This letter proposes a hybrid cascaded reconfigurable intelligent surface (RIS) architecture for downlink non-orthogonal multiple access (NOMA)-enabled integrated sensing and communication (ISAC) systems with a dual-functional radar-communication (DFRC) base station, where a passive RIS assists both sensing and phase control while an active RIS provides signal amplification. By jointly optimizing the cascaded passive-active RIS coefficients and NOMA beamforming under radar signal-to-noise ratio (SNR) constraints, we develop a low-complexity alternating optimization framework based on weighted minimum mean-square error (WMMSE), penalty method, and rotation phase algorithm. Closed-form solutions are derived for the active RIS amplification coefficients. Simulation results demonstrate that the proposed scheme achieves superior weighted sum-rate and sensing performance compared to dual-passive RIS and orthogonal multiple access (OMA) baselines, revealing a favorable sensing-communication tradeoff.
This paper investigates a downlink integrated sensing and communication (ISAC) system utilizing non-orthogonal multiple access (NOMA), empowered by an active simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) operating in energy splitting mode. We maximize the communication sum rat...
Noureen Khan, Muhammad Rehman, Jinho Choi et al.· IEEE Transactions on Wireles...· 0 citations
This letter investigates the sensing-centric design of reconfigurable intelligent surface (RIS)-enabled rate-splitting multiple access-integrated sensing and communication (RSMA-ISAC) systems. Specifically, we propose a new beam-gain approximation method to enhance the sensing beam gain while satisfying communication q...
Xue-Jun Cheng, Qian Zhang, Y. Jiao et al.· IEEE Wireless Communications...· 1 citation
In this paper, we investigate the covert communication performance and sensing performance of integrated sensing and communication (ISAC) systems enhanced by simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS). A novel non-orthogonal multiple access (NOMA) enabled covert framework i...
Zheng Yang, Hao-Yang Li, Gao-Jie Chen et al.· IEEE Transactions on Wireles...· 1 citation
Simultaneous wireless information and power transfer (SWIPT) has become a key enabler for sustaining energy-constrained Internet-of-Things (IoT) devices, while simultaneous transmission and reflection reconfigurable intelligent surfaces (STAR-RIS) provide enhanced coverage and beamforming flexibility by serving users o...
Anh-Tu Le, Thai-Hoc Vu, T. N. Nguyen et al.· IEEE Transactions on Communi...· 0 citations
Transmissive reconfigurable intelligent surfaces (T-RISs) integrated into the transmitter provide a viable realization of tri-hybrid multiple-input multiple-output (MIMO), where spatial processing is distributed across the digital, analog radio-frequency (RF), and electromagnetic (EM) domains. However, unlike conventio...
Hongtao Zhang, Chen-Long Ding· 0 citations
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