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2020 – today
- 2024
[j22]Sota Uchimura
, Koji Ishibashi, Hiroki Iimori, Paulo Valente Klaine, Szabolcs Malomsoky:
Efficient Channel Tracking Based on Compressive Sensing for OFDM Millimeter-Wave Systems. IEEE Trans. Veh. Technol. 73(8): 11411-11426 (2024)- [j21]Naoki Endo, Hiroki Iimori, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa:
Boosting Spectral Efficiency With Data-Carrying Reference Signals on the Grassmann Manifold. IEEE Trans. Wirel. Commun. 23(8): 10137-10149 (2024) - [j20]Takumi Takahashi, Hiroki Iimori, Koji Ishibashi, Shinsuke Ibi, Giuseppe Thadeu Freitas de Abreu:
Bayesian Bilinear Inference for Joint Channel Tracking and Data Detection in Millimeter-Wave MIMO Systems. IEEE Trans. Wirel. Commun. 23(9): 11136-11153 (2024) - [c30]Kabuto Arai, Koji Ishibashi, Hiroki Iimori, Paulo Valente Klaine, Szabolcs Malomsoky:
Near-Field Channel Estimation for Uplink Multiuser XL-MIMO Systems. SPAWC 2024: 256-260 - [c29]Ryusei Baba, Hiroki Iimori, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa:
Deep Neural Network Based Reduced-Complexity Detector for Grassmann Constellation. VTC Fall 2024: 1-5 - [c28]Taiki Kato, Hiroki Iimori, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa:
Performance Analysis of Data-Carrying Reference Signal in Time-Varying Channels. VTC Spring 2024: 1-5 - [i5]Naoki Endo, Hiroki Iimori, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa:
Boosting Spectral Efficiency with Data-Carrying Reference Signals on the Grassmann Manifold. CoRR abs/2401.02597 (2024) - 2023
- [j19]Sota Uchimura, Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi:
Outage-Minimization Coordinated Multi-Point for Millimeter-Wave OFDM With Random Blockages. IEEE Trans. Veh. Technol. 72(7): 8783-8796 (2023) - [j18]Takumi Takahashi, Hiroki Iimori, Kengo Ando, Koji Ishibashi, Shinsuke Ibi, Giuseppe Thadeu Freitas de Abreu:
Bayesian Receiver Design via Bilinear Inference for Cell-Free Massive MIMO With Low-Resolution ADCs. IEEE Trans. Wirel. Commun. 22(7): 4756-4772 (2023) - [c27]Hiroki Iimori, Jörg Huschke, Joao Vieira:
Radio Unit Configuration for Dynamic Time Division Duplex in Distributed MIMO Systems. GLOBECOM 2023: 2542-2547 - [c26]Hiroki Iimori, Eito Kurihara, Takumi Yoshida, Joao Vieira, Szabolcs Malomsoky:
Amplification Strategy in Repeater-Assisted MIMO Systems via Minorization Maximization. GLOBECOM 2023: 4989-4994 - [c25]Yuya Nishi, Takumi Takahashi, Hiroki Iimori, Giuseppe Abreu, Shinsuke Ibi, Seiichi Sampei:
Wireless Location Tracking via Complex-Domain Super MDS with Time Series Self-Localization Information. ICASSP 2023: 1-5 - [c24]Yuta Kanazawa, Hiroki Iimori, Chandan Pradhan, Szabolcs Malomsoky, Naoki Ishikawa:
Multiple Superimposed Pilots for Accurate Channel Estimation in Orthogonal Time Frequency Space Modulation. VTC Fall 2023: 1-5 - 2022
- [j17]Shuto Fukue, Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi:
Joint Access Configuration and Beamforming for Cell-Free Massive MIMO Systems With Dynamic TDD. IEEE Access 10: 40130-40149 (2022) - [j16]Kengo Ando, Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi:
User-Heterogeneous Cell-Free Massive MIMO Downlink and Uplink Beamforming via Tensor Decomposition. IEEE Open J. Commun. Soc. 3: 740-758 (2022) - [j15]Hiroki Iimori, Takumi Takahashi, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu, David González G., Osvaldo Gonsa:
Joint Activity and Channel Estimation for Extra-Large MIMO Systems. IEEE Trans. Wirel. Commun. 21(9): 7253-7270 (2022) - [j14]Omid Taghizadeh, Tianyu Yang, Hiroki Iimori, Giuseppe Abreu, Ali Cagatay Cirik, Rudolf Mathar:
Quantization-Aided Secrecy: FD C-RAN Communications With Untrusted Radios. IEEE Trans. Wirel. Commun. 21(10): 8522-8535 (2022) - [j13]Hyeon Seok Rou, Giuseppe Thadeu Freitas de Abreu, Hiroki Iimori, David González G., Osvaldo Gonsa:
Scalable Quadrature Spatial Modulation. IEEE Trans. Wirel. Commun. 21(11): 9293-9311 (2022) - [c23]Kengo Ando, Hiroki Iimori, Hyeon Seok Rou, Giuseppe Thadeu Freitas de Abreu, David González González, Osvaldo Gonsa:
An Iterative Discrete Least Square Estimator with Dynamic Parameterization via Deep-Unfolding. IEEECONF 2022: 32-36 - [c22]Seiya Otsuka, Hiroki Iimori, Kengo Ando, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi, Naoki Ishikawa:
Analysis of Secret Key Agreement Protocol for Massive MIMO Systems. CISIS-ICEUTE 2022: 86-94 - [c21]Hiroki Iimori, Takumi Takahashi, Hyeon Seok Rou, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu, David González G., Osvaldo Gonsa:
Grant-Free Access for Extra-Large MIMO Systems Subject to Spatial Non-Stationarity. ICC 2022: 1758-1762 - [c20]Takanori Hara, Hiroki Iimori, Koji Ishibashi:
Grant-Free NOMA Using Time-Delay Domain for Low-Latency Massive Access over MIMO-OFDM. ICC 2022: 3526-3531 - 2021
- [j12]Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Omid Taghizadeh, Razvan-Andrei Stoica, Takanori Hara, Koji Ishibashi:
A Stochastic Gradient Descent Approach for Hybrid mmWave Beamforming With Blockage and CSI-Error Robustness. IEEE Access 9: 74471-74487 (2021) - [j11]Kengo Ando, Hiroki Iimori, Takumi Takahashi, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu:
Uplink Signal Detection for Scalable Cell-Free Massive MIMO Systems With Robustness to Rate-Limited Fronthaul. IEEE Access 9: 102770-102782 (2021) - [j10]Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Takanori Hara, Koji Ishibashi, Razvan-Andrei Stoica, David González G., Osvaldo Gonsa:
Robust Symbol Detection in Large-Scale Overloaded NOMA Systems. IEEE Open J. Commun. Soc. 2: 512-533 (2021) - [j9]Omid Taghizadeh, Slawomir Stanczak, Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu:
Full-Duplex Amplify-and-Forward MIMO Relaying: Design and Performance Analysis Under Erroneous CSI and Hardware Impairments. IEEE Open J. Commun. Soc. 2: 1249-1266 (2021) - [j8]Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, David González G., Osvaldo Gonsa:
Mitigating Channel Aging and Phase Noise in Millimeter Wave MIMO Systems. IEEE Trans. Veh. Technol. 70(7): 7237-7242 (2021) - [j7]Hiroki Iimori, Takumi Takahashi, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu, Wei Yu:
Grant-Free Access via Bilinear Inference for Cell-Free MIMO With Low-Coherence Pilots. IEEE Trans. Wirel. Commun. 20(11): 7694-7710 (2021) - [j6]Takanori Hara, Hiroki Iimori, Koji Ishibashi:
Hyperparameter-Free Receiver for Grant-Free NOMA Systems With MIMO-OFDM. IEEE Wirel. Commun. Lett. 10(4): 810-814 (2021) - [j5]Andre Saito Guerreiro, Hiroki Iimori, Koji Ishibashi:
Low Latency Beam-Sweeping for Millimeter Wave Systems via Pessimistic Optimization. IEEE Wirel. Commun. Lett. 10(12): 2742-2746 (2021) - [i4]Omid Taghizadeh, Tianyu Yang, Hiroki Iimori, Giuseppe Abreu, Ali Cagatay Cirik, Rudolf Mathar:
Quantization-Aided Secrecy: FD C-RAN Communications with Untrusted Radios. CoRR abs/2107.08495 (2021) - 2020
- [j4]Naoya Hirosawa, Hiroki Iimori, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu:
Minimizing Age of Information in Energy Harvesting Wireless Sensor Networks. IEEE Access 8: 219934-219945 (2020) - [j3]Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Omid Taghizadeh, Razvan-Andrei Stoica, Takanori Hara, Koji Ishibashi:
Stochastic Learning Robust Beamforming for Millimeter-Wave Systems With Path Blockage. IEEE Wirel. Commun. Lett. 9(9): 1557-1561 (2020) - [c19]Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Omid Taghizadeh, Koji Ishibashi:
Discrete-Aware Matrix Completion via Proximal Gradient. ACSSC 2020: 1327-1332 - [c18]Ryo Okabe, Hiroki Iimori, Koji Ishibashi:
Low-Complexity Robust Beamforming with Blockage Prediction for Millimeter-Wave Communications. APSIPA 2020: 1453-1459 - [c17]Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi:
Full-Duplex MIMO Systems with Hardware Limitations and Imperfect Channel Estimation. GLOBECOM 2020: 1-6 - [c16]Omid Taghizadeh, Slawomir Stanczak, Hiroki Iimori, Giuseppe Abreu:
Full-Duplex AF MIMO Relaying: Impairments Aware Design and Performance Analysis. GLOBECOM 2020: 1-6 - [c15]Takanori Hara, Hiroki Iimori, Koji Ishibashi:
Activity Detection for Uplink Grant-Free NOMA in the Presence of Carrier Frequency Offsets. ICC Workshops 2020: 1-6 - [c14]Hiroki Iimori, Razvan-Andrei Stoica, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu:
Robust Sparse Reconstruction of mmWave Channel Estimates via Fractional Programming. ICOIN 2020: 318-323 - [i3]Hiroki Iimori, Razvan-Andrei Stoica, Giuseppe Thadeu Freitas de Abreu, G. David Gonzalez, Andreas Andrae, Osvaldo Gonsa:
Discreteness-aware Receivers for Overloaded MIMO Systems. CoRR abs/2001.07560 (2020) - [i2]Omid Taghizadeh, Slawomir Stanczak, Hiroki Iimori, Giuseppe Abreu:
Full-Duplex Amplify-and-Forward MIMO Relaying: Impairments Aware Design and Performance Analysis. CoRR abs/2008.06063 (2020)
2010 – 2019
- 2019
- [j2]Razvan-Andrei Stoica, Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi:
Frame Theory and Fractional Programming for Sparse Recovery-Based mmWave Channel Estimation. IEEE Access 7: 150757-150774 (2019) - [j1]Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, George C. Alexandropoulos:
MIMO Beamforming Schemes for Hybrid SIC FD Radios With Imperfect Hardware and CSI. IEEE Trans. Wirel. Commun. 18(10): 4816-4830 (2019) - [c13]Razvan-Andrei Stoica, Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu:
Sparsely-structured Multiuser Detection for Large Massively Concurrent NOMA Systems. ACSSC 2019: 1821-1826 - [c12]Hiroki Iimori, Giuseppe Abreu, David González G., Osvaldo Gonsa:
Joint Detection in Massive Overloaded Wireless Systems via Mixed-Norm Discrete Vector Decoding. ACSSC 2019: 2058-2062 - [c11]Naoya Hirosawa, Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi:
Age-of-Information Minimization in Two-User Multiple Access Channel with Energy Harvesting. CAMSAP 2019: 361-365 - [c10]Razvan-Andrei Stoica, Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu:
Multiuser Detection for Large Massively Concurrent NOMA Systems via Fractional Programming. CAMSAP 2019: 599-603 - [c9]Hiroki Iimori, Giuseppe Abreu, Koji Ishibashi, George C. Alexandropoulos:
Transmission Strategies in Imperfect Bi-directional Full-Duplex MIMO Systems. WCNC 2019: 1-6 - [c8]Hiroki Iimori, Giuseppe Abreu, Koji Ishibashi:
Fractional Programming for Robust TX BF Design in Multi-User/Single-Carrier PD-NOMA. WiOpt 2019: 1-7 - 2018
- [c7]Hiroki Iimori, Giuseppe Abreu, George C. Alexandropoulos:
Full-Duplex Transmission Optimization for Bi-directional MIMO links with QoS Guarantees. GlobalSIP 2018: 201-205 - [c6]Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu:
Performance Analysis of Non-Linear Wireless Communications in Ultra Dense Networks. ICC Workshops 2018: 1-6 - [c5]Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu:
Two-Way Full-Duplex MIMO with Hybrid TX-RX MSE Minimization and Interference Cancellation. SPAWC 2018: 1-5 - [c4]Razvan-Andrei Stoica, Giuseppe Thadeu Freitas de Abreu, Hiroki Iimori:
A Frame-Theoretic Scheme for Robust Millimeter Wave Channel Estimation. VTC Fall 2018: 1-6 - [c3]Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu:
Rate-optimal communication under nonlinear Gaussian noise via constellation shaping. WCNC 2018: 1-5 - [c2]Hiroki Iimori, Giuseppe Abreu, George C. Alexandropoulos:
Full-Duplex Bi-directional MIMO under Imperfect CSI and Hardware Impairments. WPNC 2018: 1-6 - [i1]Hiroki Iimori, Giuseppe Abreu, George C. Alexandropoulos:
Full-Duplex Transmission Optimization for Bi-directional MIMO links with QoS Guarantees. CoRR abs/1809.08788 (2018) - 2017
- [c1]Hiroki Iimori, Razvan-Andrei Stoica, Giuseppe Thadeu Freitas de Abreu:
Constellation shaping for rate maximization in AWGN channels with non-linear distortion. CAMSAP 2017: 1-5
Coauthor Index
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