Determination of submitters suspected of pretending to be someone else to manipulate message evaluations in a communication site. - Naoki Ishikawa; Ryo Nishimura; Yasuhiko Watanabe; Masaki Murata; Yoshihiro Okada (IADIS AC (2), 2009)

Detection of Submitters Suspected of Pretending to be Someone Else to Manipulate Communications in a Community Site. - Naoki Ishikawa; Ryo Nishimura; Yasuhiko Watanabe; Yoshihiro Okada; Masaki Murata (CSEDU (1), 2010)

Detection of submitters suspected of pretending to be someone else in a community site. - Naoki Ishikawa; Ryo Nishimura; Yasuhiko Watanabe; Yoshihiro Okada; Masaki Murata (LREC, 2010)

Detection of users suspected of using multiple user accounts and manipulating evaluations in a community site. - Naoki Ishikawa; Kenji Umemoto; Yasuhiko Watanabe; Yoshihiro Okada; Ryo Nishimura; Masaki Murata (NLPKE, 2010)

Detection of Users Suspected of Pretending to Be Other Users in a Community Site by Using Messages Submitted to Non-Target Categories. - Naoki Ishikawa; Ryo Nishimura; Yasuhiko Watanabe; Masaki Murata; Yoshihiro Okada (PACLIC, 2010)

Single- and Multiple-RF Aided Non-Coherent Generalized Spatial Modulation. - Naoki Ishikawa; Shinya Sugiura (VTC Spring, 2014)

Unified Differential Spatial Modulation. - Naoki Ishikawa; Shinya Sugiura (IEEE Wirel. Commun. Lett., 2014)

Exit-Chart-Based Design of Irregular Precoded Power-Imbalanced Optical Spatial Modulation. - Naoki Ishikawa; Shinya Sugiura (VTC Fall, 2015)

Subcarrier-Index Modulation Aided OFDM - Will It Work? - Naoki Ishikawa; Shinya Sugiura; Lajos Hanzo (IEEE Access, 2016)

Algebraic Differential Spatial Modulation Is Capable of Approaching the Performance of Its Coherent Counterpart. - Rakshith Rajashekar; Chao Xu 005; Naoki Ishikawa; Shinya Sugiura; K. V. S. Hari; Lajos Hanzo (IEEE Trans. Commun., 2017)

Generalized-Spatial-Modulation-Based Reduced-RF-Chain Millimeter-Wave Communications. - Naoki Ishikawa; Rakshith Rajashekar; Shinya Sugiura; Lajos Hanzo (IEEE Trans. Veh. Technol., 2017)

Full-Diversity Dispersion Matrices From Algebraic Field Extensions for Differential Spatial Modulation. - Rakshith Rajashekar; Naoki Ishikawa; Shinya Sugiura; K. V. S. Hari; Lajos Hanzo (IEEE Trans. Veh. Technol., 2017)

Rectangular Differential Spatial Modulation for Open-Loop Noncoherent Massive-MIMO Downlink. - Naoki Ishikawa; Shinya Sugiura (IEEE Trans. Wirel. Commun., 2017)

50 Years of Permutation, Spatial and Index Modulation: From Classic RF to Visible Light Communications and Data Storage. - Naoki Ishikawa; Shinya Sugiura; Lajos Hanzo (IEEE Commun. Surv. Tutorials, 2018)

Differential Space-Time Coding Dispensing With Channel Estimation Approaches the Performance of Its Coherent Counterpart in the Open-Loop Massive MIMO-OFDM Downlink. - Naoki Ishikawa; Rakshith Rajashekar; Chao Xu 005; Shinya Sugiura; Lajos Hanzo (IEEE Trans. Commun., 2018)

Single-RF Index Shift Keying Aided Differential Space-Time Block Coding. - Chao Xu 005; Rakshith Rajashekar; Naoki Ishikawa; Shinya Sugiura; Lajos Hanzo (IEEE Trans. Signal Process., 2018)

Designing of a Network Infrastructure to Promote Active Participation of Youth in Local Community Revitalization. - Naoki Ishikawa; Atsushi Shimoda; Hironori Takuma (IIAI-AAI, 2019)

IMToolkit: An Open-Source Index Modulation Toolkit for Reproducible Research Based on Massively Parallel Algorithms. - Naoki Ishikawa (IEEE Access, 2019)

Nulls in the Air: Passive and Low-Complexity QoS Estimation Method for a Large-Scale Wi-Fi Network Based on Null Function Data Frames. - Naoki Ishikawa; Yasuhiro Ohishi; Kaori Maeda (IEEE Access, 2019)

Multicarrier Division Duplex Aided Millimeter Wave Communications. - Rakshith Rajashekar; Chao Xu 005; Naoki Ishikawa; Lie-Liang Yang; Lajos Hanzo (IEEE Access, 2019)

Sixty Years of Coherent Versus Non-Coherent Tradeoffs and the Road From 5G to Wireless Futures. - Chao Xu 005; Naoki Ishikawa; Rakshith Rajashekar; Shinya Sugiura; Robert G. Maunder; Zhaocheng Wang 001; Lie-Liang Yang; Lajos Hanzo (IEEE Access, 2019)

"Near-Perfect" Finite-Cardinality Generalized Space-Time Shift Keying. - Chao Xu 005; Peichang Zhang; Rakshith Rajashekar; Naoki Ishikawa; Shinya Sugiura; Zhaocheng Wang 001; Lajos Hanzo (IEEE J. Sel. Areas Commun., 2019)

Differential-Detection Aided Large-Scale Generalized Spatial Modulation is Capable of Operating in High-Mobility Millimeter-Wave Channels. - Naoki Ishikawa; Rakshith Rajashekar; Chao Xu 005; Mohammed El-Hajjar; Shinya Sugiura; Lie-Liang Yang; Lajos Hanzo (IEEE J. Sel. Top. Signal Process., 2019)

Finite-Cardinality Single-RF Differential Space-Time Modulation for Improving the Diversity-Throughput Tradeoff. - Chao Xu 005; Peichang Zhang; Rakshith Rajashekar; Naoki Ishikawa; Shinya Sugiura; Li Wang 024; Lajos Hanzo (IEEE Trans. Commun., 2019)

Subcarrier Subset Selection-Aided Transmit Precoding Achieves Full-Diversity in Index Modulation. - Rakshith Rajashekar; Chao Xu 005; Naoki Ishikawa; Lie-Liang Yang; Lajos Hanzo (IEEE Trans. Veh. Technol., 2019)

Differentially-Encoded Rectangular Spatial Modulation Approaches the Performance of Its Coherent Counterpart. - Lixia Xiao; Pei Xiao 001; Hang Ruan; Naoki Ishikawa; Lei Lu; Yue Xiao 001; Lajos Hanzo (IEEE Trans. Commun., 2020)

Optimal but Low-Complexity Optimization Method for Nonsquare Differential Massive MIMO. - Yuma Katsuki; Naoki Ishikawa (VTC Fall, 2021)

Quantum Speedup for Index Modulation. - Naoki Ishikawa (IEEE Access, 2021)

Artificially Time-Varying Differential MIMO for Achieving Practical Physical Layer Security. - Naoki Ishikawa; Jehad M. Hamamreh; Eiji Okamoto; Chao Xu 005; Lixia Xiao (IEEE Open J. Commun. Soc., 2021)

Space-, Time- and Frequency-Domain Index Modulation for Next-Generation Wireless: A Unified Single-/Multi-Carrier and Single-/Multi-RF MIMO Framework. - Chao Xu 005; Yifeng Xiong; Naoki Ishikawa; Rakshith Rajashekar; Shinya Sugiura; Zhaocheng Wang 001; Soon Xin Ng; Lie-Liang Yang; Lajos Hanzo (IEEE Trans. Wirel. Commun., 2021)

Analysis of Secret Key Agreement Protocol for Massive MIMO Systems. - Seiya Otsuka; Hiroki Iimori; Kengo Ando; Giuseppe Thadeu Freitas de Abreu; Koji Ishibashi; Naoki Ishikawa (CISIS-ICEUTE, 2022)

Qubit Reduction and Quantum Speedup for Wireless Channel Assignment Problem. - Yuki Sano; Masaya Norimoto; Naoki Ishikawa (CoRR, 2022)

Error Probability Analysis for Time-Varying Chaos Unitary Matrix-Based Differential MIMO System. - Xiaodan Zhai; Guochao Song; Lixia Xiao; Guanghua Liu; Naoki Ishikawa; Tao Jiang 002 (IEEE Wirel. Commun. Lett., 2022)

Multiple Superimposed Pilots for Accurate Channel Estimation in Orthogonal Time Frequency Space Modulation. - Yuta Kanazawa; Hiroki Iimori; Chandan Pradhan; Szabolcs Malomsoky; Naoki Ishikawa (VTC Fall, 2023)

Grover Adaptive Search for Joint Maximum-Likelihood Detection of Power-Domain Non-Orthogonal Multiple Access. - Masaya Norimoto; Naoki Ishikawa (VTC2023-Spring, 2023)

Noncoherent Massive MIMO With Embedded One-Way Function Physical Layer Security. - Yuma Katsuki; Giuseppe Thadeu Freitas de Abreu; Koji Ishibashi; Naoki Ishikawa (IEEE Trans. Inf. Forensics Secur., 2023)

A New Noncoherent Gaussian Signaling Scheme for Low Probability of Detection Communications. - Yuma Katsuki; Giuseppe Thadeu Freitas de Abreu; Koji Ishibashi; Naoki Ishikawa (IEEE Wirel. Commun. Lett., 2023)

Quantum Algorithm for Higher-Order Unconstrained Binary Optimization and MIMO Maximum Likelihood Detection. - Masaya Norimoto; Ryuhei Mori; Naoki Ishikawa (IEEE Trans. Commun., 2023)

On the Capacity of Generalized Quadrature Spatial Modulation. - Kein Yukiyoshi; Naoki Ishikawa (IEEE Wirel. Commun. Lett., 2023)

AFDM Chirp-Permutation-Index Modulation with Quantum-Accelerated Codebook Design. - Hyeon Seok Rou; Kein Yukiyoshi; Taku Mikuriya; Giuseppe Thadeu Freitas de Abreu; Naoki Ishikawa (IEEECONF, 2024)

Deep Neural Network Based Reduced-Complexity Detector for Grassmann Constellation. - Ryusei Baba; Hiroki Iimori; Chandan Pradhan; Szabolcs Malomsoky; Naoki Ishikawa (VTC Fall, 2024)

Performance Analysis of Data-Carrying Reference Signal in Time-Varying Channels. - Taiki Kato; Hiroki Iimori; Chandan Pradhan; Szabolcs Malomsoky; Naoki Ishikawa (VTC Spring, 2024)

Grover Adaptive Search for Maximum Likelihood Detection of Generalized Spatial Modulation. - Kein Yukiyoshi; Taku Mikuriya; Hyeon Seok Rou; Giuseppe Thadeu Freitas de Abreu; Naoki Ishikawa (VTC Fall, 2024)

Quantum Speedup for Multiuser Detection With Optimized Parameters in Grover Adaptive Search. - Masaya Norimoto; Taku Mikuriya; Naoki Ishikawa (IEEE Access, 2024)

Quantum Speedup for Polar Maximum Likelihood Decoding. - Shintaro Fujiwara; Naoki Ishikawa (CoRR, 2024)

Boosting Spectral Efficiency With Data-Carrying Reference Signals on the Grassmann Manifold. - Naoki Endo; Hiroki Iimori; Chandan Pradhan; Szabolcs Malomsoky; Naoki Ishikawa (IEEE Trans. Wirel. Commun., 2024)

Quantum search algorithm for binary constant weight codes. - Kein Yukiyoshi; Naoki Ishikawa (Quantum Inf. Process., 2024)

Maximizing Spectrum Efficiency of Data-Carrying Reference Signals via Bayesian Optimization. - Taiki Kato; Hiroki Iimori; Chandan Pradhan; Szabolcs Malomsoky; Naoki Ishikawa (IEEE Open J. Commun. Soc., 2025)

Covert Communications Without Pre-Sharing of Side Information and Channel Estimation Over Quasi-Static Fading Channels. - Hiroki Fukada; Hiroki Iimori; Chandan Pradhan; Szabolcs Malomsoky; Naoki Ishikawa (IEEE Wirel. Commun. Lett., 2025)