Optimal Grouping Strategy for Reconfigurable Intelligent Surface Assisted Wireless Communications

Kundu, Neel Kanth; Li, Zan; Rao, Junhui; Shen, Shanpu; McKay, Matthew R.; Murch, R.D.

doi:10.48550/arxiv.2111.10550

Cited by 2 publications

(3 citation statements)

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“…Remark 1. When each port is disconnected with other ports in the reconfigurable impedance network, the fully connected RIS reduces to the single connected RIS [31] as illustrated in Fig. 1 (b).…”

Section: A Fully Connected Reconfigurable Intelligent Surfacementioning

confidence: 99%

Fully Connected Reconfigurable Intelligent Surface Aided Rate-Splitting Multiple Access for Multi-User Multi-Antenna Transmission

Fang¹,

Mao²,

Shen³

et al. 2022

Preprint

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Rate-splitting multiple access (RSMA) has been recognized as a promising and powerful multiple access (MA) scheme, non-orthogonal transmission framework and interference management strategy for 6G. Inspired by the appealing spectral efficiency gain achieved by RSMA over conventional MA schemes in multi-user multi-antenna transmission, in this paper we introduce RSMA to reconfigurable intelligent surface (RIS)aided multiple-input single-out (MISO) broadcast channel (BC). To further enhance the spectral efficiency, a more generalized RIS architecture called fully connected RIS is considered. By jointly optimizing the scattering matrix of the fully connected RIS and the transmit beamformers to maximize the sum-rate, we show that the proposed fully connected RIS aided RSMA transmission scheme significantly improves the spectral efficiency compared with the conventional single connected RIS schemes and the schemes without RIS. It acts as a new benchmark for linearly precoded multi-user multi-antenna networks.

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Section: A Fully Connected Reconfigurable Intelligent Surfacementioning

confidence: 99%

Fully Connected Reconfigurable Intelligent Surface Aided Rate-Splitting Multiple Access for Multi-User Multi-Antenna Transmission

Fang¹,

Mao²,

Shen³

et al. 2022

Preprint

Self Cite

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“…The y i can be selected to provide whatever desired characteristics required [11], [24]. In this work we demonstrate the RIS performance by using the situation in which an incident plane wave is reflected towards a specified beam angle Ω beam = (θ, φ) beam .…”

Section: A Passive Beamforming Designmentioning

confidence: 99%

“…As a compromise, the number of reconfigurable states of the meta-atom can be reduced [22] to only 2 to 4. Furthermore, another solution that groups some meta-atoms together as a single element has also been proposed to reduce the complexity of the controlling circuits by tradeoffs in reconfigurability and performance [23], [24]. Despite solutions to reduce the complexity, the remaining complexity of this approach due to the high density of metaatoms still sets significant requirements on the controlling system in practical applications of RIS.…”

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confidence: 99%

A Novel Reconfigurable Intelligent Surface for Wide-Angle Passive Beamforming

Rao¹,

Zhang²,

Tang³

et al. 2022

Preprint

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A design for a highly reconfigurable intelligent surface (RIS) that can provide three-dimensional passive reflective beamforming suitable for sub-6 GHz frequency bands is proposed. The RIS is based on a novel double-layer structure consisting of independently controllable and highly reconfigurable elements on top of a ground plane. The novelty of the structure is the use of reconfigurable RIS elements, whose size is of the order of a wavelength, that are optimized to function over wide incident and reflected angles. In addition, the individual elements each have four RF switches, in a 5x5 sub-element structure, providing 16 different reflective phases, from 0 to 360 degrees relative to the incident waves. To quantify the performance of the RIS, the performance metric of phase entropy is defined and it is also utilized as an objective function for optimizing the design. An efficient analytical method for predicting the reflected waves from the RIS elements, as well as phase entropy, is also provided. For verification, a prototype of a 4x4-element RIS, with a total size of 0.32x0.34 m<sup>2</sup>, is fabricated and an experimental setup for measuring the scattered pattern is described. It is shown that waves incident from various angles can be passively beam steered to any angle within 0-360 degrees azimuth and 70 degrees elevation angles. The high reconfigurability to manipulate incident waves makes the proposed RIS a promising surface for use in future high-capacity communication systems.

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Optimal Grouping Strategy for Reconfigurable Intelligent Surface Assisted Wireless Communications

Cited by 2 publications

References 0 publications

Fully Connected Reconfigurable Intelligent Surface Aided Rate-Splitting Multiple Access for Multi-User Multi-Antenna Transmission

Fully Connected Reconfigurable Intelligent Surface Aided Rate-Splitting Multiple Access for Multi-User Multi-Antenna Transmission

A Novel Reconfigurable Intelligent Surface for Wide-Angle Passive Beamforming

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