Papers - OKAMOTO Eiji

Study on performance improvement of information reconciliation for continuous quantum key distribution by CRC-concatenated polar codes

IEICE Tech. Rep.   125 ( 12 )   SAT2025-4, 16 - 21   2025.04

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

Other Link： https://ken.ieice.org/ken/paper/202504240c9f/

A complexity-reduction sub-terahertz image sensing method using adaptive signal processing Reviewed

T. Kurahashi, E. Okamoto

IEICE Communications Express   14 ( 2 )   79 - 82   2025.02

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.23919/comex.2024XBL0187

Other Link： https://doi.org/10.23919/comex.2024XBL0187

Study on Low-Complexity Hazardous Material Identification Method Using Density-Based Clustering in Sub-THz-band Imaging

IEICE Tech. Rep.   124 ( 366 )   RCS2024-214, 31 - 36   2025.01

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

Other Link： https://ken.ieice.org/ken/paper/202501290chZ/

Study on adaptability improvement of early HARQ retransmission control method for low-latency communications

IEICE Tech. Rep.   124 ( 366 )   RCS2024-229, 116 - 121   2025.01

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

Other Link： https://ken.ieice.org/ken/paper/20250129UchU/

Overview of non-terrestrial networks and application of optical satellite data relay system Invited

IEICE Tech. Rep.   124 ( 181 )   CS2024-38, 1 - 1   2024.08

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

Other Link： https://ken.ieice.org/ken/paper/20240905ic4D/

Study on IEEE 802.15.3e Application in Multiple-Spot Millimeter-Wave High-Capacity Transport Transmission System Using Gazebo Simulator

IEICE Tech. Rep.   124 ( 107 )   RCS2024-84, 1 - 6   2024.07

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Authorship：Last author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

Other Link： https://ken.ieice.org/ken/paper/20240717Yc3I/

Study on improvement of polar code-based information reconciliation for continuous-variable quantum key distribution by revealing received soft values

IEICE Tech. Rep.   124 ( 100 )   CS2024-18, 49 - 54   2024.07

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

Other Link： https://ken.ieice.org/ken/paper/20240711Kc3r/

Study on high-efficiency information reconciliation for continuous-variable quantum key distribution using raptor code

IEICE Tech. Rep.   124 ( 100 )   CS2024-18, 43 - 48   2024.07

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

Other Link： https://ken.ieice.org/ken/paper/20240711bc3r/

Capacity enhancement using LEO-QZS MIMO transmission in non-terrestrial network systems Reviewed

T. Shimizu, E. Okamoto, A. Miura, H. Tsuji

IEICE Communications Express   13 ( 7 )   260 - 263   2024.07

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.23919/comex.2024XBL0063

Other Link： https://doi.org/10.23919/comex.2024XBL0063

Error-control information reconciliation scheme for continuous-variable quantum key distribution using fixed-bit polar codes Reviewed

K. Yamaura, H. Endo, E. Okamoto, M. Sasaki, M. Fujiwara, M. Toyoshima

IEICE Communications Express   13 ( 7 )   268 - 271   2024.07

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.23919/comex.2024XBL0050

Other Link： https://doi.org/10.23919/comex.2024XBL0050

Study on Machine Learning-based Hazardous Material Detection in 300GHz Sub-THz Imaging Using Optical Image Training Data

IEICE Tech. Rep.   124 ( 84 )   RCS2024-28, 1 - 6   2024.06

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

Other Link： https://ken.ieice.org/ken/paper/202406194cDu/

Study on Physical-Layer Encrypted Relay Transmission Method Using Group Key for Distributed Terminal Cooperative Communication

IEICE Tech. Rep.   124 ( 84 )   RCS2024-62, 203 - 208   2024.06

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

Other Link： https://ken.ieice.org/ken/paper/20240620fcDq/

Study on Image Quality Enhancement Using Two-Step Adaptive Gamma Correction Method in 300 GHz Sub-THz Imaging

IEICE Tech. Rep.   124 ( 84 )   RCS2024-29, 7 - 12   2024.06

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

Other Link： https://ken.ieice.org/ken/paper/20240619JcDu/

A Study on Adaptive Beamwidth Control Method Using Vehicular Sensor and Map Information in 5G Millimeter-Wave Vehicle Communication System

IEICE Tech. Rep.   124 ( 9 )   RCS2024-2, 7 - 12   2024.04

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

Other Link： https://ken.ieice.org/ken/paper/20240425MccX/

Consideration of Space Network Utilization in 6G Invited

IEICE Tech. Rep.   123 ( 434 )   RCS2023-282, 131 - 131   2024.03

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Authorship：Lead author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

Other Link： https://ken.ieice.org/ken/paper/20240315Wccj/

A Study on Decoding Performance Improvement by Using Non-binary LDPC Codes in Outer Channel Coding-Concatenated Chaos Coded Modulation

IEICE Tech. Rep.   123 ( 340 )   RCS2023-230, 133 - 138   2024.01

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Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

Other Link： https://ken.ieice.org/ken/paper/20240118OcAY/

A Study on Complexity Reduction of Signal Processing for Object Detection Using Sub-Terahertz Waves

IEICE Tech. Rep.   123 ( 308 )   RCS2023-196, 100 - 105   2023.12

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Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)  

Other Link： https://ken.ieice.org/ken/paper/20231215qCZY/

High-quality and low-complexity polar-coded radio-wave encrypted modulation utilizing multipurpose frozen bits Reviewed

K. Asano, T. Abe, K. Kato, E. Okamoto, T. Yamamoto

IEICE Transactions on Communications   E106-B ( 10 )   987 - 996   2023.10

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1587/transcom.2022EBT0007

Performance Comparison of Channel Coding Methods for Optical Satellite Data Relay System Reviewed

E. Okamoto, Y. Yamashita, Y. Satoh, M. Nakadai, T. Itahashi, S. Yamakawa

Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC2023)   1 - 6   2023.09

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Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)  

Other Link： https://ieeexplore.ieee.org/document/10294033

Adaptive Polar Coding Scheme Using Hybrid Pilot and Frozen Bits for Satellite Laser Communications Reviewed

Kensuke Yamaura, Hiroki Ito, Eiji Okamoto, Hiroyuki Endo, Masahide Sasaki, Mikio Fujiwara, Morio Toyoshima

IEICE Communications Express   12 ( 9 )   480 - 485   2023.09

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Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1587/comex.2023XBL0085

Other Link： https://doi.org/10.1587/comex.2023XBL0085