Wideband precoding for RIS-aided THz communications

R Su, L Dai, DWK Ng - IEEE Transactions on Communications, 2023 - ieeexplore.ieee.org
Reconfigurable intelligent surface (RIS)-aided terahertz (THz) communication has been
considered as a promising technology for enabling future sixth-generation (6G) wireless …

Near-field channel estimation for extremely large-scale reconfigurable intelligent surface (XL-RIS)-aided wideband mmwave systems

S Yang, C **e, W Lyu, B Ning… - IEEE Journal on …, 2024 - ieeexplore.ieee.org
Near-field communications present new opportunities over near-field channels, however,
the spherical wavefront propagation makes near-field signal processing challenging. In this …

The far-/near-field beam squint and solutions for THz intelligent reflecting surface communications

W Hao, X You, F Zhou, Z Chu, G Sun… - IEEE Transactions on …, 2023 - ieeexplore.ieee.org
Terahertz (THz) and intelligent reflecting surface (IRS) have been regarded as two
promising technologies to improve the capacity and coverage for future 6G networks …

Multi-user MISO with stacked intelligent metasurfaces: A DRL-based sum-rate optimization approach

H Liu, J An, GC Alexandropoulos, DWK Ng… - arxiv preprint arxiv …, 2024 - arxiv.org
Stacked intelligent metasurfaces (SIMs) represent a novel signal processing paradigm that
enables over-the-air processing of electromagnetic waves at the speed of light. Their multi …

Scalable channel estimation and reflection optimization for reconfigurable intelligent surface-enhanced OFDM systems

J An, Q Wu, C Yuen - IEEE Wireless Communications Letters, 2022 - ieeexplore.ieee.org
This letter proposes a scalable channel estimation and reflection optimization framework for
reconfigurable intelligent surface (RIS)-enhanced orthogonal frequency division …

Time-delay unit based beam squint mitigation for RIS-aided communications

H Sun, S Zhang, J Ma, OA Dobre - IEEE Communications …, 2022 - ieeexplore.ieee.org
Reconfigurable intelligent surface (RIS) is considered as a critical technology for future
wireless communication networks. In this letter, we show that in a RIS-aided wideband THz …

Wideband beamforming for Star-RIS-assisted THZ communications with three-side beam split

W Yan, W Hao, G Sun, C Huang… - IEEE Transactions on …, 2024 - ieeexplore.ieee.org
In this paper, we consider the simultaneously transmitting and reflecting reconfigurable
intelligent surface (STAR-RIS)-assisted THz communications with three-side beam split …

Low Complexity RIS Update in OFDM Systems via RIS Element Allocation

H Cho, J Moon, J Choi - IEEE Transactions on Wireless …, 2024 - ieeexplore.ieee.org
In this paper, we propose reconfigurable intelligent surface (RIS) element allocation
algorithms that maximize the minimum rate or sum rate in a multi-user (MU)-multiple-input …

Resource Optimization in Active-STAR-RIS-Aided THz ISAC Systems with DDA Modulation: A Machine-Learning Approach

S Kurma, K Singh, S Mumtaz… - IEEE Transactions on …, 2024 - ieeexplore.ieee.org
This paper explores the state-of-the-art terahertz (THz) integrated sensing and
communication system (ISAC) that uses active reconfigurable intelligent surfaces (ASRIS) …

Beyond Diagonal Reconfigurable Intelligent Surfaces in Wideband OFDM Communications: Circuit-Based Modeling and Optimization

H Li, M Nerini, S Shen, B Clerckx - IEEE Transactions on …, 2025 - ieeexplore.ieee.org
This work investigates the modeling and optimization of beyond diagonal reconfigurable
intelligent surface (BD-RIS), which generalizes conventional RIS with diagonal phase shift …