Double-RIS Versus Single-RIS Aided Systems: Tensor-Based Mimo Channel Estimation and Design Perspectives

Ardah, Khaled; Gherekhloo, Sepideh; Almeida, André L. F. de; Haardt, Martin

doi:10.1109/icassp43922.2022.9746287

Cited by 22 publications

(3 citation statements)

References 11 publications

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“…The second is multi-hop multiplexing, in which multiple cascaded RISs are utilized to reflect signals for improving communicate performance. In [13], double RISs (D-RIS) assisted MIMO systems were considered, and an alternate MIMO system channel estimation method based on least squares was proposed. Compared with S-RIS systems, D-RIS can be seen as an attractive and efficient way to improve the communication coverage, capacity, and efficiency of next-generation wireless communication system.…”

Section: Related Workmentioning

confidence: 99%

Max-Min Energy-Efficiency Fair Optimization in STAR-RIS Assisted Communication System

et al. 2023

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In this paper, we investigate simultaneously transmitting and reflecting reconfigurable intelligent surfaces (STAR-RIS), which enables to communicate with users in both sides by transmitting signals to users forward and reflecting signals to users backward simultaneously. We consider a communication system with a STAR-RIS, a base station (BS) and many users to maximize the minimum user energy efficiency (EE) by jointly optimizing active beamforming, transmission and reflection coefficients with power constraint. Considering the fractional programming form of the formulated problem, we adopt Dinkelbach algorithm to transform the problem into the form of convex function subtraction, and then divide it into two sub-problems optimizing the beamforming vectors at BS and coefficient matrices at STAR-RIS separately. With the two subproblems fixed, an Alternating Optimization (AO) algorithm is proposed to solve the maximize minimum user EE fair optimization problem. Numerical results demonstrate that STAR-RIS can enhance energy and spectrum efficiency of the STAR-RIS communication system, and the proposed algorithm maximizes the minimum EE effectively to ensure user fairness.

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Section: Related Workmentioning

confidence: 99%

Max-Min Energy-Efficiency Fair Optimization in STAR-RIS Assisted Communication System

et al. 2023

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“…The RIS has been widely applied due to the channel reconstruction ability and cost-effectiveness [4][5]. Meanwhile, the capabilities have been enhanced by reflecting received signals with controllable reflection amplitudes and phases for applications such as DOA estimation [6][7] and wireless communication [8][9]. Moreover, compared to this centralized scheme, the decentralized UAV swarm is equipped with a complete functional receiver for each UAV element [10][11], enabling the UAV swarm to complete the tasks with a high probability even when some UAV elements are partially damaged.…”

Section: Introductionmentioning

confidence: 99%

Distributed UAV Swarm Augmented Wideband Spectrum Sensing Using Nyquist Folding Receiver

Jiang,

Tian,

Feng

et al. 2024

IEEE Trans. Wireless Commun.

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“…Moreover, if a wireless system is equipped with a pair of Tx-Rx RISs, both the spectral efficiency and the coverage of the system may be improved [24]. Indeed, having more RIS panels may be expected to glean more energy at the receiver, but positioning a pair of them strategically, one in the vicinity of the transmitter and one near the receiver is recommended [25]. This is because a single RIS provides good reception at the base station, but not at the destination.…”

Section: Introductionmentioning

confidence: 99%

Secrecy-Rate Optimization of Double RIS-Aided Space–Ground Networks

Hoang

Vahid

et al. 2023

IEEE Internet Things J.

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The physical layer security (PLS) of a space-ground communication system is examined. To improve the security performance, a pair of reconfigurable intelligent surfaces (RISs) is integrated into the system and benchmarked against a scheme, where there is only a single RIS close to the ground station. As for the double-RIS scenario, we formulate a secrecy rate maximization problem, and then propose an alternating optimization (AO) algorithm for jointly optimizing three vectors, namely the beamformer of the ground station and the reflecting vectors of two different RISs. Similarly, as for the single-RIS case, we also propose another AO algorithm for optimizing a pair of vectors, namely the beamformer of the ground station and the reflecting vector of the single RIS. Both the double-RIS and the single-RIS AO algorithms are developed on the basis of the first-order Taylor expansion and the Dinkelbach's method, which allow us to approximate non-convex optimization problems by convex ones. Our results demonstrate that the proposed double-RIS scheme outperforms the single-RIS benchmark scheme in terms of its security.

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Double-RIS Versus Single-RIS Aided Systems: Tensor-Based Mimo Channel Estimation and Design Perspectives

Cited by 22 publications

References 11 publications

Max-Min Energy-Efficiency Fair Optimization in STAR-RIS Assisted Communication System

Max-Min Energy-Efficiency Fair Optimization in STAR-RIS Assisted Communication System

Distributed UAV Swarm Augmented Wideband Spectrum Sensing Using Nyquist Folding Receiver

Secrecy-Rate Optimization of Double RIS-Aided Space–Ground Networks

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