On the performance of bit-interleaved coded DAPSK over Rayleigh fading channels. - Koji Ishibashi; Hideki Ochiai; Ryuji Kohno (ICC, 2004)

Low-complexity bit-interleaved coded DAPSK for Rayleigh-fading channels. - Koji Ishibashi; Hideki Ochiai; Ryuji Kohno (IEEE J. Sel. Areas Commun., 2005)

On the Performance of LDPC Codes with Differential Detection over Rayleigh Fading Channels. - Hiroshi Tatsunami; Koji Ishibashi; Hideki Ochiai (VTC Spring, 2006)

Embedded Forward Error Control Technique (EFECT) for Low-Rate Real-Time Communications. - Koji Ishibashi; Hideki Ochiai; Ryuji Kohno (GLOBECOM, 2007)

Tomlinson-Harashima Precoded MIMO System with Differential Detection. - Saori Fukushi; Koji Ishibashi; Ryuji Kohno (PIMRC, 2007)

Low Complexity Bit-Interleaved Coded DAPSK with Cyclic Delay Diversity. - Koji Ishibashi; Hideki Ochiai; Ryuji Kohno (PIMRC, 2007)

Performance of Cognitive Radio Technologies in the Presence of Primary Radio Systems. - Kotaro Watanabe; Koji Ishibashi; Ryuji Kohno (PIMRC, 2007)

A Scalable Model of Shielded Capacitors Using Mirror Image Effects. - Koji Ishibashi; Ivan Chee Hong Lai; Kyoya Takano; Minoru Fujishima (IEICE Trans. Electron., 2007)

Diversity Order Analysis of Bit-Interleaved Coded DPSK with Cyclic Delay Diversity. - Koji Ishibashi; Koji Ishii; Hideki Ochiai (GLOBECOM, 2008)

Dirty Paper Coded Cooperation Utilizing Superposition Modulation. - Koji Ishii; Koji Ishibashi (IEICE Trans. Commun., 2008)

Embedded forward error control technique (EFECT) for low-rate but low latency communications. - Koji Ishibashi; Hideki Ochiai; Ryuji Kohno (IEEE Trans. Wirel. Commun., 2008)

A Proposal of New Hybrid ARQ Scheme Suitable for Multi-Hop Transmissions Using LDPC Codes. - Takayuki Hashimoto; Tetsuya Wakiyama; Koji Ishibashi; Tadahiro Wada (GLOBECOM, 2009)

A Novel Cooperative Diversity Based on Multilevel Coded Modulation. - Koji Ishii; Koji Ishibashi; Hideki Ochiai (ICC, 2009)

A throughput performance analysis of hybrid ARQ scheme for wireless multihop networks using LDPC codes. - Tadahiro Wada; Tetsuya Wakiyama; Takayuki Hashimoto; Koji Ishibashi (ICOIN, 2009)

A Proposal of New Hybrid ARQ Scheme using Rate Compatible LDPC Codes for Multi-hop Transmissions. - Takayuki Hashimoto; Tetsuya Wakiyama; Koji Ishibashi; Tadahiro Wada (VTC Fall, 2009)

Design of Adaptive Coded Cooperation using Rate Compatible Turbo Codes. - Koji Ishibashi; Koji Ishii; Hideki Ochiai (VTC Fall, 2009)

Bit-interleaved coded DPSK with cyclic delay diversity: design and analysis. - Koji Ishibashi; Koji Ishii; Hideki Ochiai (IEEE Trans. Wirel. Commun., 2009)

Dynamic Turbo Coded Cooperation with Simple Power Detection. - Koji Ishibashi; Koji Ishii; Hideki Ochiai (ICC, 2010)

Performance evaluation of Go-Back-i-symbol ARQ scheme applicable to meteor burst communications. - Shinsuke Nagata; Kaiji Mukumoto; Tadahiro Wada; Koji Ishibashi (ISITA, 2010)

An Analysis of Interference Mitigation Capability of Low Duty-Cycle UWB Communications in the Presence of Wideband OFDM System. - Keisuke Sodeyama; Koji Ishibashi; Ryuji Kohno (Wirel. Pers. Commun., 2010)

The gaussian two-way relay channel with wiretapper. - Sungsoo Kim; Won-Yong Shin; Koji Ishibashi (ACSCC, 2011)

A peak power efficient cooperative diversity using star-QAM. - Koji Ishibashi; Won-Yong Shin; Hyoseok Yi; Hideki Ochiai (GLOBECOM Workshops, 2011)

Performance Analysis of Amplify and Forward Cooperation over Peak-Power Limited Channels. - Koji Ishibashi; Hideki Ochiai (ICC, 2011)

A study on outage probability of collaborative multi-hop transmissions with non-uniformly distributed networks. - Toshiki Kobayashi; Koji Ishibashi; Tadahiro Wada (PIMRC, 2011)

Regional Diversity-Multiplexing Tradeoff. - Won-Yong Shin; Koji Ishibashi (IEICE Trans. Commun., 2011)

Dynamic Coded Cooperation Using Multiple Turbo Codes in Wireless Relay Networks. - Koji Ishibashi; Koji Ishii; Hideki Ochiai (IEEE J. Sel. Top. Signal Process., 2011)

Multilevel Coded Cooperation for Multiple Sources. - Koji Ishii; Koji Ishibashi; Hideki Ochiai (IEEE Trans. Wirel. Commun., 2011)

Energy harvesting cooperative communications. - Koji Ishibashi; Hideki Ochiai; Vahid Tarokh (PIMRC, 2012)

Throughput Scaling of Ultra-Wide Band Ad Hoc Networks with Infrastructure. - Won-Yong Shin; Koji Ishibashi (IEICE Trans. Commun., 2012)

Effect of Multiple Antennas on the Transport Capacity in Large-Scale Ad Hoc Networks. - Won-Yong Shin; Koji Ishibashi (IEICE Trans. Commun., 2012)

Proposal of Go-Back-i-symbol ARQ Scheme and its Performance Evaluation in Meteor Burst Communications. - Kaiji Mukumoto; Shinsuke Nagata; Tadahiro Wada; Koji Ishibashi (IEEE Trans. Commun., 2012)

Analysis of Instantaneous Power Distributions for Non-Regenerative and Regenerative Relaying Signals. - Koji Ishibashi; Hideki Ochiai (IEEE Trans. Wirel. Commun., 2012)

Semi-blind interference alignment based on OFDM over frequency selective X channels. - Manato Takai; Koji Ishibashi; Won-Yong Shin; Hyoseok Yi; Tadahiro Wada (ICC, 2013)

Superimposed adaptive network coded cooperation for wireless sensor networks. - Naoki Takeishi; Koji Ishibashi; Yasushi Yamao (PIMRC, 2013)

Nested Transmit Diversity Based on a Joint Network-Channel Coding. - Koji Ishii; Koji Ishibashi (IEICE Trans. Commun., 2013)

Hierarchical Cooperation in Ultra-Wide Band Ad Hoc Networks. - Won-Yong Shin; Koji Ishibashi (IEICE Trans. Commun., 2013)

A Peak Power Efficient Cooperative Diversity using Star-QAM with Coherent/Noncoherent Detection. - Koji Ishibashi; Won-Yong Shin; Hideki Ochiai; Vahid Tarokh (IEEE Trans. Wirel. Commun., 2013)

Multi-hop transmission performance of integrated dynamic multi-hopping for wireless ad hoc networks. - Yuki Matsuzawa; Yasushi Yamao; Kenta Otake; Koji Ishibashi (CCNC, 2014)

Analysis of RF energy harvesting in large-scale networks using absorption function. - Koji Ishibashi; Giuseppe Abreu (ICASSP, 2014)

RF energy powered feedback-aided cooperation. - Hiroki Kawabata; Koji Ishibashi (PIMRC, 2014)

Semi-blind interference alignment over correlated wireless channels. - Manato Takai; Koji Ishibashi; Tadahiro Wada (RWS, 2014)

Dynamic harvest-and-forward: New cooperative diversity with RF energy harvesting. - Koji Ishibashi (WCSP, 2014)

Serially-concatenated layered network coded cooperation for wireless sensor networks. - Huifa Lin; Koji Ishibashi; Takeo Fujii (WPMC, 2014)

Wideband Digital Predistortion Using Spectral Extrapolation of Band-Limited Feedback Signal. - Yuelin Ma; Yasushi Yamao; Yoshihiko Akaiwa; Koji Ishibashi (IEEE Trans. Circuits Syst. I Regul. Pap., 2014)

Effects of Antenna Switching on Band-Limited Spatial Modulation. - Koji Ishibashi; Shinya Sugiura (IEEE Wirel. Commun. Lett., 2014)

Frameless ALOHA with multiple base stations. - Shun Ogata; Koji Ishibashi (ACSSC, 2015)

Spatially coupled repeat-accumulate coded cooperation. - Naoki Takeishi; Koji Ishibashi (WCNC, 2015)

Low-power V2M communication system with fast network association capability. - Keisuke Hirose; Koji Ishibashi; Yasushi Yamao; Yasuhiro Hirayama; Manabu Sawada (WF-IoT, 2015)

A Simple Random Access Scheme With Multilevel Power Allocation. - Huifa Lin; Koji Ishibashi; Won-Yong Shin; Takeo Fujii (IEEE Commun. Lett., 2015)

Decentralized Multilevel Power Allocation for Random Access. - Huifa Lin; Koji Ishibashi; Won-Yong Shin; Takeo Fujii (IEICE Trans. Commun., 2015)

Highly Efficient Multi-Hop Packet Transmission Using Intra-Flow Interference Cancellation and Maximal-Ratio Combining. - Jingze Dai; Koji Ishibashi; Yasushi Yamao (IEEE Trans. Wirel. Commun., 2015)

Diversity-Multiplexing Tradeoff of Dynamic Harvest-and-Forward Cooperation. - Koji Ishibashi; Chin Keong Ho; Ioannis Krikidis (IEEE Wirel. Commun. Lett., 2015)

Energy-efficient random sleep protocol based on distributed coding for sensor-to-vehicle communications. - Yuki Goto; Shun Ogata; Koji Ishibashi (ACSSC, 2016)

Decentralized power allocation for secondary random access in cognitive radio networks with successive interference cancellation. - Huifa Lin; Koji Ishibashi; Won-Yong Shin; Takeo Fujii (ICC, 2016)

QR-decomposed generalized belief propagation for MIMO detection. - Akihide David Shigyo; Shogo Tanabe; Koji Ishibashi (ISITA, 2016)

Not-so-large MIMO signal detection based on damped QR-decomposed belief propagation. - Shogo Tanabe; Akihide David Shigyo; Koji Ishibashi (ISITA, 2016)

QR-decomposed generalized belief propagation with smart message reduction for low-complexity MIMO signal detection. - Akihide David Shigyo; Koji Ishibashi (APSIPA, 2017)

Multi-access diversity gain via multiple base station cooperation in frameless ALOHA. - Shun Ogata; Koji Ishibashi; Giuseppe Abreu (SPAWC, 2017)

Robust Coded Cooperation Based on Multi-Dimensional Spatially-Coupled Repeat-Accumulate Codes. - Ryosuke Tanaka; Koji Ishibashi (WCNC, 2017)

Robust Relay Selection for Large-Scale Energy-Harvesting IoT Networks. - Hiroki Kawabata; Koji Ishibashi; Satyanarayana Vuppala; Giuseppe Thadeu Freitas de Abreu (IEEE Internet Things J., 2017)

Wireless Power Transfer for Distributed Estimation in Sensor Networks. - Vien V. Mai; Won-Yong Shin; Koji Ishibashi (IEEE J. Sel. Top. Signal Process., 2017)

ZigZag Decodable Frameless ALOHA. - Shun Ogata; Koji Ishibashi (ACSSC, 2018)

A Simple Message Passing Detector Based on QR-Decomposition for MIMO Systems. - Akihide David Shigyo; Koji Ishibashi (APSIPA, 2018)

Practical green information delivery protocol for sensor-to-vehicle communications. - Yuki Goto; Koji Ishibashi (CCNC, 2018)

Implementation of condition-aware receiver-initiated MAC protocol to realize energy-harvesting wireless sensor networks. - Tatsuhiro Kawaguchi; Ryo Tanabe; Ryohei Takitouge; Koichiro Ishibashi; Koji Ishibashi (CCNC, 2018)

Energy-aware receiver-driven medium access control protocol for wireless energy-harvesting sensor networks. - Ryo Tanabe; Tatsuhiro Kawaguchi; Ryohei Takitoge; Koichiro Ishibashi; Koji Ishibashi (CCNC, 2018)

Low-Complexity Generator Polynomial Search for Turbo Trellis-Coded Spatial Modulation Using Symbol-based EXIT Charts. - Takanori Hara; Koji Ishibashi; Soon Xin Ng; Lajos Hanzo (ISTC, 2018)

Coded Frameless ALOHA. - Shun Ogata; Koji Ishibashi (WPNC, 2018)

Aggregate-Compression-Aided Subcarrier IQ Index Modulation. - Kazuya Ohira; Takanori Hara; Koji Ishibashi (WPNC, 2018)

ZigZag Decodable Coded Slotted ALOHA. - Masaru Oinaga; Shun Ogata; Koji Ishibashi (WPNC, 2018)

Optimized Frameless ALOHA for Cooperative Base Stations With Overlapped Coverage Areas. - Shun Ogata; Koji Ishibashi; Giuseppe Thadeu Freitas de Abreu (IEEE Trans. Wirel. Commun., 2018)

Low Complexity Uplink Grant-Free NOMA Based on Boosted Approximate Message Passing. - Takanori Hara; Koji Ishibashi (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)

Ambient OFDM Pilot-Aided Delay-Shift Keying and Its Efficient Detection for Ultra Low-Power Communications. - Ryuhei Takahashi; Koji Ishibashi (GlobalSIP, 2019)

Spatially Coupled Repeat-Accumulate Signal Codes. - Manato Takai; Koji Ishibashi (RWS, 2019)

On the Sum-Rate Capacity and Spectral Efficiency Gains of Massively Concurrent NOMA Systems. - Takanori Hara; Razvan-Andrei Stoica; Koji Ishibashi; Giuseppe Thadeu Freitas de Abreu (WCNC, 2019)

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

Design of Communication Systems for Wireless-Powered Communications with Multiple Frequency Bands. - Ryuhei Takahashi; Koji Ishibashi (WCNC, 2019)

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

Grant-Free Non-Orthogonal Multiple Access With Multiple-Antenna Base Station and Its Efficient Receiver Design. - Takanori Hara; Koji Ishibashi (IEEE Access, 2019)

Application of ZigZag Decoding in Frameless ALOHA. - Shun Ogata; Koji Ishibashi (IEEE Access, 2019)

Design of Coded ALOHA With ZigZag Decoder. - Masaru Oinaga; Shun Ogata; Koji Ishibashi (IEEE Access, 2019)

Time-to-Recharge Analysis for Energy-Relay-Assisted Energy Harvesting. - Siddhartha Sarma; Koji Ishibashi (IEEE Access, 2019)

Massively Concurrent Non-Orthogonal Multiple Access for 5G Networks and Beyond. - Razvan-Andrei Stoica; Giuseppe Thadeu Freitas de Abreu; Takanori Hara; Koji Ishibashi (IEEE Access, 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)

Analog-to-Digital Conversion With Reconfigurable Function Mapping for Neural Networks Activation Function Acceleration. - Massimo Giordano; Giorgio Cristiano; Koji Ishibashi; Stefano Ambrogio; Hsinyu Tsai; Geoffrey W. Burr; Pritish Narayanan (IEEE J. Emerg. Sel. Topics Circuits Syst., 2019)

Repeat-Accumulate Signal Codes. - Manato Takai; Koji Ishibashi (IEEE Trans. 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)

Packet Aggregation Based on Encryption-Then-Compression for Highly Efficient Multi-Hop Transmission. - Ryota Yatsu; Takanori Hara; Koji Ishibashi; Sota Tsuchiya; Hideki Endo (APSIPA, 2020)

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

Grant-Free NOMA Using Approximate Message Passing with Multi-Measurement Vector. - Takanori Hara; Koji Ishibashi (ICOIN, 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)

Received-Power-Aware Frameless ALOHA for Grant-Free Non-Orthogonal Multiple Access. - Masaru Oinaga; Shun Ogata; Koji Ishibashi (ICOIN, 2020)

Research Project to Realize Various High-reliability Communications in Advanced 5G Network. - Takahide Murakami; Yoji Kishi; Koji Ishibashi; Keisuke Kasai; Hiroyuki Shinbo; Morihiko Tamai; Kensuke Tsuda; Masataka Nakazawa; Yu Tsukamoto; Hiroyuki Yokoyama; Yoshimi Fujii; Yuta Seki; et al. (WCNC, 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)

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)

Ambient OFDM Pilot-Aided Backscatter Communications: Concept and Design. - Takanori Hara; Ryuhei Takahashi; Koji Ishibashi (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)

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)

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)

Iterative Activity Detection and Carrier Frequency Offset Estimation for Grant-Free NOMA. - Kohei Ueda; Takanori Hara; Koji Ishibashi (PIMRC, 2022)

Beamforming Design for Wireless Coded Caching with Different Cache Sizes. - Ayaka Urabe; Koji Ishibashi; Mohammad Javad Salehi; Antti Tölli (SPAWC, 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)

Signal Quality Improvement in Downlink Power Domain NOMA with Blind Nonlinear Compensator and Frequency Domain Equalizer. - Jun Nagai; Koji Ishibashi; Yasushi Yamao (IEICE Trans. Commun., 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)

Blind Multiple Measurement Vector AMP Based on Expectation Maximization for Grant-Free NOMA. - Takanori Hara; Koji Ishibashi (IEEE Wirel. Commun. Lett., 2022)

User-Centric Design of Millimeter Wave Communications for Beyond 5G and 6G. - Koji Ishibashi; Takanori Hara; Sota Uchimura; Tetsuya Iye; Yoshimi Fujii; Takahide Murakami; Hiroyuki Shinbo (IEICE Trans. Commun., 2022)

Network-Assisted Full-Duplex Millimeter-Wave Cell-Free Massive MIMO with Localization-Aided Inter-User Channel Estimation. - Shuto Fukue; Giuseppe Thadeu Freitas de Abreu; Koji Ishibashi (ICOIN, 2023)

Self-Calibration for Channel Estimation in Hybrid Millimeter-Wave MIMO Systems. - Kabuto Arai; Koji Ishibashi (VTC Fall, 2023)

Scalable Network-Assisted Full-Duplex Cell-Free Massive MIMO With Limited Fronthaul Capacity. - Koushi Okui; Kengo Ando; Giuseppe Abreu; Koji Ishibashi (VTC Fall, 2023)

Packet Aggregation Utilizing Multi-Antenna Beamforming in IRDT Protocol. - Keigo Saito; Takeo Fujii; Koji Ishibashi; Yu Shibata; Soma Toki; Hideki Endo (VTC Fall, 2023)

Hybrid Beamforming for Outage-Minimization in Frequency Selective Millimeter-Wave Channels. - Sota Uchimura; Giuseppe Thadeu Freitas de Abreu; Koji Ishibashi (WCNC, 2023)

Physical-Layer Authentication Over Spatially Correlated MIMO Channels. - Kenta Miwa; Kengo Ando; Giuseppe Thadeu Freitas de Abreu; Koji Ishibashi (WPMC, 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)

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)

Robust Beamfocusing Against Positioning Errors Over Sub-Terahertz LOS Channels. - Sota Uchimura; Koji Ishibashi; Josep Miquel Jornet (IEEECONF, 2024)

Outage-Minimization Power and Spectrum Allocation for Terahertz Communications Systems. - Sota Uchimura; Koji Ishibashi; Josep Miquel Jornet (IEEECONF, 2024)

Human Blockage Analysis at 5G Millimeter Wave Frequencies Using a High-Resolution Voxel Model. - Kun Li 022; Hongda Xu; Xiaolong Wang 010; Koji Ishibashi (APWCS, 2024)

Interference-Aware Analog Beam Selection for Cell-Free Massive MIMO With Hybrid Beamforming Over Millimeter-Wave Channels. - Shunsuke Kamiwatari; Masaaki Ito; Issei Kanno; Kengo Ando; Koji Ishibashi (CCNC, 2024)

Low-Complexity Cross-Domain Iterative Detection Based on Local LMMSE Filters for OTFS. - Takumi Yoshida; Takumi Takahashi; Koji Ishibashi (ICC Workshops, 2024)

Near-Field Channel Estimation for Uplink Multiuser XL-MIMO Systems. - Kabuto Arai; Koji Ishibashi; Hiroki Iimori; Paulo Valente Klaine; Szabolcs Malomsoky (SPAWC, 2024)

Multi-Hop Communication System with Multi-Antenna Beamforming in IRDT Protocol. - Keigo Saito; Takeo Fujii; Koji Ishibashi; Yu Shibata; Soma Toki; Jumpei Doi; Toru Hatae (VTC Fall, 2024)

Robust Beamforming With Multi-Panel Array for mmWave Channels Over Mobility and Blockage. - Kanta Terui; Kabuto Arai; Koji Ishibashi (VTC Fall, 2024)

Clustering and Beamforming for User-Centric Cell-Free Massive MIMO With Backhaul Capacity Limitation. - Masaaki Ito; Shuto Fukue; Kengo Ando; Issei Kanno; Kosuke Yamazaki; Koji Ishibashi (IEEE Access, 2024)

Blockage-Robust Hybrid Beamforming Enabling High Sum Rate for Millimeter-Wave OFDM Systems. - Sota Uchimura; Giuseppe Thadeu Freitas de Abreu; Koji Ishibashi (IEEE Trans. Wirel. Commun., 2024)

User-Centric Resource Allocation in Downlink Multi-Carrier NOMA System With Coexistence of URLLC and eMBB Users. - Nann Win Moe Thet; Koji Ishibashi (IEEE Trans. Veh. Technol., 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)

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)

Distortion-Aware Clustering for Cell-Free Massive MIMO Under Backhaul Capacity Limitation. - Faurdoir Ndimumahoro; Koji Ishibashi (CCNC, 2025)

Leakage Minimization in Network-Assisted Full-Duplex Cell-Free Massive MIMO Systems. - Koushi Okui; Kengo Ando; Giuseppe Abreu; Koji Ishibashi (ICNC, 2025)

Differential Modulation Based Non-Coherent Grant-Free NOMA Under Timing Offsets. - Eiji Yoshimura; Takanori Hara; Kohei Ueda; Koji Ishibashi; Kenichi Higuchi (WCNC, 2025)

Cooperative Detection for Cell-Free Massive MIMO With Multiple Central Processing Units Under Backhaul Capacity Limitation. - Faurdoir Ndimumahoro; Koji Ishibashi (IEEE Access, 2025)

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)

Joint Channel, CFO, and Data Estimation via Bayesian Inference for Multi-User MIMO-OFDM Systems. - Kenta Ito; Takumi Takahashi; Koji Ishibashi; Koji Igarashi; Shinsuke Ibi (IEEE Trans. Wirel. Commun., 2025)

Joint Design of Equalization and Beamforming for Single-Carrier MIMO Transmission Over Millimeter-Wave and Sub-Terahertz Channels. - Sota Uchimura; Kengo Ando; Giuseppe Thadeu Freitas de Abreu; Koji Ishibashi (IEEE Trans. Wirel. Commun., 2025)

Exploiting Low-Density Signal Structure via Approximate Message Passing With Side Information for Grant-Free NOMA. - Kohei Ueda; Takanori Hara; Koji Ishibashi (IEEE Trans. Wirel. Commun., 2025)

ZEN-MAC: Zero Excess Node MAC for Multihop Sensor Networks With Energy Harvesting. - Tatsuhiro Kawaguchi; Koji Ishibashi (IEEE Internet Things J., 2025)