Constellation shaping for rate maximization in AWGN channels with non-linear distortion. - Hiroki Iimori; Razvan-Andrei Stoica; Giuseppe Thadeu Freitas de Abreu (CAMSAP, 2017)

Full-Duplex Transmission Optimization for Bi-directional MIMO links with QoS Guarantees. - Hiroki Iimori; Giuseppe Abreu; George C. Alexandropoulos (GlobalSIP, 2018)

Performance Analysis of Non-Linear Wireless Communications in Ultra Dense Networks. - Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu (ICC Workshops, 2018)

Two-Way Full-Duplex MIMO with Hybrid TX-RX MSE Minimization and Interference Cancellation. - Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu (SPAWC, 2018)

A Frame-Theoretic Scheme for Robust Millimeter Wave Channel Estimation. - Razvan-Andrei Stoica; Giuseppe Thadeu Freitas de Abreu; Hiroki Iimori (VTC Fall, 2018)

Rate-optimal communication under nonlinear Gaussian noise via constellation shaping. - Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu (WCNC, 2018)

Full-Duplex Bi-directional MIMO under Imperfect CSI and Hardware Impairments. - Hiroki Iimori; Giuseppe Abreu; George C. Alexandropoulos (WPNC, 2018)

Joint Detection in Massive Overloaded Wireless Systems via Mixed-Norm Discrete Vector Decoding. - Hiroki Iimori; Giuseppe Abreu; David González G.; Osvaldo Gonsa (ACSSC, 2019)

Sparsely-structured Multiuser Detection for Large Massively Concurrent NOMA Systems. - Razvan-Andrei Stoica; Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu (ACSSC, 2019)

Age-of-Information Minimization in Two-User Multiple Access Channel with Energy Harvesting. - Naoya Hirosawa; Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu; Koji Ishibashi (CAMSAP, 2019)

Multiuser Detection for Large Massively Concurrent NOMA Systems via Fractional Programming. - Razvan-Andrei Stoica; Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu (CAMSAP, 2019)

Transmission Strategies in Imperfect Bi-directional Full-Duplex MIMO Systems. - Hiroki Iimori; Giuseppe Abreu; Koji Ishibashi; George C. Alexandropoulos (WCNC, 2019)

Fractional Programming for Robust TX BF Design in Multi-User/Single-Carrier PD-NOMA. - Hiroki Iimori; Giuseppe Abreu; Koji Ishibashi (WiOpt, 2019)

Frame Theory and Fractional Programming for Sparse Recovery-Based mmWave Channel Estimation. - Razvan-Andrei Stoica; Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu; Koji Ishibashi (IEEE Access, 2019)

MIMO Beamforming Schemes for Hybrid SIC FD Radios With Imperfect Hardware and CSI. - Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu; George C. Alexandropoulos (IEEE Trans. Wirel. Commun., 2019)

Discrete-Aware Matrix Completion via Proximal Gradient. - Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu; Omid Taghizadeh; Koji Ishibashi (ACSSC, 2020)

Low-Complexity Robust Beamforming with Blockage Prediction for Millimeter-Wave Communications. - Ryo Okabe; Hiroki Iimori; Koji Ishibashi (APSIPA, 2020)

Full-Duplex MIMO Systems with Hardware Limitations and Imperfect Channel Estimation. - Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu; Koji Ishibashi (GLOBECOM, 2020)

Full-Duplex AF MIMO Relaying: Impairments Aware Design and Performance Analysis. - Omid Taghizadeh; Slawomir Stanczak; Hiroki Iimori; Giuseppe Abreu (GLOBECOM, 2020)

Activity Detection for Uplink Grant-Free NOMA in the Presence of Carrier Frequency Offsets. - Takanori Hara; Hiroki Iimori; Koji Ishibashi (ICC Workshops, 2020)

Robust Sparse Reconstruction of mmWave Channel Estimates via Fractional Programming. - Hiroki Iimori; Razvan-Andrei Stoica; Koji Ishibashi; Giuseppe Thadeu Freitas de Abreu (ICOIN, 2020)

Minimizing Age of Information in Energy Harvesting Wireless Sensor Networks. - Naoya Hirosawa; Hiroki Iimori; Koji Ishibashi; Giuseppe Thadeu Freitas de Abreu (IEEE Access, 2020)

Discreteness-aware Receivers for Overloaded MIMO Systems. - Hiroki Iimori; Razvan-Andrei Stoica; Giuseppe Thadeu Freitas de Abreu; G. David Gonzalez; Andreas Andrae; Osvaldo Gonsa (CoRR, 2020)

Full-Duplex Amplify-and-Forward MIMO Relaying: Impairments Aware Design and Performance Analysis. - Omid Taghizadeh; Slawomir Stanczak; Hiroki Iimori; Giuseppe Abreu (CoRR, 2020)

Stochastic Learning Robust Beamforming for Millimeter-Wave Systems With Path Blockage. - Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu; Omid Taghizadeh; Razvan-Andrei Stoica; Takanori Hara; Koji Ishibashi (IEEE Wirel. Commun. Lett., 2020)

Uplink Signal Detection for Scalable Cell-Free Massive MIMO Systems With Robustness to Rate-Limited Fronthaul. - Kengo Ando; Hiroki Iimori; Takumi Takahashi; Koji Ishibashi; Giuseppe Thadeu Freitas de Abreu (IEEE Access, 2021)

A Stochastic Gradient Descent Approach for Hybrid mmWave Beamforming With Blockage and CSI-Error Robustness. - Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu; Omid Taghizadeh; Razvan-Andrei Stoica; Takanori Hara; Koji Ishibashi (IEEE Access, 2021)

Robust Symbol Detection in Large-Scale Overloaded NOMA Systems. - Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu; Takanori Hara; Koji Ishibashi; Razvan-Andrei Stoica; David González G.; Osvaldo Gonsa (IEEE Open J. Commun. Soc., 2021)

Full-Duplex Amplify-and-Forward MIMO Relaying: Design and Performance Analysis Under Erroneous CSI and Hardware Impairments. - Omid Taghizadeh; Slawomir Stanczak; Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu (IEEE Open J. Commun. Soc., 2021)

Mitigating Channel Aging and Phase Noise in Millimeter Wave MIMO Systems. - Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu; David González G.; Osvaldo Gonsa (IEEE Trans. Veh. Technol., 2021)

Grant-Free Access via Bilinear Inference for Cell-Free MIMO With Low-Coherence Pilots. - Hiroki Iimori; Takumi Takahashi; Koji Ishibashi; Giuseppe Thadeu Freitas de Abreu; Wei Yu 001 (IEEE Trans. Wirel. Commun., 2021)

Low Latency Beam-Sweeping for Millimeter Wave Systems via Pessimistic Optimization. - Andre Saito Guerreiro; Hiroki Iimori; Koji Ishibashi (IEEE Wirel. Commun. Lett., 2021)

Hyperparameter-Free Receiver for Grant-Free NOMA Systems With MIMO-OFDM. - Takanori Hara; Hiroki Iimori; Koji Ishibashi (IEEE Wirel. Commun. Lett., 2021)

An Iterative Discrete Least Square Estimator with Dynamic Parameterization via Deep-Unfolding. - Kengo Ando; Hiroki Iimori; Hyeon Seok Rou; Giuseppe Thadeu Freitas de Abreu; David González González; Osvaldo Gonsa (IEEECONF, 2022)

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)

Grant-Free NOMA Using Time-Delay Domain for Low-Latency Massive Access over MIMO-OFDM. - Takanori Hara; Hiroki Iimori; Koji Ishibashi (ICC, 2022)

Grant-Free Access for Extra-Large MIMO Systems Subject to Spatial Non-Stationarity. - Hiroki Iimori; Takumi Takahashi; Hyeon Seok Rou; Koji Ishibashi; Giuseppe Thadeu Freitas de Abreu; David González G.; Osvaldo Gonsa (ICC, 2022)

Joint Access Configuration and Beamforming for Cell-Free Massive MIMO Systems With Dynamic TDD. - Shuto Fukue; Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu; Koji Ishibashi (IEEE Access, 2022)

User-Heterogeneous Cell-Free Massive MIMO Downlink and Uplink Beamforming via Tensor Decomposition. - Kengo Ando; Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu; Koji Ishibashi (IEEE Open J. Commun. Soc., 2022)

Joint Activity and Channel Estimation for Extra-Large MIMO Systems. - Hiroki Iimori; Takumi Takahashi; Koji Ishibashi; Giuseppe Thadeu Freitas de Abreu; David González G.; Osvaldo Gonsa (IEEE Trans. Wirel. Commun., 2022)

Scalable Quadrature Spatial Modulation. - Hyeon Seok Rou; Giuseppe Thadeu Freitas de Abreu; Hiroki Iimori; David González G.; Osvaldo Gonsa (IEEE Trans. Wirel. Commun., 2022)

Quantization-Aided Secrecy: FD C-RAN Communications With Untrusted Radios. - Omid Taghizadeh; Tianyu Yang 002; Hiroki Iimori; Giuseppe Abreu; Ali Cagatay Cirik; Rudolf Mathar (IEEE Trans. Wirel. Commun., 2022)

Radio Unit Configuration for Dynamic Time Division Duplex in Distributed MIMO Systems. - Hiroki Iimori; Jörg Huschke; Joao Vieira (GLOBECOM, 2023)

Amplification Strategy in Repeater-Assisted MIMO Systems via Minorization Maximization. - Hiroki Iimori; Eito Kurihara; Takumi Yoshida; Joao Vieira; Szabolcs Malomsoky (GLOBECOM, 2023)

Wireless Location Tracking via Complex-Domain Super MDS with Time Series Self-Localization Information. - Yuya Nishi; Takumi Takahashi; Hiroki Iimori; Giuseppe Abreu; Shinsuke Ibi; Seiichi Sampei (ICASSP, 2023)

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)

Outage-Minimization Coordinated Multi-Point for Millimeter-Wave OFDM With Random Blockages. - Sota Uchimura; Hiroki Iimori; Giuseppe Thadeu Freitas de Abreu; Koji Ishibashi (IEEE Trans. Veh. Technol., 2023)

Bayesian Receiver Design via Bilinear Inference for Cell-Free Massive MIMO With Low-Resolution ADCs. - Takumi Takahashi; Hiroki Iimori; Kengo Ando; Koji Ishibashi; Shinsuke Ibi; Giuseppe Thadeu Freitas de Abreu (IEEE Trans. Wirel. Commun., 2023)

Near-Field Channel Estimation for Uplink Multiuser XL-MIMO Systems. - Kabuto Arai; Koji Ishibashi; Hiroki Iimori; Paulo Valente Klaine; Szabolcs Malomsoky (SPAWC, 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)

Efficient Channel Tracking Based on Compressive Sensing for OFDM Millimeter-Wave Systems. - Sota Uchimura; Koji Ishibashi; Hiroki Iimori; Paulo Valente Klaine; Szabolcs Malomsoky (IEEE Trans. Veh. Technol., 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)

Bayesian Bilinear Inference for Joint Channel Tracking and Data Detection in Millimeter-Wave MIMO Systems. - Takumi Takahashi; Hiroki Iimori; Koji Ishibashi; Shinsuke Ibi; Giuseppe Thadeu Freitas de Abreu (IEEE Trans. Wirel. Commun., 2024)

Efficient Joint Transmit and Receive Beam Alignment via Sequential CNN LSTM Networks. - Takumi Yoshida; Koji Ishibashi; Hiroki Iimori; Paulo Valente Klaine; Szabolcs Malomsoky (IEEE Access, 2025)

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)

Achieving Distributed MIMO Performance with Repeater-Assisted Cellular Massive MIMO. - Sara Willhammar; Hiroki Iimori; Joao Vieira; Lars Sundström; Fredrik Tufvesson; Erik G. Larsson (IEEE Commun. Mag., 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)