High Beamforming Gain Precoding Weight Design Scheme with Null-Space Expansion for Multiuser Massive MIMO in Time-Varying Channels. - Kabuto Arai; Kazuki Maruta; Chang-Jun Ahn (WPMC, 2020)

Uplink Null-Space Expansion for Multiuser Massive MIMO in Time-Varying Channels Under Unknown Interference. - Kabuto Arai; Kazuki Maruta; Chang-Jun Ahn (IEEE Access, 2020)

Self-Calibration for Channel Estimation in Hybrid Millimeter-Wave MIMO Systems. - Kabuto Arai; Koji Ishibashi (VTC Fall, 2023)

Location-Based Broad-Range Null-Steering in V2X Multiuser MIMO Transmission. - Yuki Sasaki; Sojin Ozawa; Kabuto Arai; Jin Nakazato; Manabu Tsukada; Kazuki Maruta (CCNC, 2024)

Time-Series-Aware User Scheduling for Multi-user Massive MIMO Null-Space Expansion. - Yuki Sasaki; Kazuki Maruta; Kabuto Arai; Jin Nakazato (ICC Workshops, 2024)

Near-Field Channel Estimation for Uplink Multiuser XL-MIMO Systems. - Kabuto Arai; Koji Ishibashi; Hiroki Iimori; Paulo Valente Klaine; Szabolcs Malomsoky (SPAWC, 2024)

Robust Beamforming With Multi-Panel Array for mmWave Channels Over Mobility and Blockage. - Kanta Terui; Kabuto Arai; Koji Ishibashi (VTC Fall, 2024)

Receiver Maximum Eigenmode Beamforming-Based Null-Space Expansion for Multi-User Massive MIMO in Time-Varying Channel. - Yuki Sasaki; Kabuto Arai; Jin Nakazato; Kazuki Maruta (IEEE Trans. Veh. Technol., 2025)