Ultra Wideband THz IRS Communications: Applications, Challenges, Key Techniques, and Research Opportunities

Article Engineering, Electrical & Electronic

Terahertz Multi-User Massive MIMO With Intelligent Reflecting Surface: Beam Training and Hybrid Beamforming

Boyu Ning et al.

Summary: Terahertz (THz) communications offer wider bandwidth but face challenges of path attenuation and diffraction due to the short length of THz waves. By combining MIMO and IRS techniques, and implementing a cooperative beam training scheme, the obstacles of propagation loss and low-cost beamforming can be addressed effectively.

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY (2021)

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Article Computer Science, Information Systems

Decentralized Beamforming Design for Intelligent Reflecting Surface-Enhanced Cell-Free Networks

Shaocheng Huang et al.

Summary: In this study, a decentralized cooperative beamforming framework for cell-free networks aided by intelligent reflecting surfaces (IRS) is proposed to increase system sum-rate efficiently. The proposed method outperforms existing decentralized methods and asymptotically approaches the performance of centralized optimization as the number of iterations increases.

IEEE WIRELESS COMMUNICATIONS LETTERS (2021)

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Article Engineering, Electrical & Electronic

Wideband Beamforming for Hybrid Massive MIMO Terahertz Communications

Feifei Gao et al.

Summary: In this paper, two wideband hybrid beamforming approaches are proposed to address the beam squint issue in massive MIMO systems, based on virtual sub-array and TTD lines respectively. These methods enhance beamforming performance and resolve hardware implementation contradiction.

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS (2021)

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Article Engineering, Electrical & Electronic

Wideband Beam Tracking in THz Massive MIMO Systems

Jingbo Tan et al.

Summary: In this paper, a beam zooming based beam tracking scheme is proposed for THz massive MIMO systems, using a delay-phase precoding structure. The scheme allows the base station to simultaneously track multiple users' physical directions and achieve near-optimal achievable sum-rate performance.

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS (2021)

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Article Engineering, Electrical & Electronic

SS-OFDMA: Spatial-Spread Orthogonal Frequency Division Multiple Access for Terahertz Networks

Bangzhao Zhai et al.

Summary: A novel approach for efficient multiple access in Terahertz networks is proposed in this paper, addressing the issue of narrow angular coverage through a hybrid beamforming architecture and spatial-spread OFDMA scheme. By utilizing user grouping and non-uniform beam spreading mechanisms, it is possible to increase data rates, reduce power consumption, and enhance the number of concurrently served users.

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS (2021)

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Article Computer Science, Information Systems

UAV-Assisted and Intelligent Reflecting Surfaces-Supported Terahertz Communications

Yijin Pan et al.

Summary: The joint optimization of UAV's trajectory, IRS phase shift, THz sub-band allocation, and power control significantly enhances the rate performance of the whole system in supporting terahertz communications.

IEEE WIRELESS COMMUNICATIONS LETTERS (2021)

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Article Engineering, Electrical & Electronic