EN JP

Access

Wireless Networks

Research Center

(Yokosuka, Kanagawa)

RESEARCHER

＞＞ SAWADA Hirokazu

SAWADA Hirokazu

Ph.D.

Position

Research Manager

Post

Wireless Systems Laboratory

Publications

Nov. 2025 Zhao, Ou; Shan, Lin; Li, Huan-Bang; Sawada, Hirokazu; Matsuo, Daisuke; Fuwa, Yasushi; Matsumura, Takeshi; "Geographic Knowledge-Driven Transfer Learning for Enhanced Received Signal Strength Prediction," IEEE Transactions on Cognitive Communications and Networking, vol. 12, pp. 4448-4462, Nov. 2025.
[ DOI ] Jan. 2025 Haniz, Azril; Kawasaki, Hikaru; Hosokawa, Genki; Urushibata, Takuro; Yanagi, Yasuyuki; Kunitachi, Tadahide; Sawada, Hirokazu; Matsumura, Takeshi; "Multipath parameter optimization for improving accuracy of ray-tracing-based received power prediction in industrial environments," IEEE Transactions on Vehicular Technology, vol. 74, No.5, pp. 7881-7896, Jan. 2025.
[ DOI ] Aug. 2024 Sakamoto, Kensuke; Sakaguchi, Ayaka; Yamakawa, Yuki; Mimura, Waka; Sawada, Hirokazu; Haniz, Azril; Kojima, Fumihide; Matsumura, Takeshi; "Path loss model from 922MHz to 28GHz in office environment" IEICE Communications Express, vol.13 No.10 pp.417-420, Aug. 2024.
[ DOI ] Apr. 2024 Shirakawa, Masayuki; Furukawa, Rei; Ching, Gilbert; Horihata, Kenshi; Kishiki, Yukiko; Sawada, Hirokazu; Haniz, Azril; Matsumura, Takeshi; Murakami, Homare; Kojima, Fumihide; "Path clustering for radio propagation prediction with moving object in indoor environment," IEEE Access, vol.12, No.2, pp.59007-59017, Apr. 2024.
[ DOI ] Dec. 2023 Pyo, Changwoo; Sawada, Hirokazu; Matsumura, Takeshi; "A deep learning-based indoor radio estimation method driven by 2.4 GHz ray-tracing data," IEEE Access, vol. 11, pp. 138215-138228, Dec. 2023.
[ DOI ] Sep. 2022 Shirakawa, Masayuki; Furukawa, Rei; Ching, Gilbert; Kishiki, Yukiko; Sawada, Hirokazu; Matsumura, Takeshi; Kojima, Fumihide; "Path clustering and calculation of shielding effect for dynamic indoor environment simulation," IEICE Communications Express, vol. 11, No. 9, pp. 596-600, Sep. 2022.
[ DOI ] Oct. 2021 Iigusa, Kyoichi; Sawada, Hirokazu; Matsumura, Takeshi; Kojima, Fumihide; "Wideband strip antenna surrounding a ground plate," The Journal of Engineering, vol. 2022, No. 1, pp. 34-43, Oct. 2021.
[ DOI ] Nov. 2018 Ohara, Hiroki; Sawada, Hirokazu; Oodo, Masayuki; Kojima, Fumihide; Harada, Hiroshi; Saito, Kentaro; Takada, Jun-ichi; "Characterization of Broadband Mobile Communication Channel in 200MHz Band Based on Saleh-Valenzuela Model," IEICE Transactions on Communications, vol. 101, No. 11, pp.2277-2288, Nov. 2018.
[ DOI ] July 2018 Iigusa, Kyoichi; Sawada, Hirokazu; Kojima, Fumihide; "Omni-directional small planar antenna composed of folded slots spanning over both sides," IEICE Communications Express, vol. 7, No. 7, pp.284-290, July 2018.
[ DOI ] Jan. 2018 Iigusa, Kyoichi; Sawada, Hirokazu; Kojima, Fumihide; Harada, Hiroshi; "Wideband Rectangular Antenna Fed Sideways from a Ground Plate," IEICE Transactions on Communications, vol. 101, No. 1, pp.176-184, Jan. 2018.
[ DOI ] Dec. 2017 Iigusa, Kyoichi; Sawada, Hirokazu; Kojima, Fumihide; "Approximate relations of admittance for symmetrically arranged dipoles," IEEE Transactions on Antennas and Propagation, vol. 66, No. 2, pp.984-989, Dec. 2017.
[ DOI ] Nov. 2016 Sawada, Hirokazu; Fujii, Katsumi; Kasamatsu, Akifumi; Ogawa, Hiroyo; Ishizu, Kentaro; Kojima, Fumihide; "Path loss model at 300 GHz for indoor mobile service applications," IEICE Communications Express, vol. 5, No. 11, pp.424-428, Nov. 2016.
[ DOI ] July 2016 Iigusa, Kyoichi; Sawada, Hirokazu; Kojima, Fumihide; Yano, Hiroyuki; "Wideband monopole antenna tightly aligned to the ground plate," The Journal of Engineering, vol. 2016, No. 7, pp.230-236, July 2016.
[ DOI ] June 2016 Iigusa, Kyoichi; Sawada, Hirokazu; Kojima, Fumihide; Harada, Hiroshi; Yano, Hiroyuki; "Efficiency degradation of short‐distance wireless power transmission by distance alignment error," IET Microwaves, Antennas & Propagation, vol. 10, No. 9, pp.947-954, June 2016.
[ DOI ] Jan. 2013 Sawada, Hirokazu; Takahashi, Shunya; Kato, Shuzo; "Disconnection probability improvement by using artificial multi reflectors for millimeter-wave indoor wireless communications," IEEE transactions on antennas and propagation, vol. 61, No. 4, pp.1868-1875, Jan. 2013.
[ DOI ] Sep. 2009 Sawada, Hirokazu; Nakase, Hiroyuki; Sato, Katsuyoshi; Harada, Hiroshi; "A sixty GHz vehicle area network for multimedia communications," IEEE Journal on Selected Areas in Communications, vol. 27, No. 8, pp.1500-1506, Sep. 2009.
[ DOI ] Aug. 2009 Shoji, Yozo; Sawada, Hirokazu; Choi, Chang-Soon; Ogawa, Hiroyo; "A modified SV-model suitable for line-of-sight desktop usage of millimeter-wave WPAN systems," IEEE Transactions on Antennas and Propagation, vol. 57, No. 10, pp.2940-2948, Aug. 2009.
[ DOI ] Dec. 2007 Yoneyama, Tsukasa; Sawada, Hirokazu; Shimizu, Takashi; "NRD-guide passive components and devices for millimeter wave wireless applications," IEICE transactions on electronics, vol. 90, No. 12, pp.2170-2177, Dec. 2007.
[ DOI ]

CONTACT

If you have any questions for the Wireless Systems Lab., please contact us by using our inquiry form.

Inquiry Form

TOP NICT TOP Site Map Site Policy Privacy Policy

Twitter

Go to Top MENU × TOP About Us About Us News & Information Research Projects Research Projects Challenges to Use RF Signals in Underwater Command Hopper & Drone Mapper Device-to-Device (D2D) Communications Impulse-Radio Ultra-WideBand (IR-UWB) Local 5G System Simultaneous Transmission Access Boosting Low-latEncy (STABLE) Wireless Emulator Wireless Grid Researchers Achievements Press Releases Publications Videos Technology Transfer Closer to You Collaborations Employment Events Twitter Access Access Wireless Networks Research Center NICT Headquarters Kashima Space Technology Center Contact Links Wireless Networks Research Center Space Communication Systems Laboratory