicative pathloss by amplifying the incident signals. In addition, several works have applied active RIS to ISAC systems, such as [30]- [32]. However, to the best of our knowledge, the utilization of active STAR-RIS to ISAC systems has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Joint Transceiver Beamforming and Reflecting Design for Active RIS-Aided ISAC Systems

Zhu

Liu

et al. 2023

IEEE Trans. Veh. Technol.

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Integrated sensing and communication (ISAC) is recognized as a promising technology with great potential in saving hardware and spectrum resources, since it simultaneously realizes radar detection and user communication functions in the fully-shared platform. Employing reconfigurable intelligent surface (RIS) in ISAC systems is able to provide a virtual lineof-sight (LoS) path to conquer blockage problem as well as introduce new degrees of freedom (DoFs) to further enhance system performance. Nevertheless, the multiplicative fading effect of passive RIS limits its applications in the absence of direct links, which promotes the development of active RIS. In this paper, we consider an active RIS-assisted ISAC system and aim to jointly design the transmit beamformer, the active RIS reflection and the radar receive filter to maximize the radar output signalto-noise ratio (SNR) while guaranteeing pre-defined signal-tointerference-plus-noise ratios (SINRs) for communication users. To solve for this non-convex problem, an efficient algorithm is developed by leveraging the techniques of block coordinate descent (BCD), Dinkelbach's transform and majorization-minimization (MM). Simulation results verify the significant advancement of deploying active RIS in ISAC systems, which can achieve up to 32dB radar SNR enhancement compared with the passive RISassisted ISAC systems.

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