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
A comprehensive System-Level Simulation framework for assessing the performance of multi-user multiple-input multiple-output (MIMO) systems in indoor hotspot environments, following the standardized 3rd generation partnership project (3GPP) InH_B channel model is proposed.
T. Van Le, Nam Van Dinh, Ngoc-Thanh Nguyen et al.· Advanced Information and Com...· 0 citations
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
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
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
Near-field simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) systems enable full-space coverage, but dense multiuser operation requires active-user grouping under practical stream or RF-chain constraints. Gain-based or proportional-fair scheduling may over-serve strong users, whil...
T. Van Le, Trong-Dai Hoang· IEEE Wireless Communications...· 0 citations
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