Wencai Yan

Differential Reflecting Frequency Modulation with QAM for RIS-Based Communications

Yajun Fan, Le Zhao, Wencai Yan, Haihua Ma

Reconfigurable intelligent surface (RIS)-aided index modulation (IM) shows great potential for next-generation wireless communications. Nevertheless, obtaining channel state information (CSI) for RIS-based IM incurs high pilot overhead, particularly for multi-domain IM. In this paper, we integrate orthogonal frequency division multiplexing into RIS-aided …

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Intelligent Reflecting Surfaces for THz Communications: Fundamentals, Key Solutions, and System Prototyping

Qingqing Wu, Yanze Zhu, Qiaoyan Peng, Wanming Hao et autres

Intelligent reflecting surfaces (IRSs) have emerged as a cost-effective technology for terahertz (THz) communications by enabling programmable control of the wireless environment. This paper provides a comprehensive overview of IRSs-aided THz communications, covering hardware designs, advanced signal processing techniques, and practical deployment …

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6-D Movable Antenna-Enabled Wideband THz Communications

Wencai Yan, Wanming Hao, Yajun Fan, Yabo Guo et autres

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High-rate QAM-aided differential spatial frequency modulation

Yajun Fan, Wencai Yan, Zhao Le, Haihua Ma et autres

Differential spatial frequency modulation (DSFM) represents a novel multiple-input-multiple-output transmission technique. It utilizes subcarriers and transmitting antenna index matrices to convey part of the information in non-coherent communication scenarios. However, when high-order modulation is necessary for spectral-efficiency purposes, the traditional application of …

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DAF-Aided ISAC Spatial Scattering Modulation for Multi-Hop V2V Networks

Yajun Fan, Jiaqi Wu, Yabo Guo, Jing Yang et autres

Integrated sensing and communication (ISAC) has emerged as a transformative technology for intelligent transportation systems. Index modulation (IM), recognized for its high robustness and energy efficiency (EE), has been successfully incorporated into ISAC systems. However, most existing IM-based ISAC schemes overlook the …

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Near-Field THz ISAC Systems With Reconfigurable Antenna Architecture

Wencai Yan, Wanming Hao, Qingqing Wu, Yajun Fan et autres

In this paper, we investigate the near-field wideband terahertz (THz) massive multi-input multi-output (MIMO) integrated sensing and communication (ISAC) systems. Specifically, we propose an energy-efficient serial true-time-delay (TTD)-based reconfigurable antenna architecture for the dual-function base station (DFBS). This architecture enables DFBS to …

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Wideband Beamforming for STAR-RIS-Assisted THz Communications With Three-Side Beam Split

Wencai Yan, Wanming Hao, Gangcan Sun, Chongwen Huang et autres

In this paper, we consider the simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS)-assisted THz communications with three-side beam split. Except for the beam split at the base station (BS), we analyze the double-side beam split at the STAR-RIS for the first …

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Beamforming Design for the Distributed RISs-Aided THz Communications With Double-Layer True Time Delays

Gangcan Sun, Wencai Yan, Wanming Hao, Chongwen Huang et autres

In this article, we investigate the reconfigurable intelligent surface (RIS)-aided terahertz (THz) communication system with the sparse radio frequency chains antenna structure at the base station (BS). To overcome the beam split of the BS, different from the conventional single-layer true-time-delay (TTD) …

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Beamforming Design for the Distributed RISs-aided THz Communications with Double-Layer True Time Delays

Gangcan Sun, Wencai Yan, Wanming Hao, Chongwen Huang et autres

In this paper, we investigate the reconfigurable intelligent surface (RIS)-aided terahertz (THz) communication system with the sparse radio frequency chains antenna structure at the base station (BS). To overcome the beam split of the BS, different from the conventional single-layer true-time-delay (TTD) …

Wideband Beamforming for STAR-RIS-assisted THz Communications with Three-Side Beam Split

Wencai Yan, Wanming Hao, Gangcan Sun, Chongwen Huang et autres

In this paper, we consider the simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS)-assisted THz communications with three-side beam split. Except for the beam split at the base station (BS), we analyze the double-side beam split at the STAR-RIS for the first …

Beamforming Analysis and Design for Wideband THz Reconfigurable Intelligent Surface Communications

Wencai Yan, Wanming Hao, Chongwen Huang, Gangcan Sun et autres

Reconfigurable intelligent surface (RIS)-aided terahertz (THz) communications have been regarded as a promising candidate for future 6G networks because of its ultra-wide bandwidth and ultra-low power consumption. However, there exists the beam split problem, especially when the base station (BS) or RIS …

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Beamforming Analysis and Design for Wideband THz Reconfigurable Intelligent Surface Communications

Wencai Yan, Wanming Hao, Chongwen Huang, Gangcan Sun et autres

Reconfigurable intelligent surface (RIS)-aided terahertz (THz) communications have been regarded as a promising candidate for future 6G networks because of its ultra-wide bandwidth and ultra-low power consumption. However, there exists the beam split problem, especially when the base station (BS) or RIS …