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ARAI　Kabuto
Mathematics, Electronics and Informatics DivisionAssistant Professor
Department of Electrical Engineering,Electronics, and Applied Physics

Researcher information

■ Degree
  • Ph.D., The University of Electro-Communications
    Mar. 2026
  • M.E., Chiba University
    Mar. 2021
■ Research Keyword
  • Bayesian inference
  • Signal processing
  • MIMO
  • Wireless communications
■ Field Of Study
  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Communication and network engineering
■ Career
  • Apr. 2026 - Present, The University of Electro-Communications, Advanced Wireless Communication Research Center, Visiting Researcher
  • Apr. 2026 - Present, Saitama University, Graduate School of Science and Engineering, Assistant professor
  • Apr. 2021 - Mar. 2023, Corporate Research and Development Center, Toshiba Corporation
■ Educational Background
  • Apr. 2023 - Mar. 2026, The University of Electro-Communications, Graduate School of Informatics and Engineering
  • Apr. 2019 - Mar. 2021, Chiba University, Graduate School of Science and Engineering
  • Apr. 2017 - Mar. 2019, Chiba University, Faculty of Engineering, Department of Electrical and Electronic Engineering
  • Apr. 2015 - Mar. 2017, National Institute of Technology, Niihama College, Department of Electronic Control Engineering
■ Award
  • Aug. 2025, Symposium on Information Theory and its Applications (SITA) 2024 Young Researcher Paper Award., Bit Error Rate Analysis of Millimeter-Wave Communications Systems With Multi-Panel Array Under Stochastic Path Blockages, The Institute of Electronics, Information and Communication Engineers
    Kanta Terui, Kabuto Arai, Koji Ishibashi
  • Aug. 2025, Symposium on Information Theory and its Applications (SITA) 2024 Young Researcher Paper Award., Joint Near-field Channel and Data Estimation for Extremely Large-Scale MIMO Systems, The Institute of Electronics, Information and Communication Engineers
    Kabuto Arai;Koji Ishibashi;Hiroki Iimori;Paulo Valente Klaine;Szabolcs Malomsoky
  • May 2024, IEICE RCS Active Research Award, Near-Field Channel Estimation for Multiuser XL-MIMO Systems with Non-Orthogonal Pilots, The Institute of Electronics, Information and Communication Engineers
  • Oct. 2023, IEEE VTS Tokyo/Japan Chapter 2023 Student Paper Award, Self-Calibration for Channel Estimation in Hybrid Millimeter-Wave MIMO Systems, IEEE VTS Tokyo/Japan Chapter
    Kabuto Arai;Koji Ishibashi
  • May 2021, IEICE Communications Express (ComEX) Top Downloaded Letter Award., Prediction-Aided Precoding for Multiuser Massive MIMO Null-Space Expansion, The Institute of Electronics, Information and Communication Engineers
    Kabuto Arai;Kazuki Maruta;Chang-Jun Ahn

Performance information

■ Paper
  • Joint Channel and Data Estimation for Multiuser Extremely Large-Scale MIMO Systems　　　　　　　　　　　　　　　
    Kabuto Arai; Koji Ishibashi; Hiroki Iimori; Paulo Valente Klaine; Szabolcs Malomsoky
    IEEE Transactions on Wireless Communications, 2026, [Reviewed], [Lead, Corresponding]
    Scientific journal
    DOI：https://doi.org/10.1109/TWC.2025.3597278
    DOI ID：10.1109/TWC.2025.3597278, ORCID：190050271
  • Channel Estimation for Hybrid MIMO Systems With Array Model Errors and Beam Squint Effects　　　　　　　　　　　　　　　
    Kabuto Arai; Koji Ishibashi
    IEEE Transactions on Vehicular Technology, Nov. 2025, [Reviewed], [Lead, Corresponding]
    Scientific journal
    DOI：https://doi.org/10.1109/TVT.2025.3579497
    DOI ID：10.1109/TVT.2025.3579497, ORCID：197608430
  • 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 Transactions on Vehicular Technology, 2025, [Reviewed]
    Scientific journal
    DOI：https://doi.org/10.1109/TVT.2025.3539399
    DOI ID：10.1109/TVT.2025.3539399, ORCID：178028847
  • QRD-Based Precoding Design for Multiuser Massive MIMO Null-Space Expansion
    Yuki Sasaki; Kabuto Arai; Kazuki Maruta
    IEICE Communications Express, Volume：13, Number：12, First page：509, Last page：512, Dec. 2024, [Reviewed]
    Institute of Electrical and Electronics Engineers (IEEE), English, Scientific journal
    DOI：https://doi.org/10.23919/comex.2024xbl0150
    DOI ID：10.23919/comex.2024xbl0150, eISSN：2187-0136
  • Robust Beamforming With Multi-Panel Array for mmWave Channels Over Mobility and Blockage
    Kanta Terui; Kabuto Arai; Koji Ishibashi
    2024 IEEE 100th Vehicular Technology Conference (VTC2024-Fall), First page：1, Last page：5, Oct. 2024, [Reviewed]
    IEEE, English, International conference proceedings
    DOI：https://doi.org/10.1109/vtc2024-fall63153.2024.10757745
    DOI ID：10.1109/vtc2024-fall63153.2024.10757745
  • Beam-Space Expansion with Broad-Range Null-Steering for V2I Multiuser MIMO Transmission　　　　　　　　　　　　　　　
    Yuki Sasaki; Sojin Ozawa; Kabuto Arai; Jin Nakazato; Manabu Tsukada; Kazuki Maruta
    Proc. ASPIRE Workshop, Mar. 2024, [Reviewed]
    English
    DOI：https://doi.org/10.34385/proc.80.P-8
    DOI ID：10.34385/proc.80.P-8
  • Boolean Compressed Sensing with Cluster Sparsity for Anomaly Detection in Large-Scale Wireless Sensor Networks　　　　　　　　　　　　　　　
    Masaki ARAI; Kabuto ARAI; Koji ISHIBASHI
    Proc. ASPIRE Workshop, Mar. 2024, [Reviewed]
    English
    DOI：https://doi.org/10.34385/proc.80.P-6
    DOI ID：10.34385/proc.80.P-6
  • Channel Estimation for Millimeter-Wave MIMO in the Presence of Array Model Errors　　　　　　　　　　　　　　　
    Kabuto Arai; Koji Ishibashi
    Proc. ASPIRE Workshop, Mar. 2024, [Reviewed], [Lead]
    International conference proceedings
    DOI：https://doi.org/10.34385/proc.80.P-1
    DOI ID：10.34385/proc.80.P-1
  • Location-Based Broad-Range Null-Steering in V2X Multiuser MIMO Transmission　　　　　　　　　　　　　　　
    Yuki Sasaki; Sojin Ozawa; Kabuto Arai; Jin Nakazato; Manabu Tsukada; Kazuki Maruta
    2024 IEEE 21ST CONSUMER COMMUNICATIONS & NETWORKING CONFERENCE, CCNC, First page：1070, Last page：1071, 2024, [Reviewed]
    English, International conference proceedings
    DOI：https://doi.org/10.1109/CCNC51664.2024.10454730
    DOI ID：10.1109/CCNC51664.2024.10454730, ISSN：2331-9852, Web of Science ID：WOS:001192142600239
  • Time-Series-Aware User Scheduling for Multi-user Massive MIMO Null-Space Expansion　　　　　　　　　　　　　　　
    Yuki Sasaki; Kabuto Arai; Jin Nakazato; Kazuki Maruta
    2024 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS WORKSHOPS, ICC WORKSHOPS 2024, First page：341, Last page：346, 2024, [Reviewed]
    English, International conference proceedings
    DOI：https://doi.org/10.1109/ICCWORKSHOPS59551.2024.10615503
    DOI ID：10.1109/ICCWORKSHOPS59551.2024.10615503, ISSN：2164-7038, Web of Science ID：WOS:001296276700058
  • Near-Field Channel Estimation for Uplink Multiuser XL-MIMO Systems　　　　　　　　　　　　　　　
    Kabuto Arai; Koji Ishibashi; Hiroki Iimori; Paulo Valente Klaine; Szabolcs Malomsoky
    2024 IEEE 25TH INTERNATIONAL WORKSHOP ON SIGNAL PROCESSING ADVANCES IN WIRELESS COMMUNICATIONS, SPAWC 2024, First page：256, Last page：260, 2024, [Reviewed], [Lead]
    English, International conference proceedings
    DOI：https://doi.org/10.1109/SPAWC60668.2024.10694451
    DOI ID：10.1109/SPAWC60668.2024.10694451, ISSN：1948-3244, Web of Science ID：WOS:001337964100052
  • Self-Calibration for Channel Estimation in Hybrid Millimeter-Wave MIMO Systems　　　　　　　　　　　　　　　
    Kabuto Arai; Koji Ishibashi
    2023 IEEE 98TH VEHICULAR TECHNOLOGY CONFERENCE, VTC2023-FALL, 2023, [Reviewed], [Lead]
    English, International conference proceedings
    DOI：https://doi.org/10.1109/VTC2023-Fall60731.2023.10333598
    DOI ID：10.1109/VTC2023-Fall60731.2023.10333598, ISSN：2577-2465, Web of Science ID：WOS:001133762500215
  • Prediction-aided precoding for multiuser massive MIMO null-space expansion
    Kabuto Arai; Kazuki Maruta; Chang-Jun Ahn
    IEICE Communications Express, Volume：10, Number：5, First page：212, Last page：218, May 2021, [Reviewed], [Lead, Corresponding]
    Institute of Electrical and Electronics Engineers (IEEE), English, Scientific journal
    DOI：https://doi.org/10.1587/comex.2021xbl0012
    DOI ID：10.1587/comex.2021xbl0012, eISSN：2187-0136
  • 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
    2020 23RD INTERNATIONAL SYMPOSIUM ON WIRELESS PERSONAL MULTIMEDIA COMMUNICATIONS (WPMC 2020), 2020, [Reviewed], [Lead]
    English, International conference proceedings
    DOI：https://doi.org/10.1109/wpmc50192.2020.9309504
    DOI ID：10.1109/wpmc50192.2020.9309504, ISSN：1347-6890, Web of Science ID：WOS:000680396600054
  • 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, [Reviewed], [Lead, Corresponding]
    Scientific journal
    DOI：https://doi.org/10.1109/ACCESS.2020.3044053
    DOI ID：10.1109/ACCESS.2020.3044053, ORCID：166175345
■ Affiliated academic society
  • May 2020 - Present, IEEE
  • Dec. 2019 - Present, The Institute of Electronics, Information and Communication Engineers
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