Author

Ngo Hoang Tu

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Preprint Sep 2026

Feedback-Efficient Beam-User Association for Near-Field mmWave Hybrid Beamforming Systems

Near-field multiuser hybrid beamforming (HBF) requires joint angle-distance codebooks whose size, and hence reporting overhead, grows with the array aperture. For the extremely large array considered here, reporting one quality metric per codeword already incurs more overhead than full channel state information (CSI) f...

T. Van Le, Ngoc-Thanh Nguyen, Nam Van Dinh et al. · 0 citations

Review Oct 2026

6G as It Is Actually Being Built: Insights from Early 3GPP Standardization

This article asks what the first body of agreed 6G material tells us, and reviews service requirements, system architecture, the emerging radio interface, native AI, ISAC, non-terrestrial networks (NTN), and core-network protocols, tracing how each moves from study item toward specification.

Ngo Hoang Tu, H. T. Nguyen, Mao V. Ngo et al. · 0 citations

Preprint Sep 2026

Active STAR-RIS-Aided RSMA IoT Systems: Performance Analysis, Model-Based and Data-Driven Resource Allocation Frameworks

STAR-RISs have emerged as a promising technology for achieving full-space signal coverage with low hardware complexity and energy consumption. In parallel, RSMA offers a flexible interference management mechanism that enhances spectral efficiency and user fairness. Integrating STAR-RIS with RSMA provides strong potenti...

Ngo Hoang Tu, Bao Nguyen Quoc Vo, T. Tran · 0 citations

Preprint Sep 2026

OTFS-Enabled Delayed SINR-Feedback Power Control for Reliable and Fair High-Mobility UAV Communications

Simulations show that the effective SINR of OTFS changes 37.8% less per frame than that of orthogonal frequency division multiplexing (OFDM) at 70 m/s under the same numerology, and that the waveform contribution to the usefulness of stale SINR feedback increases with mobility.

T. Van Le, Luong Cong Nguyen, Trong-Dai Hoang et al. · 0 citations

Preprint Sep 2026

Mobility- and Feedback-Aware Multi-Level Conflict-Triggered Hybrid Beamforming for Multi-User mmWave UAV Systems

This paper proposes a mobility- and feedback-aware multi-level refinement strategy, termed MLR-TG, to improve robustness without always-on candidate search for multi-user large multiple-input multiple-output millimeter-wave unmanned aerial vehicle (UAV) downlink systems under mobility-induced channel aging and delayed...

T. Van Le, Luong Cong Nguyen, Xing-Wang Li et al. · 0 citations

Review Aug 2026

Hybrid Beamforming in Non-Terrestrial Networks: Architectures, Design Challenges, and Opportunities

A systematic review of HBF techniques for NTN systems, with emphasis on LEO satellite and UAV communications, and introduces common HBF architectures, signal models, channel representations, analog and digital precoder designs, and learning-aided approaches that form the shared technical foundation of existing works.

T. Van Le, Luong Cong Nguyen, H. T. Nguyen et al. · 0 citations