Hiroki Iimori

71 papers B 9Misc 4Journal 38Unranked 20
YearRankTypeTitle / Venue / Authors
2026 J jnl
Joint Channel and Data Estimation for Multiuser Extremely Large-Scale MIMO Systems.
IEEE Trans. Wirel. Commun.
Kabuto Arai, Koji Ishibashi, Hiroki Iimori, Paulo Valente Klaine, Szabolcs Malomsoky
2026 J jnl
Reciprocity Calibration of Dual-Antenna Repeaters via MMSE Estimation.
CoRR
Shoma Hara, Takumi Takahashi, Hiroki Iimori, Hideki Ochiai, Erik G. Larsson
2026 J jnl
Repeater-Assisted MIMO Can Also Boost Frequency Diversity: A Semi-Analytic Study.
CoRR
Hiroki Iimori, Yuto Hama
2026 J jnl
Sparse Grassmannian Design for Noncoherent Codes via Schubert Cell Decomposition.
CoRR
Joe Asano, Yuto Hama, Hiroki Iimori, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa
2026 J jnl
Sparse Grassmannian Design for Noncoherent Codes via Schubert Cell Decomposition.
IEEE Open J. Commun. Soc.
Joe Asano, Yuto Hama, Hiroki Iimori, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa
2026 J jnl
Superimposed Pilot-Based OTFS: Will It Work?
IEEE Trans. Veh. Technol.
Yuta Kanazawa, Hiroki Iimori, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa
2025 J jnl
Achieving Distributed MIMO Performance with Repeater-Assisted Cellular Massive MIMO.
IEEE Commun. Mag.
Sara Willhammar, Hiroki Iimori, Joao Vieira, Lars Sundström, Fredrik Tufvesson, Erik G. Larsson
2025 B conf
Beam-Delay Domain Denoising via Compact Neural Filtering for OFDM Channel Estimation.
GLOBECOM
Kengo Ando, Huu Binh Minh Tran, Chandan Pradhan, Hiroki Iimori, Szabolcs Malomsoky
2025 — conf
Beamforming Design for Terrestrial-Satellite Spectrum Sharing in Upper Mid-Band Based on Angular Radiated Power Constraint.
ICC
Kohei Ueda, Koji Ishibashi, Hiroki Iimori, Paulo Valente Klaine, Szabolcs Malomsoky
2025 B conf
Complex-Valued Transformer with Improved Positional Embedding for MIMO-OFDM Channel Denoising.
GLOBECOM
Huu Binh Minh Tran, Kengo Ando, Chandan Pradhan, Hiroki Iimori, Szabolcs Malomsoky
2025 J jnl
Covert Communications Without Pre-Sharing of Side Information and Channel Estimation Over Quasi-Static Fading Channels.
IEEE Wirel. Commun. Lett.
Hiroki Fukada, Hiroki Iimori, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa
2025 J jnl
Efficient Joint Transmit and Receive Beam Alignment via Sequential CNN LSTM Networks.
IEEE Access
Takumi Yoshida, Koji Ishibashi, Hiroki Iimori, Paulo Valente Klaine, Szabolcs Malomsoky
2025 J jnl
Maximizing Spectrum Efficiency of Data-Carrying Reference Signals via Bayesian Optimization.
IEEE Open J. Commun. Soc.
Taiki Kato, Hiroki Iimori, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa
2024 J jnl
Achieving Distributed MIMO Performance with Repeater-Assisted Cellular Massive MIMO.
CoRR
Sara Willhammar, Hiroki Iimori, Joao Vieira, Lars Sundström, Fredrik Tufvesson, Erik G. Larsson
2024 J jnl
Bayesian Bilinear Inference for Joint Channel Tracking and Data Detection in Millimeter-Wave MIMO Systems.
IEEE Trans. Wirel. Commun.
Takumi Takahashi, Hiroki Iimori, Koji Ishibashi, Shinsuke Ibi, Giuseppe Thadeu Freitas de Abreu
2024 J jnl
Boosting Spectral Efficiency With Data-Carrying Reference Signals on the Grassmann Manifold.
IEEE Trans. Wirel. Commun.
Naoki Endo, Hiroki Iimori, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa
2024 J jnl
Boosting Spectral Efficiency with Data-Carrying Reference Signals on the Grassmann Manifold.
CoRR
Naoki Endo, Hiroki Iimori, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa
2024 — conf
Deep Neural Network Based Reduced-Complexity Detector for Grassmann Constellation.
VTC Fall
Ryusei Baba, Hiroki Iimori, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa
2024 J jnl
Efficient Channel Tracking Based on Compressive Sensing for OFDM Millimeter-Wave Systems.
IEEE Trans. Veh. Technol.
Sota Uchimura, Koji Ishibashi, Hiroki Iimori, Paulo Valente Klaine, Szabolcs Malomsoky
2024 — conf
Near-Field Channel Estimation for Uplink Multiuser XL-MIMO Systems.
SPAWC
Kabuto Arai, Koji Ishibashi, Hiroki Iimori, Paulo Valente Klaine, Szabolcs Malomsoky
2024 — conf
Performance Analysis of Data-Carrying Reference Signal in Time-Varying Channels.
VTC Spring
Taiki Kato, Hiroki Iimori, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa
2023 B conf
Amplification Strategy in Repeater-Assisted MIMO Systems via Minorization Maximization.
GLOBECOM
Hiroki Iimori, Eito Kurihara, Takumi Yoshida, Joao Vieira, Szabolcs Malomsoky
2023 J jnl
Bayesian Receiver Design via Bilinear Inference for Cell-Free Massive MIMO With Low-Resolution ADCs.
IEEE Trans. Wirel. Commun.
Takumi Takahashi, Hiroki Iimori, Kengo Ando, Koji Ishibashi, Shinsuke Ibi, Giuseppe Thadeu Freitas de Abreu
2023 — conf
Multiple Superimposed Pilots for Accurate Channel Estimation in Orthogonal Time Frequency Space Modulation.
VTC Fall
Yuta Kanazawa, Hiroki Iimori, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa
2023 J jnl
Outage-Minimization Coordinated Multi-Point for Millimeter-Wave OFDM With Random Blockages.
IEEE Trans. Veh. Technol.
Sota Uchimura, Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
2023 B conf
Radio Unit Configuration for Dynamic Time Division Duplex in Distributed MIMO Systems.
GLOBECOM
Hiroki Iimori, Jörg Huschke, Joao Vieira
2023 Misc conf
Wireless Location Tracking via Complex-Domain Super MDS with Time Series Self-Localization Information.
ICASSP
Yuya Nishi, Takumi Takahashi, Hiroki Iimori, Giuseppe Abreu, Shinsuke Ibi, Seiichi Sampei
2022 — conf
An Iterative Discrete Least Square Estimator with Dynamic Parameterization via Deep-Unfolding.
IEEECONF
Kengo Ando, Hiroki Iimori, Hyeon Seok Rou, Giuseppe Thadeu Freitas de Abreu, David González González, Osvaldo Gonsa
2022 — conf
Analysis of Secret Key Agreement Protocol for Massive MIMO Systems.
CISIS-ICEUTE
Seiya Otsuka, Hiroki Iimori, Kengo Ando, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi, Naoki Ishikawa
2022 — conf
Grant-Free Access for Extra-Large MIMO Systems Subject to Spatial Non-Stationarity.
ICC
Hiroki Iimori, Takumi Takahashi, Hyeon Seok Rou, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu, David González G., Osvaldo Gonsa
2022 — conf
Grant-Free NOMA Using Time-Delay Domain for Low-Latency Massive Access over MIMO-OFDM.
ICC
Takanori Hara, Hiroki Iimori, Koji Ishibashi
2022 J jnl
Joint Access Configuration and Beamforming for Cell-Free Massive MIMO Systems With Dynamic TDD.
IEEE Access
Shuto Fukue, Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
2022 J jnl
Joint Activity and Channel Estimation for Extra-Large MIMO Systems.
IEEE Trans. Wirel. Commun.
Hiroki Iimori, Takumi Takahashi, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu, David González G., Osvaldo Gonsa
2022 J jnl
Quantization-Aided Secrecy: FD C-RAN Communications With Untrusted Radios.
IEEE Trans. Wirel. Commun.
Omid Taghizadeh, Tianyu Yang, Hiroki Iimori, Giuseppe Abreu, Ali Cagatay Cirik, Rudolf Mathar
2022 J jnl
Scalable Quadrature Spatial Modulation.
IEEE Trans. Wirel. Commun.
Hyeon Seok Rou, Giuseppe Thadeu Freitas de Abreu, Hiroki Iimori, David González G., Osvaldo Gonsa
2022 J jnl
User-Heterogeneous Cell-Free Massive MIMO Downlink and Uplink Beamforming via Tensor Decomposition.
IEEE Open J. Commun. Soc.
Kengo Ando, Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
2021 J jnl
A Stochastic Gradient Descent Approach for Hybrid mmWave Beamforming With Blockage and CSI-Error Robustness.
IEEE Access
Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Omid Taghizadeh, Razvan-Andrei Stoica, Takanori Hara, Koji Ishibashi
2021 J jnl
Full-Duplex Amplify-and-Forward MIMO Relaying: Design and Performance Analysis Under Erroneous CSI and Hardware Impairments.
IEEE Open J. Commun. Soc.
Omid Taghizadeh, Slawomir Stanczak, Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu
2021 J jnl
Grant-Free Access via Bilinear Inference for Cell-Free MIMO With Low-Coherence Pilots.
IEEE Trans. Wirel. Commun.
Hiroki Iimori, Takumi Takahashi, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu, Wei Yu
2021 J jnl
Hyperparameter-Free Receiver for Grant-Free NOMA Systems With MIMO-OFDM.
IEEE Wirel. Commun. Lett.
Takanori Hara, Hiroki Iimori, Koji Ishibashi
2021 J jnl
Low Latency Beam-Sweeping for Millimeter Wave Systems via Pessimistic Optimization.
IEEE Wirel. Commun. Lett.
Andre Saito Guerreiro, Hiroki Iimori, Koji Ishibashi
2021 J jnl
Mitigating Channel Aging and Phase Noise in Millimeter Wave MIMO Systems.
IEEE Trans. Veh. Technol.
Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, David González G., Osvaldo Gonsa
2021 J jnl
Quantization-Aided Secrecy: FD C-RAN Communications with Untrusted Radios.
CoRR
Omid Taghizadeh, Tianyu Yang, Hiroki Iimori, Giuseppe Abreu, Ali Cagatay Cirik, Rudolf Mathar
2021 J jnl
Robust Symbol Detection in Large-Scale Overloaded NOMA Systems.
IEEE Open J. Commun. Soc.
Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Takanori Hara, Koji Ishibashi, Razvan-Andrei Stoica, David González G., Osvaldo Gonsa
2021 J jnl
Uplink Signal Detection for Scalable Cell-Free Massive MIMO Systems With Robustness to Rate-Limited Fronthaul.
IEEE Access
Kengo Ando, Hiroki Iimori, Takumi Takahashi, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu
2020 — conf
Activity Detection for Uplink Grant-Free NOMA in the Presence of Carrier Frequency Offsets.
ICC Workshops
Takanori Hara, Hiroki Iimori, Koji Ishibashi
2020 Misc conf
Discrete-Aware Matrix Completion via Proximal Gradient.
ACSSC
Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Omid Taghizadeh, Koji Ishibashi
2020 J jnl
Discreteness-aware Receivers for Overloaded MIMO Systems.
CoRR
Hiroki Iimori, Razvan-Andrei Stoica, Giuseppe Thadeu Freitas de Abreu, G. David Gonzalez, Andreas Andrae, Osvaldo Gonsa
2020 B conf
Full-Duplex AF MIMO Relaying: Impairments Aware Design and Performance Analysis.
GLOBECOM
Omid Taghizadeh, Slawomir Stanczak, Hiroki Iimori, Giuseppe Abreu
2020 J jnl
Full-Duplex Amplify-and-Forward MIMO Relaying: Impairments Aware Design and Performance Analysis.
CoRR
Omid Taghizadeh, Slawomir Stanczak, Hiroki Iimori, Giuseppe Abreu
2020 B conf
Full-Duplex MIMO Systems with Hardware Limitations and Imperfect Channel Estimation.
GLOBECOM
Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
2020 — conf
Low-Complexity Robust Beamforming with Blockage Prediction for Millimeter-Wave Communications.
APSIPA
Ryo Okabe, Hiroki Iimori, Koji Ishibashi
2020 J jnl
Minimizing Age of Information in Energy Harvesting Wireless Sensor Networks.
IEEE Access
Naoya Hirosawa, Hiroki Iimori, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu
2020 — conf
Robust Sparse Reconstruction of mmWave Channel Estimates via Fractional Programming.
ICOIN
Hiroki Iimori, Razvan-Andrei Stoica, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu
2020 J jnl
Stochastic Learning Robust Beamforming for Millimeter-Wave Systems With Path Blockage.
IEEE Wirel. Commun. Lett.
Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Omid Taghizadeh, Razvan-Andrei Stoica, Takanori Hara, Koji Ishibashi
2019 — conf
Age-of-Information Minimization in Two-User Multiple Access Channel with Energy Harvesting.
CAMSAP
Naoya Hirosawa, Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
2019 B conf
Fractional Programming for Robust TX BF Design in Multi-User/Single-Carrier PD-NOMA.
WiOpt
Hiroki Iimori, Giuseppe Abreu, Koji Ishibashi
2019 J jnl
Frame Theory and Fractional Programming for Sparse Recovery-Based mmWave Channel Estimation.
IEEE Access
Razvan-Andrei Stoica, Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
2019 Misc conf
Joint Detection in Massive Overloaded Wireless Systems via Mixed-Norm Discrete Vector Decoding.
ACSSC
Hiroki Iimori, Giuseppe Abreu, David González G., Osvaldo Gonsa
2019 J jnl
MIMO Beamforming Schemes for Hybrid SIC FD Radios With Imperfect Hardware and CSI.
IEEE Trans. Wirel. Commun.
Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, George C. Alexandropoulos
2019 — conf
Multiuser Detection for Large Massively Concurrent NOMA Systems via Fractional Programming.
CAMSAP
Razvan-Andrei Stoica, Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu
2019 Misc conf
Sparsely-structured Multiuser Detection for Large Massively Concurrent NOMA Systems.
ACSSC
Razvan-Andrei Stoica, Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu
2019 B conf
Transmission Strategies in Imperfect Bi-directional Full-Duplex MIMO Systems.
WCNC
Hiroki Iimori, Giuseppe Abreu, Koji Ishibashi, George C. Alexandropoulos
2018 — conf
A Frame-Theoretic Scheme for Robust Millimeter Wave Channel Estimation.
VTC Fall
Razvan-Andrei Stoica, Giuseppe Thadeu Freitas de Abreu, Hiroki Iimori
2018 — conf
Full-Duplex Bi-directional MIMO under Imperfect CSI and Hardware Impairments.
WPNC
Hiroki Iimori, Giuseppe Abreu, George C. Alexandropoulos
2018 — conf
Full-Duplex Transmission Optimization for Bi-directional MIMO links with QoS Guarantees.
GlobalSIP
Hiroki Iimori, Giuseppe Abreu, George C. Alexandropoulos
2018 J jnl
Full-Duplex Transmission Optimization for Bi-directional MIMO links with QoS Guarantees.
CoRR
Hiroki Iimori, Giuseppe Abreu, George C. Alexandropoulos
2018 — conf
Performance Analysis of Non-Linear Wireless Communications in Ultra Dense Networks.
ICC Workshops
Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu
2018 B conf
Rate-optimal communication under nonlinear Gaussian noise via constellation shaping.
WCNC
Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu
2018 — conf
Two-Way Full-Duplex MIMO with Hybrid TX-RX MSE Minimization and Interference Cancellation.
SPAWC
Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu
2017 — conf
Constellation shaping for rate maximization in AWGN channels with non-linear distortion.
CAMSAP
Hiroki Iimori, Razvan-Andrei Stoica, Giuseppe Thadeu Freitas de Abreu