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Papers - OKAMOTO Eiji

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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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Comparative study of channel coding methods for performance improvement in next-generation optical satellite data relay system Invited

IEICE Tech. Rep. 123 ( 171 ) SAT2023-42, 41 - 45 2023.08

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

Other Link： https://ken.ieice.org/ken/paper/20230831zCWS/

Demonstration of chaos-based radio encryption modulation scheme through wired transmission experiments Reviewed

K. Tomita, M. Okumura, E. Okamoto

IEICE Transactions on Communications E106-B ( 8 ) 686 - 695 2023.08

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

DOI： 10.1587/transcom.2022EBT0005

Other Link： https://doi.org/10.1587/transcom.2022EBT0005

Improvement of key generation efficiency of free-space optical physical layer cryptography using polar code

IEICE Tech. Rep. 123 ( 105 ) SAT2023-12, 13 - 17 2023.07

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

Other Link： https://ken.ieice.org/ken/paper/20230712kCvc/

A Study on Complexity Reduction of Bit Assignment and Performance Improvement by Channel Code Concatenation in Chaos Modulation

IEICE Tech. Rep. 123 ( 108 ) RCS2023-86, 33 - 38 2023.07

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

Other Link： https://ken.ieice.org/ken/paper/20230713fCVO/

A study on the application of Raptor codes in a relay transmission model for large-capacity data utilizing V2X

IEICE Tech. Rep. 123 ( 108 ) CS2023-81, 13 - 18 2023.07

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

Other Link： https://ken.ieice.org/ken/paper/20230712ICVg/

A Study of High Efficiency of Information Reconciliation in Continuous Quantum Key Distribution with Fixed Bit Polar Codes

IEICE Tech. Rep. 123 ( 105 ) SAT2023-11, 7 - 12 2023.07

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

Other Link： https://ken.ieice.org/ken/paper/20230712jCvC/

Advantages and Challenges of Applying Nonlinear Optimization Techniques in 6G Systems Invited

IEICE ESS Fundamentals Review 17 ( 1 ) 26 - 35 2023.07

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：IEICE

DOI： 10.1587/essfr.17.1_26

Other Link： https://doi.org/10.1587/essfr.17.1_26

A Study on performance improvement of uplink multi-user radio-encypted MIMO transmission scheme using accurate probability calculation

IEICE Tech. Rep. 123 ( 76 ) RCS2023-32, 25 - 30 2023.06

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

Other Link： https://ken.ieice.org/ken/paper/202306144Cu5/

A Study on Accurate Beam Tracking Method Using Vehicle Location Information in 5G Millimeter Wave Vehicle Communication System

IEICE Tech. Rep. 123 ( 76 ) RCS2023-41, 75 - 80 2023.06

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

Other Link： https://ken.ieice.org/ken/paper/20230614tCu6/

Fast secret key-sharing method based on channel information and chaos randomization Reviewed

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

IEICE Communications Express 12 ( 5 ) 188 - 193 2023.05

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

DOI： 10.1587/comex.2023XBL0007

Other Link： https://www.jstage.jst.go.jp/article/comex/11/5/11_2022XBL0007/_article

Polar-coded transmission over 7.8-km terrestrial free-space optical links Reviewed International journal

S. Fujita, E. Okamoto, H. Takenaka, H. Endo, M. Fujiwara, M. Kitamura, R. Shimizu, M. Sasaki, and M. Toyoshima

Photonics 10 ( 4: 462 ) 1 - 14 2023.04

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

DOI： 10.3390/photonics10040462

Other Link： https://www.mdpi.com/2304-6732/10/4/462

High-quality secure wireless transmission scheme using polar codes and radio-wave encrypted modulation Reviewed

K. Asano, M. Okumura, T. Abe, E. Okamoto, T. Yamamoto

IEICE Transactions on Communications E106-B ( 4 ) 374 - 383 2023.04

Language：English Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

DOI： 10.1587/transcom.2022EBP3098

Other Link： https://search.ieice.org/bin/summary.php?id=e106-b_4_374&category=B&year=2023&lang=E&abst=

Study on 6G system modeling and performance improvement through nonlinear signal processing Invited

IEICE General Conf. 1 - 4 2023.03

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

A Study on Reducing Transmission Waiting Time Using Non-Orthogonal Multiple Access in UAV Uplink Communication System

IEICE Tech. Rep. 122 ( 426 ) ITS2022-80, 6 - 11 2023.03

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

Other Link： https://ken.ieice.org/ken/paper/20230313NCSG/

A Study on Coverage Extension Using Cooperative Relay Transmission in Uplink V2N Communication

IEICE Tech. Rep. 122 ( 426 ) ITS2022-81, 12 - 17 2023.03

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

Other Link： https://ken.ieice.org/ken/paper/20230313LCSH/

Adaptive transmission suspension of V2N uplink communication based on in-advanced quality of service notification Reviewed International journal

R. Hasegawa, E. Okamoto

Vehicles 5 ( 1 ) 203 - 222 2023.02

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

DOI： 10.3390/vehicles5010012

Other Link： https://www.mdpi.com/2624-8921/5/1/12

A Study on Bit Error Rate Improvement of Chaos Modulation By Bit Assignment Using Nonlinear Optimization Algorithm

IEICE Tech. Rep. 122 ( 357 ) RCS2022-209, 7 - 12 2023.01

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

Other Link： https://ken.ieice.org/ken/paper/20230124VCpX/

A Robust Indoor Localization Method for NLOS Environments Utilizing Sensor Subsets Reviewed International journal

K Ishida, E. Okamoto, H.-B. Li

IEEE Open Journal of Signal Processing 3 450 - 463 2022.12

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

DOI： 10.1109/OJSP.2023.3235245

Other Link： https://ieeexplore.ieee.org/document/10011532

A Study on Performance Improvement of Uplink Multi-User Chaos MIMO Transmission Scheme

IEICE Tech. Rep. 122 ( 252 ) RCS2022-157, 13 - 17 2022.11

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

Other Link： https://ken.ieice.org/ken/paper/20221115wCnC/

A Study on Performance Improvement of Chaos Modulation-Concatenated Polar Codes with Multi-purpose Frozen Bits by Turbo Decoding Invited

IEICE Tech. Rep. 122 ( 252 ) RCS2022-158, 19 - 24 2022.11

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

Other Link： https://ken.ieice.org/ken/paper/20221115oCn1/

Novel wireless communication system realized by mobile terminal collaboration - Recent results and application to uplink transmission - Invited

IEICE Tech. Rep. 122 ( 235 ) RCS2022-149, 107 - 107 2022.10

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

Other Link： https://ken.ieice.org/ken/paper/20221028cCNA/

Performance Improvement of Radio-Wave Encrypted MIMO Communications Using Average LLR Clipping Reviewed

M. Okumura, K. Asano, T. Abe, E. Okamoto, T. Yamamoto

IEICE Transactions on Communications E105-B ( 8 ) 931 - 943 2022.08

Language：English Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

DOI： 10.1587/transcom.2021EBT0007

Other Link： https://search.ieice.org/bin/summary.php?id=e105-b_8_931&category=B&year=2022&lang=E&abst=

Study on efficient channel coding method for next-generation optical satellite data relay system

IEICE Tech. Rep. 122 ( 137 ) SAT2022-27, 57 - 62 2022.07

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

Other Link： https://ken.ieice.org/ken/paper/20220729fCLb/

Study on Extended Ranging and Improved Accuracy of Indoor Positioning Using 5G D2D Communications

IEICE Tech. Rep. 122 ( 108 ) SeMI2022-40, 87 - 92 2022.07

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

Other Link： https://www.ieice.org/ken/paper/20220715OCLy/

A Study on Secret Key Sharing and Randomizing Method Based on Channel State Information and Chaos Theory

IEICE Tech. Rep. 122 ( 73 ) RCS2022-66, 247 - 252 2022.06

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

Other Link： https://www.ieice.org/ken/paper/20220617RCKQ/

Study on Highly Accurate Beam Tracking Method Using Onboard Spherical Array Antenna for 5G Millimeter Wave Vehicle Communication Systems

IEICE Tech. Rep. 122 ( 73 ) RCS2022-46, 132 - 137 2022.06

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

Other Link： https://www.ieice.org/ken/paper/20220616fCKU/

Study on performance improvement of early hybrid automatic repeat request method on 5G URLLC using adaptive modulation and coding

IEICE Tech. Rep. 122 ( 73 ) RCS2022-45, 126 - 131 2022.06

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

Other Link： https://www.ieice.org/ken/paper/20220616OCKv/

Performance Evaluation of Radio-Wave Encrypted Modulation Method by Wireless Transmission Experiments

IEICE Tech. Rep. 122 ( 73 ) RCS2022-44, 120 - 125 2022.06

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

Other Link： https://www.ieice.org/ken/paper/20220616FCKW/

Construction of high-efficient information reconciliation method using polar codes and adaptive post selection for continuous-variable quantum key distribution

IEICE Tech. Rep. 122 ( 44 ) SAT2022-11, 42 - 57 2022.05

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

Other Link： https://www.ieice.org/ken/paper/20220526kCKB/

A Study on Performance Improvement in Mid-to-High Latitude Regions Using MIMO Transmission Method with LEO satellites and QZS

IEICE Tech. Rep. 122 ( 44 ) SAT2022-10, 46 - 51 2022.05

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

Other Link： https://www.ieice.org/ken/paper/20220526tC9Y/

Multi-level Encrypted Transmission Scheme Using Hybrid Chaos and Linear Modulation Reviewed

T. Kaga, M. Okumura, E. Okamoto, T. Yamamoto

IEICE Transactions on Communications E105-B ( 5 ) 638 - 647 2022.05

Language：English Publishing type：Research paper (scientific journal) Publisher：IEICE

DOI： 10.1587/transcom.2021EBP3092

Other Link： https://search.ieice.org/bin/summary.php?id=e105-b_5_638&category=B&year=2022&lang=E&abst=

Accurate Beam Tracking Scheme for V2N Transmission Using Vehicle Logs Reviewed

R. Kato, M. Okumura, E. Okamoto

IEICE Communications Express 11 ( 5 ) 189 - 194 2022.05

Language：English Publishing type：Research paper (scientific journal) Publisher：IEICE

DOI： 10.1587/comex.2022XBL0007

Other Link： https://www.jstage.jst.go.jp/article/comex/11/5/11_2022XBL0007/_article

Study on utilization of higher-frequency space communications for 6G Invited

IEICE Tech. Rep. 121 ( 391 ) RCS2021-283, 156 - 158 2022.02

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

Other Link： https://www.ieice.org/ken/paper/20220303vCj8/

A study on Complexity Reduction and Performance Improvement of Polar Coded Chaos Modulation Utilizing Multi-purpose Frozen Bits

IEICE Tech. Rep. 121 ( 329 ) RCS2021-197, 7 - 12 2022.01

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

Other Link： https://www.ieice.org/ken/paper/20220120bCHY/

A Study on Inter-Vehicle Cooperative Transmission Method Using Full-Duplex Communication

SIG Technical Reports 2021-ITS-87 ( 36 ) 1 - 6 2021.11

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

Other Link： https://ipsj.ixsq.nii.ac.jp/ej/?action=pages_view_main&active_action=repository_view_main_item_detail&item_id=214296&item_no=1&page_id=13&block_id=8

A Study of Intelligent Lighting System to Complement the Estimated Location Error Using UWB in Open Plan Office

SIG Technical Reports 2021-ITS-87 ( 32 ) 1 - 6 2021.11

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

Other Link： https://ipsj.ixsq.nii.ac.jp/ej/?action=pages_view_main&active_action=repository_view_main_item_detail&item_id=214292&item_no=1&page_id=13&block_id=8

Study on Performance Improvement of Radio-Wave Encrypted Modulation by LLR Clipping

IEICE Tech. Rep. 121 ( 210 ) RCS2021-137, 100 - 105 2021.10

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

Other Link： https://www.ieice.org/ken/paper/20211022gCfh/

Artificially Time-Varying Differential MIMO for Achieving Practical Physical Layer Security Reviewed International coauthorship International journal

N. Ishikawa, J. M. Hamamreh, E. Okamoto, C. Xu, L. Xiao

IEEE Open Journal of the Communications Society ( 2 ) 2180 - 2194 2021.09

Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE

DOI： 10.1109/OJCOMS.2021.3112486

Other Link： https://ieeexplore.ieee.org/document/9536954

Improvement of channel coding gain of chaos modulation using logistic maps Reviewed

M. Okumura, T. Kaga, E. Okamoto, T. Yamamoto

IEICE Communications Express 10 ( 9 ) 744 - 750 2021.09

Language：English Publishing type：Research paper (scientific journal) Publisher：IEICE

DOI： 10.1587/comex.2021XBL0111

Other Link： https://www.jstage.jst.go.jp/article/comex/10/9/10_2021XBL0111/_article

Study on key-distillation system with adaptive polar codes in free-space quantum key distribution Invited

IEICE Tech. Rep. 121 ( 152 ) SAT2021-35, 37 - 42 2021.08

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

Other Link： https://www.ieice.org/ken/paper/20210827BCF1/

Performance analysis of LEO-GEO multi-satellite MIMO transmission method Invited

IEICE Tech. Rep. 121 ( 152 ) SAT2021-36, 43 - 48 2021.08

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

Other Link： https://www.ieice.org/ken/paper/20210827fCF1/

Wired Transmission Experiments of Chaos Coded Modulation Method Using Software-Defined Radio

IEICE Tech. Rep. 121 ( 103 ) RCS2021-88, 55-33, 25 - 60 2021.07

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

Other Link： https://www.ieice.org/ken/paper/20210715hCeP/

Overview of nonlinear signal processing in 5G and 6G access technologies Invited Reviewed

E.Okamoto

Nonlinear Theory and Its Applications, IEICE E12-N ( 3 ) 257 - 274 2021.07

Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1587/nolta.12.257

Other Link： https://www.jstage.jst.go.jp/article/nolta/12/3/12_257/_article

A Study on Secret Key Sharing Using Time-Division Duplex Channel Information in Radio-Wave Encrypted Modulation

IEICE Tech. Rep. 121 ( 72 ) RCS2021-35, 37 - 42 2021.06

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

Other Link： https://www.ieice.org/ken/paper/20210623qCER/

A Study on Performance Improvement of Polar Coded-Radio Wave Encrypted Modulation by CRC Code Concatenation

IEICE Tech. Rep. 121 ( 72 ) RCS2021-34, 31 - 36 2021.06

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

Other Link： https://www.ieice.org/ken/paper/20210623KCER/

A Study on Throughput Improvement of Adaptive Modulation and Coding based HARQ in 5G URLLC

IEICE Tech. Rep. 121 ( 72 ) RCS2021-33, 25 - 30 2021.06

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

Other Link： https://www.ieice.org/ken/paper/202106235CER/

A Study on Multi-rate Polar Coding Scheme Using Hybrid Pilot and Frozen Bits in Satellite Laser Communications

IEICE Tech. Rep. 121 ( 26 ) SAT2021-16, 83 - 88 2021.05

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

Other Link： https://www.ieice.org/ken/paper/20210521bC3p/

Evaluation of the forward error correction format for LEO-Ground optical communication by use of Reed-Solomon product code Reviewed International journal

H. Yamazoe, S. Ohta, H. Komatsu, K. Suzuki, E. Okamoto, K. Iwamoto

Proc. SPIE International Conference on Free-Space Laser Communications XXXIII 11678 1 - 10 2021.04

Language：English Publishing type：Research paper (international conference proceedings)

A Study of Highly Accurate V2I Beam Tracking Scheme Using Vehicle Logs

IEICE Tech. Rep. 121 ( 7 ) RCS2021-11, 48 - 53 2021.04

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

Other Link： https://www.ieice.org/ken/paper/20210423pC3d/

Performance analysis of polar-code transmission experiments over 7.8-km terrestrial free-space optical link using channel equalization Reviewed International journal

S. Fujita, E. Okamoto, H. Takenaka, H. Kunimori, H. Endo, M. Fujiwara, M. Kitamura, R. Shimizu, M. Sasaki, M. Toyoshima

Proc. Int’l Conf. on Space Optics (ICSO2020) 1 - 9 2021.03

Language：English Publishing type：Research paper (international conference proceedings)

Study on application of polar codes to information reconciliation in free-space quantum key distribution Reviewed International journal

Y. Yamashita, H. Endo, S. Fujita, E. Okamoto, H. Takenaka, M. Toyoshima

Proc. Int’l Conf. on Space Optics (ICSO2020) 1 - 9 2021.03

Language：English Publishing type：Research paper (international conference proceedings)

Study on LEO-GEO multi-satellite MIMO transmission method considering propagation delay difference

IEICE Tech. Rep. 120 ( 372 ) SAT2020-34, 29 - 34 2021.02

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

Other Link： https://www.ieice.org/ken/paper/202102195Ccf/

Study on performance analysis of early HARQ retransmission control in high-mobility environments

IEICE Tech. Rep. 120 ( 322 ) RCS2020-162, 46-163, 52 - 51 2021.01

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

Other Link： https://www.ieice.org/ken/paper/20210121QC1P/

Improvement of Encoding Gain in Radio-Wave Encrypted Modulation Using Logistic Map

IEICE Tech. Rep. 120 ( 322 ) RCS2020-163, 52 - 57 2021.01

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

Other Link： https://www.ieice.org/ken/paper/20210121uCbv/

Study on UWB indoor localization method using machine learning-based accurate NLOS detection

IEICE Tech. Rep. 120 ( 315 ) SeMI2020-50, 39 - 44 2021.01

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

Other Link： https://www.ieice.org/ken/paper/202101213Cbx/

Chaos-Based Interleave Division Multiple Access Scheme with Physical Layer Security Reviewed International journal

M. Okumura, E. Okamoto, T. Kaga, T. Yamamoto

Proc. IEEE Consumer Communications and Networking Conference (CCNC2021) 1 - 2 2021.01

Language：English Publishing type：Research paper (international conference proceedings)

Performance Analysis of Early HARQ Retransmission Scheme in Highway Environments Reviewed International journal

Y. Shiomitsu, E. Okamoto, M. Mikami, H. Yoshino

Proc. IEEE Vehicular Networking Conference (VNC2020) 1 - 2 2020.12

Language：English Publishing type：Research paper (international conference proceedings)

Adaptive MIMO mode switching scheme for flexible 5G URLLC transmission Reviewed

Y. Shiomitsu, E. Okamoto, M. Mikami, H. Yoshino

Proc. IEICE 2020 International Conference on Emerging Technologies for Communications (ICETC2020) 1 - 4 2020.12

Language：English Publishing type：Research paper (international conference proceedings)

Application of Radio-Wave Encryption to Interleave-Division Multiple-Access Scheme Reviewed

M. Okumura, E. Okamoto, Y. Masuda, T. Kaga, T. Yamamoto

Proc. International Symposium on Nonlinear Theory and its Applications (NOLTA 2020) 530 - 533 2020.11

Language：English Publishing type：Research paper (international conference proceedings)

Early HARQ Retransmission Control based on Channel State Information in 5G URLLC Reviewed

Y. Shiomitsu, E. Okamoto, M. Mikami, H. Yoshino

Proc. International Symposium on Nonlinear Theory and its Applications (NOLTA 2020) 534 - 537 2020.11

Language：English Publishing type：Research paper (international conference proceedings)

5Gを用いた自動運転無線システムの高信頼・低遅延化技術 Invited

岡本英二

車載テクノロジー2020年10月号 8 ( 1 ) 66 - 70 2020.10

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：技術情報協会

Transmission experiment of polar codes using channel estimation and equalization to improve performance in terrestrial free-space optical channels

1C12, 1 - 6 2020.10

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

One investigation concerning the application of polar codes to free-space quantum key distribution

4G14, 1 - 6 2020.10

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

Overview of the 6G Workshop Organized by IEICE Technical Committee on RCS - We co-create 6G! – Invited Reviewed International journal

T. Nishimura, K. Adachi, O. Nakamura, M. Sakai, M. Iwabuchi, T. Okuyama, O. Muta, K. Muraoka, F. Maehara, T. Tandai, S. Suyama, E. Okamoto

Proc. International Symposium on Wireless Personal Multimedia Communications (WPMC2020) 1 - 2 2020.10

Language：English Publishing type：Research paper (international conference proceedings)

Study on secure user detection and channel estimation scheme in grant-free massive machine type communications Invited Reviewed International journal

E. Okamoto, Y. Masuda, T. Yamamoto

Proc. International Symposium on Wireless Personal Multimedia Communications (WPMC2020) 1 - 2 2020.10

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

Shared dataset framework toward applications of machine learning and mathematical optimization for 6G

IEICE Tech. Rep. 120 ( 204 ) RCS2020-92, 1 - 6 2020.10

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

Other Link： https://www.ieice.org/ken/paper/202010220CaC/

A study on encrypted hybrid modulation scheme using chaos modulation and QAM

IEICE Tech. Rep. 120 ( 130 ) RCS2020-83, 23 - 28 2020.08

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

Other Link： https://www.ieice.org/ken/paper/20200821C1ZS/

Performance improvements of polar-code transmission using channel estimation and equalization in terrestrial free-space optical experiments

IEICE Tech. Rep. 120 ( 129 ) SAT2020-13, 19 - 24 2020.08

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

Other Link： https://www.ieice.org/ken/paper/20200820z1Zs/

Study on multi-satellite MIMO transmission method using LEO and GEO

IEICE Tech. Rep. 120 ( 99 ) SAT2020-4, 7 - 12 2020.07

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

Other Link： https://www.ieice.org/ken/paper/2020071571yv/

Numerical investigation on the application of polar codes to free-space quantum key distribution

IEICE Tech. Rep. 120 ( 99 ) SAT2020-5, 13 - 18 2020.07

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

Other Link： https://www.ieice.org/ken/paper/20200715A1yW/

Study on Applying Radio -Wave Encryption to Interleave Division Multiple Access Scheme

IEICE Tech. Rep. 120 ( 89 ) RCS2020-70, 73 - 78 2020.07

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

Other Link： https://www.ieice.org/ken/paper/20200709Q1ZC/

Study on Applying Radio -Wave Encryption to Interleave Division Multiple Access Scheme

IEICE Tech. Rep. 120 ( 74 ) RCS2020-30, 43 - 48 2020.06

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

Study on Adaptive Switching of Variable Linear Array Antenna Elements for Reliable Millimeter-Wave V2N Transmission

IEICE Tech. Rep. 120 ( 74 ) RCS2020-32, 55 - 60 2020.06

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

Improvement of Vehicle-to-Network Communications Utilizing In-Advance Quality of Service Notification Reviewed International journal

R. Hasegawa, E. Okamoto, H. Akita

Proc. RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2020) 45 - 48 2020.02

Language：English Publishing type：Research paper (international conference proceedings)

A Study on Load Balancing in V2N Uplink using In-Advanced QoS Notification

IEICE Tech. Rep. 119 ( 448 ) RCS2019-379, 303 - 308 2020.02

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

Study on application of Reed-Solomon product code for optical on-off keying satellite communication -A space link in 6G networks-

IEICE Tech. Rep. 119 ( 448 ) RCS2019-370, 257 - 262 2020.02

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

Study on quick HARQ retransmission control based on channel state information in 5G URLLC

IEICE Tech. Rep. 119 ( 378 ) RCS2019-306, 233 - 238 2020.01

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

Study on application of low complexity chaos NOMA-SIC decoding method in uplink

IEICE Tech. Rep. 119 ( 378 ) RCS2019-293, 155 - 160 2020.01

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

An NLOS sensor elimination method based on estimated position analysis using machine learning in indoor localization

IEICE Tech. Rep. 119 ( 378 ) RCS2019-286, 123 - 128 2020.01

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

Study on improved relay vehicle selection in V2V cooperative communication system for far-vehicle V2I uplink transmission

IEICE Tech. Rep. 119 ( 378 ) RCS2019-283, 105 - 110 2020.01

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

Low Complexity Decoding of Downlink Chaos NOMA Scheme with Physical Layer Security Reviewed International journal

Y. Masuda, E. Okamoto, T. Yamamoto

Proc. IEEE Consumer Communications and Networking Conference (CCNC2020) 1 - 6 2020.01

Language：English Publishing type：Research paper (international conference proceedings)

Performance improvement of V2I uplink transmission on far vehicles using frequency scheduling-based cooperative V2V relay transmission Reviewed International journal

H. Ishikawa, E. Okamoto, H. Okada, S. Makido

Proc. IEEE Consumer Communications and Networking Conference (CCNC2020) 1 - 6 2020.01

Language：English Publishing type：Research paper (international conference proceedings)

An NLOS elimination scheme using iterative position estimation for accurate indoor localization Reviewed

K. Ishida, E. Okamoto, H.-B. Li

Proc. World Symposium on Communication Engineering (WSCE 2019) 1 - 1 2019.12

Language：English Publishing type：Research paper (international conference proceedings)

Effective Frame Configuration of 5G URLLC Using Open-Loop HARQ for Autonomous Driving Reviewed International journal

Y. Shiomitsu, E. Okamoto, M. Mikami, H. Yoshino

Proc. IEEE Vehicular Networking Conference (VNC2019) 1 - 2 2019.12

Language：English Publishing type：Research paper (international conference proceedings)

Study on performance improvement of 5G ultra-reliable and low latency communications Invited International journal

E. Okamoto

Proc. International Workshop on Smart Wireless Communications (SmartCom2019) 1 - 1 2019.11

Language：English Publishing type：Research paper (international conference proceedings)

Experimental evaluation of polar code transmission in terrestrial free space optics Reviewed International journal

S. Fujita, K. Ito, E. Okamoto, H. Takenaka, H. Kunimori, H. Endo, M. Fujiwara, M. Kitamura, R. Shimizu, M. Sasaki, M. Toyoshima

Proc. IEEE International Conference on Space Optical Systems and Applications (ICSOS2019) 1 - 6 2019.10

Language：English Publishing type：Research paper (international conference proceedings)

Performance improvement of UAV-assisted data gathering system for distributed IoT terminals

K. Ueno, E. Okamoto, H. Tsuji, A. Miura

IEICE Tech. Rep. 119 ( 220 ) SAT2019-63, 115 - 120 2019.10

Language：English Publishing type：Research paper (conference, symposium, etc.) Publisher：IEICE-KOSST

A study of satellite 5G Invited

IEICE Tech. Rep. 119 ( 176 ) RCS2019-173, 131 - 131 2019.08

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

A Study on Multi-rate Polar Coding Scheme in Free Space Optics Invited

IEICE Tech. Rep. 119 ( 175 ) SAT2019-36, 105 - 110 2019.08

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

A study of wireless technologies for 5G mobile communications system Invited

IEICE Tech. Rep. 119 ( 166 ) SRW2019-20, 41 - 41 2019.08

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

Performance comparison of multi-user shared multiple access scheme in uplink channels Reviewed

E. Okamoto, M. Mikami, H. Yoshino

IEICE Transactions on Communications E102-B ( 8 ) 1458 - 1466 2019.08

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

Other Link： https://search.ieice.org/bin/summary.php?id=e102-b_8_1458&category=B&year=2019&lang=E&abst=

A Study on Wireless Frame Configuration to Achieve Automatic Operation Using 5G URLLC

IEICE Tech. Rep. 119 ( 90 ) RCS2019-45, 49 - 54 2019.06

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

A study on performance improvment of uplink massive chaos MIMO transmission scheme

IEICE Tech. Rep. 119 ( 90 ) RCS2019-48, 67 - 72 2019.06

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

A study on accurate indoor localization in many NLOS sensor environments

IEICE Tech. Rep. 119 ( 90 ) RCS2019-47, 61 - 66 2019.06

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

An energy-efficient and wide-area uplink IoT data transmission scheme using UAV

IEICE Tech. Rep. 119 ( 90 ) RCS2019-46, 55 - 60 2019.06

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

Experiment and performance analysis of polar code transmission in terrestrial free space optics

IEICE Tech. Rep. 119 ( 27 ) SAT2019-1, 1 - 6 2019.05

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

A Study on Efficient Decoder Design Using EXIT Chart for Polar Code Concatenated Chaos-MIMO Transmission Scheme Reviewed International journal

K. Ito, E. Okamoto, Y. Masuda, T. Yamamoto

Proc. RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2019) 176 - 179 2019.03

Language：English Publishing type：Research paper (international conference proceedings)

Study on accurate beam tracking scheme using array antennas for millimeter-wave V2N transmission

IEICE Tech. Rep. 118 ( 474 ) RCS2018-302, 113 - 118 2019.03

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

A study on throughput performance improvement of ITS cooperative relay transmission scheme using non-orthogonal signal superposition

IEICE Tech. Rep. 118 ( 449 ) ITS2018-80, 181 - 186 2019.02

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

A study on polar code concatenation to chaos MIMO transmission scheme Invited

IEICE Tech. Rep. 118 ( 435 ) RCS2018-275, 191 - 196 2019.01

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

A Chaos MIMO-based Polar Concatenation Code for Secure Channel Coding Reviewed International journal

K. Ito, Y. Masuda, E. Okamoto

Proc. Int'l Conf. on Information Networking (ICOIN2019) 267 - 272 2019.01

Language：English Publishing type：Research paper (international conference proceedings)

Performance Analysis of Uplink V2I Cooperative Transmission Scheme in Practical Road Environments Reviewed International journal

H. Ishikawa, E. Okamoto, S. Okamoto, H. Okada, S. Makido

Proc. Int'l Conf. on Information Networking (ICOIN2019) 103 - 107 2019.01

Language：English Publishing type：Research paper (international conference proceedings)

Performance Analysis of a Terrestrial/UAV Integrated Mobile Communications System Using Code Division Multiplexing in Natural Disasters Reviewed International journal

R. Hasegawa, E. Okamoto, H. Tsuji, A. Miura

Proc. Int'l Conf. on Information Networking (ICOIN2019) 108 - 112 2019.01

Language：English Publishing type：Research paper (international conference proceedings)

An Uplink Non-Orthogonal Multiple Access Scheme Having Physical Layer Security Based on Chaos Modulation Reviewed International journal

Y. Masuda, E. Okamoto, T. Yamamoto, K. Ito

Proc. Int'l Conf. on Information Networking (ICOIN2019) 141 - 145 2019.01

Language：English Publishing type：Research paper (international conference proceedings)

Performance analysis of large-scale non-orthogonal sparse chaos code multiple access scheme using GaBP algorithm Invited

IEICE Tech. Rep. 118 ( 311 ) RCS2018-186, 49 - 54 2018.11

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

A study on indoor dimming method utilizing outside light for power saving Reviewed International journal

K. Sasaki, E. Okamoto

Proc. Asia-Pacific Signal and Information Proc. of Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA ASC2018) 1847 - 1852 2018.11

Language：English Publishing type：Research paper (international conference proceedings)

An Adaptive Coded Transmission Scheme utilizing Frozen bits of Polar Code in Satellite Laser Communications Reviewed International journal

K. Ito, E. Okamoto, H. Takenaka, H. Kunimori, M. Toyoshima

Proc. Int’l Conf. on Space Optics (ICSO2018) 1 - 7 2018.10

Language：English Publishing type：Research paper (international conference proceedings)

Large-Scale Grant-Free Sparse Chaos Code Multiple Access Scheme for 5G IoT Reviewed International journal

E. Okamoto, N. Horiike, T. Yamamoto

Proc. IEEE Vehicular Technology Conference 2018 Fall (VTC2018-Fall) 1 - 5 2018.08

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

A downlink non-orthogonal multiple access scheme having physical layer security Reviewed International journal

N. Horiike, E. Okamoto, T. Yamamoto

EURASIP Journal on Wireless Communications and Networking 2018 ( 1 ) 1 - 11 2018.08

Language：English Publishing type：Research paper (scientific journal) Publisher：Springer

DOI： 10.1186/s13638-018-1156-8

A Study on Polar Adaptive Coding Scheme in Free Space Optics

IEICE Tech. Rep. 118 ( 176 ) SAT2018-47, 103 - 108 2018.08

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

Performance analysis of non-orthogonal sparse chaos code multiple access scheme based on mutual information

IEICE Tech. Rep. 118 ( 177 ) RCS2018-144, 69 - 74 2018.08

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

Uplink Large-Scale Chaos MIMO Transmission Scheme Using Gaussian Belief Propagation Invited Reviewed International journal

N. Horiike, E. Okamoto, T. Yamamoto

Journal of Signal Processing 22 ( 4 ) 169 - 173 2018.07

Language：English Publishing type：Research paper (scientific journal)

DOI： 10.2299/jsp.22.169

Study on Non-Orthogonal Multiple Access Scheme having Physical Layer Security

IEICE Tech. Rep. 118 ( 101 ) RCS2018-40, 31 - 36 2018.06

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

Performance Improvement of Terrestrial/UAV Integrated Mobile Communications System using Code Division Multiplexing

IEICE Tech. Rep. 118 ( 101 ) RCS2018-39, 25 - 30 2018.06

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

Simulation analysis of combination probability for uplink V2V cooperative transmission by using SUMO simulator

IEICE Tech. Rep. 118 ( 101 ) RCS2018-38, 19 - 24 2018.06

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

An outline of non-orthogonal multiple access schemes suitable for massive machine type communications in fifth generation mobile communications system (5G) Invited

45 - 52 2018.03

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

A Study on Uplink large-scale Chaos MIMO Transmission Scheme using Gaussian Belief Propagation Reviewed International journal

N. Horiike, E. Okamoto, T. Yamamoto

Proc. RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2018) 37 - 40 2018.03

Language：English Publishing type：Research paper (international conference proceedings)

A Study on Complexity Reduction for Frozen Bit Selection on Polar Code Using Monte-Carlo Method Reviewed International journal

K. Ito, E. Okamoto, H. Takenaka, H. Kunimori, M. Toyoshima

Proc. RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2018) 639 - 642 2018.03

Language：English Publishing type：Research paper (international conference proceedings)

Performance Evaluation of Downlink Multi-User-Chaos-MIMO Transmission System in Correlated Channels Reviewed International journal

R. Kitagawa, N. Horiike, E. Okamoto

Proc. RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2018) 132 - 135 2018.03

Language：English Publishing type：Research paper (international conference proceedings)

A study on improved scheduling algorithm for non-orthogonal multiple access-code division multiplexing scheme Reviewed International journal

H. Kitagawa, E. Okamoto

Proc. RISP International Workshop on Nonlinear Circuits, Communications and Signal Processing (NCSP2018) 124 - 127 2018.03

Language：English Publishing type：Research paper (international conference proceedings)

自動運転の実現へ向けた車車間・路車間通信技術 Invited

岡本英二

車載テクノロジー 5 ( 3 ) 10 - 14 2018.02

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：技術情報協会

Study on Effective Utilization of Micro Cells in Heterogenous Network - Mobility Control in Specific Areas -

IEICE Tech. Rep. 117 ( 456 ) RCS2017-323, 37 - 40 2018.02

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

Study on performance improvement of radio wave encrypted-massive sparse chaos code multiple access scheme using Gaussian belief propagation by turbo-code concatenation

IEICE Tech. Rep. 117 ( 456 ) RCS2017-366, 265 - 270 2018.02

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

Performance comparison of multi-user shared multiple access (MUSA) transmission scheme in uplink fading channels

IEICE Tech. Rep. 117 ( 456 ) RCS2017-365, 259 - 264 2018.02

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

Study on Effective Utilization of Micro Cells in Heterogeneous Network -Performance Improvement of Frequency-efficiency by Mobility Control-

IEICE Tech. Rep. 117 ( 456 ) RCS2017-324, 41 - 44 2018.02

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

Performance analysis of satellite/terrestrial integrated mobile communication system using UAV cooperative communication against survival rate change of terrestrial base station

IEICE Tech. Rep. 117 ( 446 ) SAT2017-57, 7 - 12 2018.02

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

A study on energy-saving indoor lighting control scheme utilizing outside light estimation in sensor networks environment

IEICE Tech. Rep. 117 ( 426 ) ASN2017-101, 103 - 108 2018.01

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

A study on uplink massive chaos MIMO Transmission scheme by applying GaBP

IEICE Tech. Rep. 117 ( 396 ) RCS2017-291, 131 - 136 2018.01

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

A Study on Adaptive Coded Transmission Scheme using Polar Code

IEICE Tech. Rep. 117 ( 396 ) RCS2017-282, 79 - 83 2018.01

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

[Encouragement Talk] A realization of large-scale uplink sparse chaos code multiple access scheme with physical layer security Invited

IEICE Tech. Rep. 117 ( 396 ) RCS2017-271, 13 - 18 2018.01

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

Chaos MIMO-based Downlink Non-orthogonal Multiple Access Scheme With Physical Layer Security Reviewed International journal

N. Horiike, H. Kitagawa, E. Okamoto, T. Yamamoto

Proc IEEE Consumer Communications and Networking Conference (CCNC2018) 1 - 7 2018.01

Language：English Publishing type：Research paper (international conference proceedings)

Sparse chaos code multiple access scheme achieving larger capacity and physical layer security Reviewed International journal

E. Okamoto, N. Horiike, T. Yamamoto

Proc. International Symposium on Wireless Personal Multimedia Communications (WPMC 2017) 603 - 609 2017.12

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

Performance Improvement of Multi-user Chaos MIMO Transmission Scheme using Dirty Paper Coding Reviewed International journal

N. Horiike, E. Okamoto, T. Yamamoto

Proc. Asia-Pacific Conference on Communications (APCC2017) 1 - 5 2017.12

Language：English Publishing type：Research paper (international conference proceedings)

A Consideration on Prospective Utilization of Mobile Communications System Invited Reviewed

The Journal of Institute of Electronics, Information and Communication Engineers (IEICE) 100 ( 12 ) 1371 - 1374 2017.12

Language：Japanese Publishing type：Research paper (scientific journal)

Other Link： http://www.journal.ieice.org/summary.php?id=k100_12_1371&year=2017&lang=J

Performance improvement of non-orthogonal multiple access scheme using code division multiplexing Reviewed International journal

H. Kitagawa, E. Okamoto

International Journal of Distributed Sensor Networks 13 ( 11 ) 1 - 10 2017.11

Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1177/1550147717744528

Application of Polar Codes for Free Space Optical Communication Reviewed International journal

K. Ito, E. Okamoto, H. Takenaka, H. Kunimori, M. Toyoshima

Proc. IEEE International Conference on Space Optical Systems and Applications (ICSOS2017) 193 - 197 2017.11

Language：English Publishing type：Research paper (international conference proceedings)

Role and expectations of satellite communication in 5G Invited International journal

E. Okamoto

Proc. AIAA the 15th BroadSky Workshop 23 - 33 2017.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：AIAA

Performance improvement of low-latency V2I uplink using superposed cooperative V2V transmission Reviewed International journal

E. Okamoto, H. Okada, Y. Ishii, S. Makido

Proc. IEEE Vehicular Technology Conf. 2017 Fall (VTC-2017Fall) 1 - 5 2017.09

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

Non-orthogonal Multiple Access Scheme Suitable for Machine Type Communication (MTC) and Its Applications Invited Reviewed

J100-B ( 8 ) 505 - 519 2017.08

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

Other Link： http://search.ieice.org/bin/summary.php?id=j100-b_8_505&category=B&year=2017&lang=J&abst=

Study on frozen bit determination scheme for Polar codes in free space optical communications

IEICE Tech. Rep. 117 ( 152 ) SAT2017-13, 35 - 40 2017.07

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

A study on synchronization range of satellite/terrestrial integrated mobile communication system with dual satellites

IEICE Tech. Rep. 117 ( 152 ) SAT2017-19, 69 - 74 2017.07

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

A study on energy-saving indoor lighting control scheme utilizing outside light in sensor networks

IEICE Tech. Rep. 117 ( 134 ) ASN2017-61, 247 - 252 2017.07

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

An Initial Study on Decrease of Transmission Delay by Using MEC in Transmission of Dynamic Map Data

IEICE Tech. Rep. 117 ( 103 ) RCS2017-68, 109 - 113 2017.06

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

A study on downlink non-orthogonal multiple access scheme using chaos modulation for physical layer security

IEICE Tech. Rep. 117 ( 103 ) RCS2017-92, 251 - 256 2017.06

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

Study on turbo-coded grant-free massive machine type communications scheme with physical layer security for performance improvement

IEICE Tech. Rep. 117 ( 11 ) RCS2017-7, 35 - 40 2017.04

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

Study on performance improvement of uplink transmission for local dynamic map data using V2V cooperative communication

IEICE Tech. Rep. 116 ( 479, RCS2016-329 ) 223 - 228 2017.02

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

Performance Improvement of Chaos MIMO Transmission scheme by LDPC code Concatenation Using Symbol MAP Detection and STBC Reviewed International journal

N. Horiike, E. Okamoto, T. Yamamoto

Proc. International Conference on Information Networking (ICOIN2017) 200 - 205 2017.01

Language：English Publishing type：Research paper (international conference proceedings)

Performance Improvement of Satellite/Terrestrial Integrated Mobile Communication System using Unmanned Aerial Vehicle Cooperative Communications Reviewed International journal

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

Proc. International Conference on Information Networking (ICOIN2017) 417 - 422 2017.01

Language：English Publishing type：Research paper (international conference proceedings)

Performance Improvement of Non-orthogonal Multiple Access scheme using Code Division Multiplexing Reviewed International journal

H. Kitagawa, E. Okamoto

Proc. International Conference on Information Networking (ICOIN2017) 327 - 331 2017.01

Language：English Publishing type：Research paper (international conference proceedings)

A study on EXIT chart-based characteristic analysis in chaos MIMO transmission scheme using STBC and LDPC code

IEICE Tech. Rep. 116 ( 383, RCS2016-227 ) 105 - 110 2016.12

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

Study on performance improvement of a grant-free massive machine type communications scheme with physical layer security Invited

IEICE Tech. Rep. 116 ( 383, RCS2016-217 ) 47 - 52 2016.12

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

外部符号とSTBCの併用によるカオスMIMO伝送方式の特性改善の検討

堀池直登,岡本英二,山本哲矢

第３９回情報理論とその応用シンポジウム（SITA2016）予稿集 ( 4.2.4 ) 220 - 225 2016.12

Language：Japanese Publishing type：Research paper (conference, symposium, etc.) Publisher：電子情報通信学会

Application of Spinal Code for Performance Improvement in Free-Space Optical Communications Reviewed International journal

N. Saiki, E. Okamoto, H. Takenaka, M. Toyoshima

Proc. International Conference on Space Optics (ICSO2016) 1 - 7 2016.10

Language：English Publishing type：Research paper (international conference proceedings)

A grant-free non-orthogonal multiple access scheme with physical layer security for massive machine type communications

IEICE Tech. Rep. 116 ( 257, RCS2016-178 ) 137 - 142 2016.10

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

Application of non-orthogonal multiple access scheme for satellite downlink in satellite/terrestrial integrated mobile communication system with dual satellites Reviewed

E. Okamoto, H. Tsuji

IEICE Transactions on Communications E99-B ( 10 ) 2146 - 2155 2016.10

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

Other Link： http://search.ieice.org/bin/summary.php?id=e99-b_10_2146&category=B&year=2016&lang=E&abst=

Performance improvement of chaos MIMO scheme using advanced stochastic characteristics Reviewed

E. Okamoto, N. Horiike

IEICE Communications Express 5 ( 10 ) 371 - 377 2016.10

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

Other Link： https://www.jstage.jst.go.jp/article/comex/5/10/5_2016XBL0125/_article

Application of MAP decoding for chaos MIMO scheme to improve error rate performance Reviewed

E. Okamoto, N. Horiike

IEICE Communications Express 5 ( 10 ) 365 - 370 2016.10

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

Other Link： https://www.jstage.jst.go.jp/article/comex/5/10/5_2016XBL0106/_article

小型光トランスポンダ（SOTA）を用いた衛星－地上間光通信実験結果

竹中秀樹,小山善貞,コレフディミタル,秋岡眞樹,國森裕生,宗正康,カラスコカサドアルベルト,豊嶋守生,岡本英二

第60回宇宙科学技術連合講演会講演集 ( 3J02 ) 1 - 5 2016.09

Language：Japanese Publishing type：Research paper (other academic)

A study on application of Reed-Solomon-Spinal concatenation code for free-space optics Invited

116 ( 183 ) SAT2016-40, 43 - 48 2016.08

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

Radio Access Technologies for Fifth Generation Mobile Communications System: Review of Recent Research and Developments in Japan Invited Reviewed

H. Murata, E. Okamoto, M. Mikami, A. Okazaki, S. Suyama, T. Inoue, J. Mashino, T. Yamamoto, M. Taromaru

IEICE Transactions on Communications E99-B ( 8 ) 1638 - 1647 2016.08

Language：English Publishing type：Research paper (scientific journal) Publisher：Institute of Electronics, Information and Communication Engineers

Study on Performance Improvement of Satellite/Terrestrial Integrated mobile Communication System using Unmanned Aerial Vehicle Cooperative communications

116 ( 144 ) SAT2016-32, 113 - 118 2016.07

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

A study on Performance Improvement of Non-Orthogonal Multiple Access scheme with Code Division Multiplexing

IEICE Tech. Rep. 116 ( 110 ) RCS2016-66, 117 - 122 2016.06

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

A study on performance improvement in multilevel modulated chaos MIMO transmission system with outer channel code

IEICE Tech. Rep. 116 ( 110 ) RCS2016-61, 87 - 92 2016.06

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

R&D Activities for 5G Wireless Systems in Japan -- Reviewing IEICE Technical Report for Technical Group on Radio Communication Systems -- Invited International journal

M. Taromaru, H. Murata, E. Okamoto

Proc. 2016 International Workshop on Smart Wireless Communications 1 - 8 2016.05

Language：English Publishing type：Research paper (international conference proceedings)

A Cooperative V2I Uplink Transmission Scheme Utilizing V2V Network Coding Reviewed International journal

E. Okamoto, K. Kunitomo, H. Akita, T. Kyo

Proc. IEEE Vehicular Technology Conf. 2016 Spring (VTC-2016Spring) 1 - 5 2016.05

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

A study on sparse chaos code multiple access scheme for physical layer security Invited

IEICE Tech. Rep. 116 ( 11, RCS2016-8 ) 41 - 46 2016.04

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

Performance improvement of wireless communications system using nonlinear signal processing Invited

IEICE ESS Fundamentals Review 9 ( 4 ) 350 - 363 2016.04

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：IEICE

DOI： 10.1587/essfr.9.4_350

In-orbit verification of small optical transponder (SOTA): evaluation of satellite-to-ground laser communication links Reviewed International journal

H. Takenaka, Y. Koyama, M. Akioka, D. Kolev, N. Iwakiri, H. Kunimori, A. Carrasco-Casado, Y. Munemasa, E. Okamoto, M. Toyoshima

Proc. SPIE 9739, Free-Space Laser Communication and Atmospheric Propagation XXVIII 1 - 12 2016.03

Language：English Publishing type：Research paper (international conference proceedings)

DOI： 10.1117/12.2214461

A study on application of symbol MAP decoding for chaos MIMO scheme to improve error rate performance

IEICE Tech. Rep. 115 ( 475, CCS2015-74 ) 39 - 44 2016.02

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

Performance comparison of SCMA, LDS, and OFDMA transmissions in uplink channels

IEICE Tech. Rep. 115 ( 472, RCS2015-366 ) 199 - 204 2016.02

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

Study on performance improvement of downlink satellite cell in satellite/terrestrial integrated mobile communication system using non-orthogonal multiple access scheme

IEICE Tech. Rep. 115 ( , SAT2015-63 ) 1 - 6 2016.02

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

An EXIT Chart Analysis of Turbo-Coded Chaos MIMO Transmission Scheme Reviewed

E.Okamoto

Proc. IEICE International Symposium on Nonlinear Theory and its Applications (NOLTA 2015) 341 - 344 2015.12

Language：English Publishing type：Research paper (international conference proceedings)

干渉分離重畳による無線多元接続技術の性能向上 Invited

岡本英二

TELECOM FRONTIER ( 89 ) 1 - 9 2015.11

Language：Japanese Publishing type：Research paper (scientific journal)

Other Link： http://www.scat.or.jp/frontier/frontier89/mokuji_89.html

An energy-efficient adaptive lighting control scheme using indoor localization with prior position information Reviewed

K. Nakashima, E. Okamoto

Proc. International Conference on Information Technology and Electrical Engineering (ICITEE) 470 - 475 2015.10

Language：English Publishing type：Research paper (international conference proceedings)

A study on performance improvement of chaos MIMO scheme using advanced stochastic characteristics

IEICE Tech. Rep. 115 ( 288, RCS2015-195 ) 31 - 36 2015.10

Language：Japanese Publishing type：Research paper (other academic)

R&D Activities for 5G in IEICE Technical Committee on Radio Communication Systems Reviewed

H. Murata, E. Okamoto, M. Mikami, A. Okazaki, S. Suyama, T. Inoue, J. Mashino, T. Yamamoto, M. Taromaru

Proc. Asia-Pacific conference on communications (APCC) 250 - 256 2015.10

Language：English Publishing type：Research paper (international conference proceedings)

超小型光通信機器(SOTA）を用いた誤り訂正符号効果の実証実験

竹中秀樹, 小山善貞, 國森裕生, 高山佳久, 豊嶋守生, 岡本英二

第59回宇宙科学技術連合講演会講演集 ( 3F02 ) 1 - 4 2015.10

Language：Japanese Publishing type：Research paper (other academic)

Application of downlink non-orthogonal multiple access scheme for satellite/terrestrial integrated mobile communication system with dual satellites

E. Okamoto, H. Tsuji, A. Miura

IEICE Technical Report 115 ( 241, SAT2015-28 ) 39 - 44 2015.09

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

An improved proportional fair scheduling in downlink non-orthogonal multiple access system Reviewed

E. Okamoto

Proc. IEEE Vehicular Technology Conf. 2015 Fall (VTC-2015Fall) 1 - 5 2015.09

Language：English Publishing type：Research paper (international conference proceedings)

An accurate indoor-localization scheme with NLOS detection and elimination exploiting stochastic characteristics Reviewed

M. Horiba, E. Okamoto, T. Shinohara, K. Matsumura

IEICE Transactions on Communications E98-B ( 9 ) 1758 - 1767 2015.09

Language：English Publishing type：Research paper (scientific journal)

Other Link： http://search.ieice.org/bin/summary.php?id=e98-b_9_1758&category=B&year=2015&lang=E&abst=

Demonstration of Image transmission using Small Optical TrAnsponder (SOTA)

IEICE Tech. Rep. 115 ( 180, SAT2015-12 ) 7 - 9 2015.08

Language：Japanese Publishing type：Research paper (other academic)

Survey study on the role of satellite communications in 5G mobile network Invited

IEICE Tech. Rep. 115 ( 180, SAT2015-19 ) 47 - 52 2015.08

Language：Japanese Publishing type：Research paper (other academic)

Overview of R&D Activities for 5G in IEICE Technical Committee on Radio Communication Systems Invited

IEICE Tech. Rep. 115 ( 181, RCS2015-140 ) 49 - 54 2015.08

Language：Japanese Publishing type：Research paper (other academic)

A chaos MIMO transmission scheme using turbo principle for secure channel-coded transmission Reviewed

E. Okamoto, Y. Inaba

IEICE Transactions on Communications E98-B ( 8 ) 1482 - 1491 2015.08

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

DOI： 10.1587/transcom.E98.B.1482

Other Link： http://search.ieice.org/bin/summary.php?id=e98-b_8_1482&category=B&year=2015&lang=E&abst=

A study on improved scheme of subcarrier allocation order in downlink non-orthogonal multiple access

IEICE Tech. Rep. 115 ( 160, RCS2015-109 ) 49 - 54 2015.07

Language：Japanese Publishing type：Research paper (other academic)

Application of channel estimation scheme in uplink network coded communication between the high-speed moving terminals

IEICE Tech. Rep. 115 ( 113, RCS2015-69 ) 137 - 141 2015.06

Language：Japanese Publishing type：Research paper (other academic)

A study on EXIT chart analysis of chaos MIMO transmission scheme using turbo principle

IEICE Tech. Rep. 115 ( 113, RCS2015-77 ) 185 - 190 2015.06

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

Low-complexity indoor UWB localization scheme using particle swarm optimization Reviewed

E. Okamoto, M. Horiba, K. Nakashima, T. Shinohara, K. Matsumura

Nonlinear Theory and Its Applications, IEICE 6 ( 2 ) 194 - 206 2015.04

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

DOI： 10.1587/nolta.6.194

Other Link： https://www.jstage.jst.go.jp/article/nolta/6/2/6_194/_article

A study on transmission protocols in vehicle-to-vehicle cooperative communication using relay node

IEICE Tech. Rep. 114 ( 490, RCS2014-306 ) 29 - 34 2015.02

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

A study on performance improvement of vehicle-to-vehicle analog network coding scheme using relay node

IEICE Tech. Rep. 114 ( RCS2014-307 ) 35 - 40 2015.02

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

Consideration on energy-efficient adaptive linghting control scheme by using accurate indoor localization

Keita Nakashima, Manato Horiba, Eiji Okamoto, Toshiko Shinohara, Katsuhiko Matsumura

IEICE Tech. Rep. 114 ( 395, RCS2014-295 ) 151 - 156 2015.01

Language：Japanese Publishing type：Research paper (other academic)

An Improved NLOS Detection Scheme Using Stochastic Characteristics for Indoor Localization Reviewed

M. Horiba, E. Okamoto, T. Shinohara, K. Matsumura

Proc. International Conference on Information Networking (ICOIN2015) 478 - 482 2015.01

Language：English Publishing type：Research paper (international conference proceedings)

DOI： 10.1109/ICOIN.2015.7057951

Satellite/Terrestrial Integrated Mobile Communication System and Its Performance Improvement Invited

E. Okamoto, H. Tsuji, A. Miura

Proc. IEICE Vietnam-Japan International Symposium on Antennas and Propagation 72 - 76 2014.12

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

A Study on Key Exchange Protocol in Chaos MIMO Transmission Scheme

IEICE Tech. Rep. 114 ( 295, RCS2014-202 ) 31 - 36 2014.11

Language：Japanese Publishing type：Research paper (other academic)

地上/衛星共用携帯電話システムにおける多軸リソース割当によるスループット特性の改善 Reviewed

岡本英二,田中皓久,辻宏之,三浦周

電子情報通信学会論文誌Ｂ J97-B ( 11 ) 1009 - 1021 2014.11

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

Other Link： http://search.ieice.org/bin/summary.php?id=j97-b_11_1009&category=B&year=2014&lang=J&abst=

Study on decoding complexity reduction of chaos MIMO transmission scheme by applying M-algorithm

IEICE Technical Report 114 ( 254, RCS2014-181 ) 141 - 146 2014.10

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

Introduction of Student Pocket Notebook for Encouraging Self-motivated Learning Reviewed

134 ( 10 ) 555 - 556 2014.10

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

Other Link： https://www.jstage.jst.go.jp/article/ieejfms/134/10/134_555/_article/-char/ja/

Performance Improvement of Chaos MIMO Transmission Scheme Using Space-Time Block Coding Reviewed

E. Okamoto, Y. Inaba

Proc. International Symposium on Nonlinear Theory and its Applications (NOLTA 2014) 707 - 710 2014.09

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

Feasibility study of frequency sharing satellite/terrestrial integrated mobile communication system Reviewed

E. Okamoto, A. Tanaka, H. Tsuji, A. Miura

Proc. IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS2014) 1 - 5 2014.08

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

Electric Power Saving in Smart Grid Using Localization with Ultra Wide-Band Signals Reviewed

K. Nakashima, M. Horiba, E. Okamoto

Proc. IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS2014) 1 - 5 2014.08

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

Particle swarm optimization-based low-complexity three-dimensional UWB localization scheme Invited Reviewed

E. Okamoto, M. Horiba, K. Nakashima, T. Shinohara, K. Matsumura

Proc. International Conference on Ubiquitous and Future Networks (ICUFN2014) 1 120 - 124 2014.07

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

DOI： 10.1109/ICUFN.2014.6876763

Study on electric power saving scheme in smart grid using exact location with Ultla Wide-Band signals

114 ( 86, RCS2014-38 ) 37 - 42 2014.06

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

Study on desired to undesired power ratio of each link in satellite/terrestrial integrated mobile communication system using frequency sharing

114 ( 27, SAT2014-8 ) 39 - 44 2014.05

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

Study on Coding Parameters for a Small Optical Transponder Reviewed

H. Takenaka, Y. Takayama, Y. Koyama, Y. Munemasa, E. Okamoto, M. Akioka, M. Toyoshima

Proc. 2014 International Conference on Space Optical Systems and Applications (ICSOS2014) 1 1 - 3 2014.05

Language：English Publishing type：Research paper (international conference proceedings)

Comparative Study on Low-Rate Forward Error Correction Codes in Downlink Satellite-to-Ground Laser Communications Reviewed

H. Inoue, E. Okamoto, Y. Shoji, Y. Takayama, M. Toyoshima

Proc. 2014 International Conference on Space Optical Systems and Applications (ICSOS2014) 1 1 - 5 2014.05

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

Application of chaos communication into wireless transmission and schemes for its performance improvement Invited

114 ( 7, RCS2014-8 ) 37 - 42 2014.04

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

Multilevel Modulated Chaos MIMO Transmission Scheme with Physical Layer Security Reviewed

E. Okamoto,Y. Inaba

Nonlinear Theory and Its Applications, IEICE 5 ( 2 ) 140 - 156 2014.04

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

Multi-User Chaos MIMO-OFDM Scheme for Physical Layer Multi-Access Security Reviewed

Y. Inaba,E. Okamoto

Nonlinear Theory and Its Applications, IEICE 5 ( 2 ) 172 - 183 2014.04

Language：English Publishing type：Research paper (scientific journal)

Study on chaos MIMO transmission scheme using log likelihood ratio for application of turbo-like codes

113 ( 456, RCS2013-335 ) 175 - 180 2014.02

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

A Study on Subcarrier Allocation Scheme in MIMO-STBC-OFDMA Relay Networks

113 ( 456, RCS2013-370 ) 389 - 394 2014.02

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

A study on improvement of NLOS detection accuracy in TOA-based indoor localization

113 ( 399, ASN2013-123 ) 29 - 34 2014.01

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

A Study on Reduction of Decoding Complexity of Chaos MIMO-OFDM Scheme

113 ( 301, RCS2013-179 ) 31 - 36 2013.11

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

下りリンク光衛星通信に適した低符号化率消失訂正符号の一検討

井上拓昭,岡本英二,荘司洋三,高山佳久,豊嶋守生

第53回宇宙科学技術連合講演会講演集 1 - 5 2013.10

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

An improved NLOS detection scheme for Hybrid-TOA/AOA-based localization in indoor environments Reviewed

M. Horiba, E. Okamoto, T. Shinohara, K. Matsumura

Proc. IEEE International Conference on Ultra-Wideband (ICUWB 2013) 37 - 42 2013.09

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

Multi-user chaos MIMO-OFDM scheme for secure mobile communications Reviewed

E. Okamoto, Y. Inaba

Proc. 2013 International Symposium on Nonlinear Theory and its Applications (NOLTA 2013) 264 - 268 2013.09

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

Chaos-MIMO-OFDMA scheme achieving secure multiple access at physical-layer Reviewed

E. Okamoto, Y. Inaba, A. Tanaka,

Proc. IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS2013) 26 - 30 2013.08

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

An efficient channel estimation scheme using Walsh pilots in bi-directional wireless OFDM relay systems with analog network coding Reviewed

Y. Koshimizu, E. Okamoto

IEICE Transactions on Communications E96-B ( 8 ) 2119 - 2130 2013.08

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

An improved NLOS detection scheme in indoor Hybrid-TOA/AOA-based localization

132 ( 132, ASN2013-60 ) 77 - 82 2013.07

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

Interference-aware weighting scheme for satellite/terrestrial integrated mobile communication system Reviewed

A. Tanaka, E. Okamoto, H. Tsuji, Y. Fujino

Proc. IEEE International Wireless Communications and Mobile Computing Conference (IWCMC 2013) 1803 - 1808 2013.07

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

Multi-User Chaos MIMO-OFDM Scheme for Secure Wireless Communications

113 ( 93, RCS2013-38 ) 7 - 12 2013.06

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

Perspectives of channel coding for satellite laser communications Invited

113 ( 32, SAT2013-5 ) 25 - 30 2013.05

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

UWB最小二乗法位置推定における粒子群最適化法適用による計算量削減の検討

岡本英二

電子情報通信学会複雑コミュニケーションサイエンス研究会予稿集 ( 5 ) 53 - 58 2013.02

Language：Japanese Publishing type：Research paper (other academic)

Multilevel modulated chaos-MIMO transmission scheme with adaptive chaos processing

112 ( 443, RCS2012-350 ) 393 - 398 2013.02

Language：Japanese Publishing type：Research paper (other academic)

An efficient channel estimation scheme without feedback in bi-directional two-timeslot OFDM relay systems

Y. Koshimizu, E. Okamoto

112 ( 286, RCS2012-172 ) 67 - 72 2012.11

Language：Japanese Publishing type：Research paper (other academic)

Chaos MIMO transmission with variable chaos signal processing for performance improvement Reviewed

E. Okamoto

Proc. 2012 International Symposium on Nonlinear Theory and its Applications (NOLTA 2012) 666 - 669 2012.10

Language：English Publishing type：Research paper (international conference proceedings)

Throughput performance evaluation of interference-aware allocation and equalization scheme in satellite/terrestrial integrated mobile communication system

11 112 ( 239, RCS2012-136 ) 69 - 74 2012.10

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

Chaos MIMO-OFDM transmission scheme achieving physical-layer security in mobile channel environments

112 ( 239, RCS2012-125 ) 1 - 6 2012.10

Language：Japanese Publishing type：Research paper (other academic)

A LT-based multi-rate transmission scheme with fast decoding for satellite laser communication Reviewed

T. Inoue, T. Kyo, E. Okamoto, Y. Shoji, Y. Takayama, M. Toyoshima

Proc. 2012 International Conference on Space Optical Systems and Applications (ICSOS2012) 1 - 5 2012.10

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

Study on Error Coding Program for Implementation in SOTA Reviewed

H. Takenaka, M. Toyoshima, Y. Takayama, Y. Koyama, M. Akioka, E. Okamoto, T. Kyo

Proc. 2012 International Conference on Space Optical Systems and Applications (ICSOS2012) 1 - 3 2012.10

Language：English Publishing type：Research paper (international conference proceedings)

Performance Improvement of IMR-based NLOS Detection in indoor ultra wide-band TOA localization Reviewed

K. Fukuda, E. Okamoto

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E-95A ( 10 ) 1658 - 1666 2012.10

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

Multi-rate LDGM block transmission scheme for satellite laser communications

112 ( 191, SAT2012-27 ) 55 - 60 2012.08

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

A chaos MIMO-OFDM scheme for mobile communication with physical-layer security Invited

E. Okamoto

Proc. International Conference on Theory and Applications in Nonlinear Dynamics (ICAND 2012) 1 - 9 2012.08

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

Transmission experiments on OICETS repeater mode for verfication of channel coding effect Reviewed

E. Okamoto, Y. Shoji, M. Toyoshima, Y. Takayama

58 ( 1/2 ) 73 - 82 2012.07

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

A secure cooperative relay transmission using chaos MIMO scheme Invited Reviewed

E. Okamoto

Proc. International Conference on Ubiquitous and Future Networks (ICUFN2012) 374 - 378 2012.07

Language：English Publishing type：Research paper (international conference proceedings)

An effective channel estimation scheme for bi-directional two-timeslot OFDM relay transmission using analog network coding Reviewed

Y. Koshimizu,E. Okamoto

Proc. IEEE Vehicular Technology Conference 2012 Spring (VTC-S) 1 - 5 2012.05

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

双方向マルチホップネットワークにおけるスキャッタードパイロットによるチャネル推定手法の一検討

伊藤泰史,輿水佑太,岡本英二

電子情報通信学会技術研究報告 112 ( 11, RCS2012-5 ) 25 - 30 2012.04

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

A chaos MIMO transmission scheme for channel coding and physical-layer security Reviewed

E. Okamoto

IEICE Transactions on Communications E95-B ( 4 ) 1384 - 1392 2012.04

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

Performance improvement of chaos MIMO scheme by variable chaos signal processing

111 ( 451, RCS2011-331 ) 89 - 94 2012.03

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

Performance Improvement of TOA localization using IMR-based NLOS Detection in Sensor Networks Reviewed

K. Fukuda, E. Okamoto

Proc. International Conference on Information Networking (ICOIN) 1 13 - 18 2012.02

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

An improvement of rate estimation algorithm in the multi-rate LDGM code for the satellite laser communications

111 ( 437, SAT2011-70 ) 31 - 36 2012.02

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

A Markov-based satellite-to-ground optical channel model and its effective coding scheme Reviewed

Y. Yamashita, E. Okamoto, Y. Iwanami, Y. Shoji, M. Toyoshima, Y. Takayama

IEICE Transactions on Communications E95-B ( 1 ) 254 - 262 2012.01

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

An effective downlink resource allocation scheme based on MIMO-OFDMA-CDM in cellular system Reviewed

Y. Fuwa, E. Okamoto, Y. Iwanami

IEICE Transactions on Communications E94-B ( 12 ) 3550 - 3558 2011.12

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

直交符号とFFTを用いたMIMO-SC-FDEチャネル推定におけるパイロットシンボル配置の柔軟化に関する一検討

佐竹孝太,岡本英二,岩波保則

情報理論とその応用シンポジウム（SITA）予稿集 1 - 6 2011.12

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

An efficient multi-relay transmission scheme using LDGM code for satellite burst erasure channel Reviewed

T. Kyo, E. Okamoto, Y. Shoji, Y. Takayama, M. Toyoshima

Proc. AIAA International Communications Satellite Systems Conference (ICSSC-2011) AIAA2011 ( 8045 ) 1 - 12 2011.11

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

A study on channel estimation scheme in two-timeslot OFDM relay systems applying analog network coding

111 ( 289, RCS2011-228 ) 233 - 238 2011.11

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

Performance improvement of OFDMA cellular system using code division multiplexing in satellite/terrestrial integrated mobile communication system Reviewed

E. Okamoto,H. Tsuji,Y. Fujino

Proc. Int’l. Sym. Wireless Personal Multimedia Commun. (WPMC) 294 - 298 2011.10

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

Evaluation of the optical communication system for Small Optical Transponder (SOTA) based on the laboratory test Reviewed

H. Takenaka, M. Toyoshima, Y. Shoji, Y. Takayama, Y. Koyama, M. Akioka, E. Okamoto

Proc. International Astronautical Congress (IAC) IAC-11 ( B2.2.10 ) 1 - 5 2011.10

Language：English Publishing type：Research paper (international conference proceedings)

Performance improvement of NLOS detection scheme in TOA-based position estimation with sensor networks

111 ( 263, USN2011-55 ) 189 - 194 2011.10

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

A comparative study of bit error rate performance in chaos MIMO transmission system Reviewed

E. Okamoto

Proc. Int’l Sym. on Nonlinear Theory and its Applications (NOLTA) 33 - 36 2011.09

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

A study on multi-rate transmission using LDGM code for satellite-to-ground laser communications

111 ( 179, SAT2011-18 ) 13 - 17 2011.08

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

A multi-hop cooperative transmission scheme using LDGM codes for deep space-to-ground optical link

111 ( 179, SAT2011-17 ) 7 - 12 2011.08

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

LEO-to-ground optical link channel model and the performance improvement by LDGM code Invited

111 ( 179, SAT2011-16 ) 1 - 6 2011.08

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

A study on pilot and blind channel estimation scheme in two-way multi-hop MIMO-OFDM system

111 ( 94, RCS2011-56 ) 123 - 128 2011.06

Authorship：Lead author Language：Japanese Publishing type：Research paper (other academic)

Personal modulation

111 ( 94, RCS2011-43 ) 49 - 54 2011.06

Language：Japanese Publishing type：Research paper (other academic)

A chaos MIMO transmission scheme for secure communications on physical layer Reviewed

E. Okamoto

Proc. IEEE Vehicular Technology Conf. 2011Spring (VTC-S) 1 - 5 2011.05

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

Multi-rate low density generator matrix code for optical satellite communications Reviewed

3. H. Matsuo, E. Okamoto, Y. Iwanami, Y. Shoji, M. Toyoshima, Y. Takayama

Proc. IEEE Int’l Conf. on Space Optical Systems and Applications (ICSOS) 1 - 5 2011.05

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

Performance improvement of multi-user downlink MIMO-OFDMA-CDM using proportional fairness algorithm in multi-cell environments Reviewed

Yasuhiro Fuwa, Eiji Okamoto, Yasunori Iwanami

Proc. Joint International Information & Communication Technology, Electronic and Electrical Engineering (JICTEE) 1 - 5 2010.12

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

An efficient LDGM coding scheme for optical satellite-to-ground link based on a new channel model Reviewed

Y. Yamashita, E. Okamoto, Y. Iwanami, Y. Shoji, M. Toyoshima, Y. Takayama

Proc. IEEE Global communications conference (GLOBECOM) ( SAC05-3 ) 1 - 6 2010.12

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

Symbol-Based Soft Relaying Strategy for Cooperative Wireless Networks Reviewed

A. Abd Aziz, Y. Iwanami, E. Okamoto

Proc. IEEE Tencon 2010 1 - 5 2010.11

Language：English Publishing type：Research paper (international conference proceedings)

A Study on Dirty Paper Coding with a Maximum Beam in Multiuser MIMO Downlinks Reviewed

C. Li, Y. Iwanami, E. Okamoto

Proc. IEEE Tencon 2010 1 - 5 2010.11

Language：English Publishing type：Research paper (international conference proceedings)

An Evaluation on Throughput Performance for Type II Hybrid-ARQ Using Non-binary Rate-Compatible-Punctured LDPC Codes Reviewed

T. Kozawa, Y. Iwanami, E. Okamoto, R. Yamada, N. Okamoto,

IEICE Trans. on Fundamentals E93-A ( 11 ) 2089 - 2091 2010.11

Language：English Publishing type：Research paper (scientific journal)

A Comparative Study on Time Domain Sequential Equalizer with MLD and MLSE Equalizer on MIMO Frequency Selective Channels Reviewed

S. Nakanobu, Y. Iwanami, E. Okamoto

IEICE Trans. on Commun. E93-B ( 11 ) 3197 - 3202 2010.11

Language：English Publishing type：Research paper (scientific journal)

MIMO MFSK receivers using FDE and MLD on quasi-static frequency selective fading channels Reviewed

K. Nakayama, Y. Iwanami, E. Okamoto

Proc. Int’l Sym. Information Theory and Its Applications (ISITA) 1 - 5 2010.10

Language：English Publishing type：Research paper (international conference proceedings)

Performance improvement of inter-vehicle communications using multiple orthogonal modulation Reviewed

M. Fukushima, E. Okamoto, and Y. Iwanami

Proc. Int’l. Sym. Wireless Personal Multimedia Commun. (WPMC) 1 - 5 2010.10

Language：English Publishing type：Research paper (international conference proceedings)

Performance Improvement of Location Estimation Using Deviation on Received Signal Strength In Wireless Sensor Networks Reviewed

K. Miyauchi, E. Okamoto, and Y. Iwanami

Proc. IEEE International Conference on Ubiquitous and Future Networks (ICUFN 2010) 66 - 70 2010.06

Language：English Publishing type：Research paper (international conference proceedings)

Performance improvement of multi-user downlink MIMO-OFDMA-CDM using adaptive modulation Reviewed

Y. Fuwa, E. Okamoto, and Y. Iwanami

Proc. IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS) ( S05-4 ) 1 - 5 2010.05

Language：English Publishing type：Research paper (international conference proceedings)

On The Improvement of Maximum Likelihood Detection in Multiple Relay Systems Reviewed

A. A. Aziz, Y. Iwanami, and E. Okamoto

Proc. IEEE Wireless Commun. and Networking Conf. (WCNC) 1 - 6 2010.04

Language：English Publishing type：Research paper (international conference proceedings)

A fast fading channel estimation scheme for OFDM with sparse and scattered pilot symbols Reviewed

H. Hayashi, E. Okamoto, and Y. Iwanami

Proc. Int'l Sym. on Intelligent Signal Processing and Communication Systems (ISPACS) 154 - 157 2009.12

Language：English Publishing type：Research paper (international conference proceedings)

Efficient Combining Technique with A Low-Complexity Detect-and-Forward Relay for Cooperative Diversity Scheme Reviewed

A. A. Aziz, Y. Iwanami, and E. Okamoto

Proc. IEEE region ten conf. (Tencon) 6 pages 2009.11

Language：English Publishing type：Research paper (international conference proceedings)

Comparative study for Tomlinson -Harashima Precoding based on MMSE criteria in Multiuser MIMO downlink system Reviewed

C. Li, Y. Iwanami, and E. Okamoto

Proc. IEEE region ten conf. (Tencon) 6 pages 2009.11

Language：English Publishing type：Research paper (international conference proceedings)

Resource Allocation Scheme with Proportional Fairness for Multi-user Downlink MIMO-OFDMA-CDM Systems Reviewed

Y. Fuwa, E. Okamoto, and Y. Iwanami

Proc. IEEE Int'l Sym. on Commun. and Inf. Tech. (ISCIT) 588 - 593 2009.09

Language：English Publishing type：Research paper (international conference proceedings)

A Study on Sparse Pilot Symbol-Based Channel Estimation for Single Carrier-Frequency Domain Equalization Reviewed

D. Motokawa, E. Okamoto, and Y. Iwanami

Proc. Int'l. Sym. Wireless Personal Multimedia Commun. (WPMC) ( S16-2 ) 1 - 6 2009.09

Language：English Publishing type：Research paper (international conference proceedings)

A Study on Time Domain Sequential Equalizer with MLD and MLSE Equalizer on MIMO Frequency Selective Channels Reviewed

S. Nakanobu, Y. Iwanami, and E. Okamoto

Proc. Int'l. Sym. Wireless Personal Multimedia Commun. (WPMC) 5 pages 2009.09

Language：English Publishing type：Research paper (international conference proceedings)

A Study on LDPC Coded Hybrid-ARQ Using Spatially Multiplexed MIMO-OFDM Reviewed

Y. Tsuruta, Y. Iwanami, and E. Okamoto

Proc. Int'l. Sym. Wireless Personal Multimedia Commun. (WPMC) 5 pages 2009.09

Language：English Publishing type：Research paper (international conference proceedings)

A comparison of multicarrier transmission in multipath and impulsive noise channels Reviewed

M. Fukushima, E. Okamoto, and Y. Iwanami

Proc. IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS) 144 - 148 2009.08

Language：English Publishing type：Research paper (international conference proceedings)

Rate-compatible LDPC code using quasi-cyclic LDPC for optical satellite communications Reviewed

Y. Yamashita, E. Okamoto, Y. Iwanami, Y. Shoji, Y. Takayama, and M. Toyoshima

Proc. IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS) 199 - 203 2009.08

Language：English Publishing type：Research paper (international conference proceedings)

Results from Phase-4 Kirari Optical Communication Demonstration Experiments with the NICT Optical Ground Station (KODEN) Reviewed

M. Toyoshima, H. Takenaka, C. Schaefer, Miyashita, Y. Shoji, Y. Takayama, Y. Koyama, H. Kunimori, S. Yamakawa, and E. Okamoto

Proc. AIAA Int'l Commun. Satellite Systems Conf. ICSSC2009 - 3.4.2 2009.06

Language：English Publishing type：Research paper (international conference proceedings)

ディジタル通信における高度な変調方式を用いた高機能化 Invited

岡本英二

ケミカルエンジニアリング化学工業社 54 ( 5 ) 18 - 25 2009.05

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

LDPC code design for OICETS experiments in 2008 Reviewed

Y. Kadoike, E. Okamoto, Y. Iwanami, Y. Shoji, M. Toyoshima, Y. Takayama, and H. Kunimori

Proc. Int'l Conf. on Space Optical Systems and Applications 6 pages 2009.02

Language：English Publishing type：Research paper (international conference proceedings)

Development of LDPC codes by the gallager composition method on FPGA Reviewed

T. Tanaka, M. Abe, M. Morimoto, Y. Kadoike, E. Okamoto, Y. Shoji, and M. Toyoshima

Proc. Int'l Conf. on Space Optical Systems and Applications 6 pages 2009.02

Language：English Publishing type：Research paper (international conference proceedings)

An Improved Channel Estimation Scheme for Sparse and Scattered Pilot OFDM System Reviewed

H. Hayashi, E. Okamoto, and Y. Iwanami

Proc. IEEE VTS Asia Pacific Wireless Communications Symposium (APWCS) CD - ROM 5 pages 2008.08

Language：English Publishing type：Research paper (international conference proceedings)

拡張型Walsh符号によるMC-CDMAの伝送特性改善に関する検討 Reviewed

市川真己,王巍,岡本英二,岩波保則

電子情報通信学会論文誌Ｂ J91-B ( 4 ) 510 - 516 2008.04

Language：Japanese Publishing type：Research paper (scientific journal)

Performance Improvement of Turbo Equalization by Concatenating SC/MMSE Equalizer Reviewed

Y. Kadoike, E. Okamoto, and Y. Iwanami

Proc. Int'l. Sym. Wireless Personal Multimedia Commun. (WPMC) 353 - 357 2007.12

Language：English Publishing type：Research paper (international conference proceedings)

Application of turbo equalization for multimode block-coded modulation Reviewed

M. Sugawara, E. Okamoto, and Y. Iwanami

Proc. Int'l. Sym. Wireless Personal Multimedia Commun. (WPMC) 550 - 554 2007.12

Language：English Publishing type：Research paper (international conference proceedings)

A Time-Selective Fading Estimation Scheme for OFDM Reviewed

T. Kawaguchi, E. Okamoto, and Y. Iwanami

Proc. Int'l. Sym. Wireless Personal Multimedia Commun. (WPMC) 555 - 559 2007.12

Language：English Publishing type：Research paper (international conference proceedings)

Performance improvement of Haar-based wavelet packet modulation in multipath fading environment Reviewed

S. Maki, E. Okamoto, and Y. Iwanami

Proc. IEEE Int'l Sym. on Commun. and Inf. Tech. (ISCIT) 1021 - 1026 2007.10

Language：English Publishing type：Research paper (international conference proceedings)

LDPC符号を用いたターボ等化の特性改善に関する検討 Reviewed

松岡克宏,岡本英二,岩波保則

電子情報通信学会論文誌Ｂ J90-B ( 4 ) 432 - 436 2007.04

Language：Japanese Publishing type：Research paper (scientific journal)

An Improvement of Closed-Loop Transmit Diversity with Three Transmit Antennas Reviewed

M. Sugawara, E. Okamoto, and Y. Iwanami

Proc. Int'l Sym. Information Theory and Its Applications (ISITA) 678 - 682 2006.10

Language：English Publishing type：Research paper (international conference proceedings)

A new Walsh-based spreading code for MC-CDMA adaptive multiple transmissions Reviewed

M. Ichikawa, E. Okamoto, and Y. Iwanami

Proc. Int'l. Sym. Wireless Personal Multimedia Commun. (WPMC) 726 - 730 2006.09

Language：English Publishing type：Research paper (international conference proceedings)

An Equalization Scheme of OFDM using 2D-FFT Reviewed

T. Kawaguchi, E. Okamoto, and Y. Iwanami

Proc. Int'l. Sym. Wireless Personal Multimedia Commun. (WPMC) 706 - 710 2006.09

Language：English Publishing type：Research paper (international conference proceedings)

A trellis-coded chaotic modulation scheme Reviewed

E. Okamoto and Y. Iwanami

Proc. IEEE Int'l Conf. Commun. (ICC) ( 11 ) 5010 - 5015 2006.06

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

A wavelet packet modulation method for satellite communications Reviewed

H. Sakakibara, E. Okamoto, and Y. Iwanami

Proc. IEEE region ten conf. (Tencon) 446 - 451 2005.11

Language：English Publishing type：Research paper (international conference proceedings)

A higher rate turbo equalization with multilevel block-coded modulation Reviewed

K. Matsuoka, E. Okamoto, and Y. Iwanami

Proc. IEEE region ten conf. (Tencon) 1711 - 1716 2005.11

Language：English Publishing type：Research paper (international conference proceedings)

Application of Wavelet Packet Modulation to Mobile Communication Reviewed

Eiji OKAMOTO, Yasunori IWANAMI, Tetsushi IKEGAMI

IEICE Transactions on Fundamentals 87 ( 10 ) 2684 - 2691 2004.10

Language：English Publishing type：Research paper (scientific journal)

Precise Multi-Path Fading Compensation Method using FFT Reviewed

Y. Sakai, E. Okamoto, and Y. Iwanami

Proc. Int'l Sym. Information Theory and Its Applications (ISITA) 718 - 721 2004.10

Language：English Publishing type：Research paper (international conference proceedings)

A block-coded modulation method for one-way multi-mode data transmission Reviewed

Eiji OKAMOTO, Hiroyo OGAWA

IEEE Transactions on Communications 50 ( 12 ) 2124 - 2135 2002.12

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

A pilot-symbol-assisted fading and frequency-offset compensation method using FFT Reviewed

Eiji OKAMOTO, Huan-Bang LI, Tetsushi IKEGAMI

IEICE Transactions on Fundamentals E85-A ( 7 ) 1656 - 1664 2002.07

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

直交ウェーブレット変調を用いたパルス状雑音下での伝送方法に関する一検討 Reviewed

岡本　英二，李　還幇，田中　正人，若菜　弘充，小川　博世

電子情報通信学会論文誌B J84-B ( 7 ) 1163 - 1175 2001.07

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

COMETS搭載移動体衛星通信用機器（MCE）の軌道上性能 Reviewed

斉藤春夫，三浦周，小原徳昭，岡本英二，山本伸一，森川栄久，小園晋一，若菜弘充

電子情報通信学会論文誌B J84-B ( 4 ) 731 - 740 2001.04

Language：Japanese Publishing type：Research paper (scientific journal)

フェージング下における16QAMを用いたブロック符号化変調方式の一検討 Reviewed

岡本　英二，李　還幇，田中　正人，若菜　弘充

電子情報通信学会論文誌B J83-B ( 3 ) 276 - 288 2000.03

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

Rayleigh fading compensation for 16QAM using FFT Reviewed

Eiji OKAMOTO, Huan-Bang LI, Tetsushi IKEGAMI

IEEE Transactions on Vehicular Technology 48 1626 - 1633 1999.09

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

技術試験衛星VI型を用いた高仰角陸上移動伝搬特性の測定 Reviewed

山本伸一，岡本英二，吉村直子，井家上哲史，若菜弘充

電子情報通信学会論文誌B-II J81-B-II ( 5 ) 381 - 390 1998.05

Language：Japanese Publishing type：Research paper (scientific journal)

分布集中定数系混在モデルによる多導体高速信号伝送路の過渡解析 Reviewed

市川哲，岡本英二，奥村浩士

電子情報通信学会論文誌A J80-A ( 1 ) 83 - 90 1997.01

Language：Japanese Publishing type：Research paper (scientific journal)

ラプラス変換対の数値処理に関する一検討 Reviewed

市川哲，岡本英二

電子情報通信学会論文誌A J77-A ( 8 ) 1192 - 1195 1994.08

Language：Japanese Publishing type：Research paper (scientific journal)

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