Koji Ishibashi

166 papers B 21C 3Misc 8Journal 74Unranked 60
YearRankTypeTitle / Venue / Authors
2026 J jnl
Adaptively Weighted Averaging Over-the-Air Computation and Its Application to Distributed Gaussian Process Regression.
IEEE Trans. Cogn. Commun. Netw.
Koya Sato, Koji Ishibashi
2026 J jnl
Deterministic and Stochastic Optimization for Robust Beamfocusing Against Positioning Errors.
IEEE Trans. Wirel. Commun.
Sota Uchimura, Koji Ishibashi, Josep Miquel Jornet
2026 Misc conf
Feasibility Study of Zero Excess Node MAC (ZEN-MAC) for Ultra-Low-Power Communications.
ICNC
Tatsuhiro Kawaguchi, Koji Ishibashi
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 — conf
Joint Clustering and Beamforming Design for Energy-Efficient Scalable Network-Assisted Full-Duplex Cell-Free Massive MIMO.
CCNC
Yuya Mito, Koushi Okui, Kohei Ueda, Koji Ishibashi
2026 J jnl
Optimal Wavefronts for Maximum Ratio Transmissions Under Path Blockage Effects.
IEEE Trans. Wirel. Commun.
Sota Uchimura, Josep Miquel Jornet, Koji Ishibashi
2026 J jnl
Optimization and Characterization of Near-Field Beams With Uniform Linear Arrays.
IEEE Trans. Wirel. Commun.
Sota Uchimura, Josep Miquel Jornet, Koji Ishibashi
2025 — conf
Analysis of Average Blockage Loss With Uniform Linear Array Over Millimeter-Wave Channels.
VTC2025-Fall
Daiya Miyamoto, Kanta Terui, Kabuto Arai, Koji Ishibashi
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 J jnl
Channel Estimation for Hybrid MIMO Systems With Array Model Errors and Beam Squint Effects.
IEEE Trans. Veh. Technol.
Kabuto Arai, Koji Ishibashi
2025 J jnl
Cooperative Detection for Cell-Free Massive MIMO With Multiple Central Processing Units Under Backhaul Capacity Limitation.
IEEE Access
Faurdoir Ndimumahoro, Koji Ishibashi
2025 J jnl
Cross-Domain Joint Channel and Data Estimation for mmWave MIMO-OFDM Systems With Low-Resolution ADCs.
IEEE J. Sel. Top. Signal Process.
Kenta Ito, Takumi Takahashi, Koji Ishibashi, Shinsuke Ibi, Hideki Ochiai
2025 B conf
Differential Modulation Based Non-Coherent Grant-Free NOMA Under Timing Offsets.
WCNC
Eiji Yoshimura, Takanori Hara, Kohei Ueda, Koji Ishibashi, Kenichi Higuchi
2025 — conf
Distortion-Aware Clustering for Cell-Free Massive MIMO Under Backhaul Capacity Limitation.
CCNC
Faurdoir Ndimumahoro, Koji Ishibashi
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
Exploiting Low-Density Signal Structure via Approximate Message Passing With Side Information for Grant-Free NOMA.
IEEE Trans. Wirel. Commun.
Kohei Ueda, Takanori Hara, Koji Ishibashi
2025 J jnl
Joint Channel, CFO, and Data Estimation via Bayesian Inference for Multi-User MIMO-OFDM Systems.
IEEE Trans. Wirel. Commun.
Kenta Ito, Takumi Takahashi, Koji Ishibashi, Koji Igarashi, Shinsuke Ibi
2025 J jnl
Joint Design of Equalization and Beamforming for Single-Carrier MIMO Transmission Over Millimeter-Wave and Sub-Terahertz Channels.
IEEE Trans. Wirel. Commun.
Sota Uchimura, Kengo Ando, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
2025 Misc conf
Leakage Minimization in Network-Assisted Full-Duplex Cell-Free Massive MIMO Systems.
ICNC
Koushi Okui, Kengo Ando, Giuseppe Abreu, Koji Ishibashi
2025 — conf
Optimization of Waveform and Wavefront for Sub-Terahertz Communications Systems.
IEEECONF
Sota Uchimura, Josep Miquel Jornet, Koji Ishibashi
2025 — conf
Quantum Speedup for Pilot Assignment Problems.
VTC2025-Spring
Taku Mikuriya, Kengo Ando, Kein Yukiyoshi, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi, Naoki Ishikawa
2025 — conf
Quantum-Assisted Maximum Likelihood Detection of Generalized Spatial Modulation.
VTC2025-Fall
Taku Mikuriya, Hyeon Seok Rou, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi, Naoki Ishikawa
2025 J jnl
ZEN-MAC: Zero Excess Node MAC for Multihop Sensor Networks With Energy Harvesting.
IEEE Internet Things J.
Tatsuhiro Kawaguchi, Koji Ishibashi
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
Blockage-Robust Hybrid Beamforming Enabling High Sum Rate for Millimeter-Wave OFDM Systems.
IEEE Trans. Wirel. Commun.
Sota Uchimura, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
2024 J jnl
Clustering and Beamforming for User-Centric Cell-Free Massive MIMO With Backhaul Capacity Limitation.
IEEE Access
Masaaki Ito, Shuto Fukue, Kengo Ando, Issei Kanno, Kosuke Yamazaki, Koji Ishibashi
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
Human Blockage Analysis at 5G Millimeter Wave Frequencies Using a High-Resolution Voxel Model.
APWCS
Kun Li, Hongda Xu, Xiaolong Wang, Koji Ishibashi
2024 — conf
Interference-Aware Analog Beam Selection for Cell-Free Massive MIMO With Hybrid Beamforming Over Millimeter-Wave Channels.
CCNC
Shunsuke Kamiwatari, Masaaki Ito, Issei Kanno, Kengo Ando, Koji Ishibashi
2024 — conf
Low-Complexity Cross-Domain Iterative Detection Based on Local LMMSE Filters for OTFS.
ICC Workshops
Takumi Yoshida, Takumi Takahashi, Koji Ishibashi
2024 — conf
Multi-Hop Communication System with Multi-Antenna Beamforming in IRDT Protocol.
VTC Fall
Keigo Saito, Takeo Fujii, Koji Ishibashi, Yu Shibata, Soma Toki, Jumpei Doi, Toru Hatae
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
Outage-Minimization Power and Spectrum Allocation for Terahertz Communications Systems.
IEEECONF
Sota Uchimura, Koji Ishibashi, Josep Miquel Jornet
2024 — conf
Robust Beamfocusing Against Positioning Errors Over Sub-Terahertz LOS Channels.
IEEECONF
Sota Uchimura, Koji Ishibashi, Josep Miquel Jornet
2024 — conf
Robust Beamforming With Multi-Panel Array for mmWave Channels Over Mobility and Blockage.
VTC Fall
Kanta Terui, Kabuto Arai, Koji Ishibashi
2024 J jnl
User-Centric Resource Allocation in Downlink Multi-Carrier NOMA System With Coexistence of URLLC and eMBB Users.
IEEE Trans. Veh. Technol.
Nann Win Moe Thet, Koji Ishibashi
2023 J jnl
A New Noncoherent Gaussian Signaling Scheme for Low Probability of Detection Communications.
CoRR
Yuma Katsuki, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi, Naoki Ishikawa
2023 J jnl
A New Noncoherent Gaussian Signaling Scheme for Low Probability of Detection Communications.
IEEE Wirel. Commun. Lett.
Yuma Katsuki, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi, Naoki Ishikawa
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 B conf
Hybrid Beamforming for Outage-Minimization in Frequency Selective Millimeter-Wave Channels.
WCNC
Sota Uchimura, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
2023 — conf
Network-Assisted Full-Duplex Millimeter-Wave Cell-Free Massive MIMO with Localization-Aided Inter-User Channel Estimation.
ICOIN
Shuto Fukue, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
2023 J jnl
Noncoherent Massive MIMO With Embedded One-Way Function Physical Layer Security.
IEEE Trans. Inf. Forensics Secur.
Yuma Katsuki, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi, 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 — conf
Packet Aggregation Utilizing Multi-Antenna Beamforming in IRDT Protocol.
VTC Fall
Keigo Saito, Takeo Fujii, Koji Ishibashi, Yu Shibata, Soma Toki, Hideki Endo
2023 — conf
Physical-Layer Authentication Over Spatially Correlated MIMO Channels.
WPMC
Kenta Miwa, Kengo Ando, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
2023 — conf
Scalable Network-Assisted Full-Duplex Cell-Free Massive MIMO With Limited Fronthaul Capacity.
VTC Fall
Koushi Okui, Kengo Ando, Giuseppe Abreu, Koji Ishibashi
2023 — conf
Self-Calibration for Channel Estimation in Hybrid Millimeter-Wave MIMO Systems.
VTC Fall
Kabuto Arai, Koji Ishibashi
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
Beamforming Design for Wireless Coded Caching with Different Cache Sizes.
SPAWC
Ayaka Urabe, Koji Ishibashi, Mohammad Javad Salehi, Antti Tölli
2022 J jnl
Blind Multiple Measurement Vector AMP Based on Expectation Maximization for Grant-Free NOMA.
IEEE Wirel. Commun. Lett.
Takanori Hara, Koji Ishibashi
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 B conf
Iterative Activity Detection and Carrier Frequency Offset Estimation for Grant-Free NOMA.
PIMRC
Kohei Ueda, Takanori Hara, 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
Signal Quality Improvement in Downlink Power Domain NOMA with Blind Nonlinear Compensator and Frequency Domain Equalizer.
IEICE Trans. Commun.
Jun Nagai, Koji Ishibashi, Yasushi Yamao
2022 J jnl
User-Centric Design of Millimeter Wave Communications for Beyond 5G and 6G.
IEICE Trans. Commun.
Koji Ishibashi, Takanori Hara, Sota Uchimura, Tetsuya Iye, Yoshimi Fujii, Takahide Murakami, Hiroyuki Shinbo
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
Ambient OFDM Pilot-Aided Backscatter Communications: Concept and Design.
IEEE Access
Takanori Hara, Ryuhei Takahashi, Koji Ishibashi
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
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 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
Grant-Free NOMA Using Approximate Message Passing with Multi-Measurement Vector.
ICOIN
Takanori Hara, 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
Packet Aggregation Based on Encryption-Then-Compression for Highly Efficient Multi-Hop Transmission.
APSIPA
Ryota Yatsu, Takanori Hara, Koji Ishibashi, Sota Tsuchiya, Hideki Endo
2020 — conf
Received-Power-Aware Frameless ALOHA for Grant-Free Non-Orthogonal Multiple Access.
ICOIN
Masaru Oinaga, Shun Ogata, Koji Ishibashi
2020 B conf
Research Project to Realize Various High-reliability Communications in Advanced 5G Network.
WCNC
Takahide Murakami, Yoji Kishi, Koji Ishibashi, Keisuke Kasai, Hiroyuki Shinbo, Morihiko Tamai, Kensuke Tsuda, Masataka Nakazawa, Yu Tsukamoto, Hiroyuki Yokoyama, Yoshimi Fujii, Yuta Seki, Shinobu Nanba, Takanori Hara, Fumiyuki Adachi, Takayuki Sotoyama
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 — conf
Ambient OFDM Pilot-Aided Delay-Shift Keying and Its Efficient Detection for Ultra Low-Power Communications.
GlobalSIP
Ryuhei Takahashi, Koji Ishibashi
2019 J jnl
Analog-to-Digital Conversion With Reconfigurable Function Mapping for Neural Networks Activation Function Acceleration.
IEEE J. Emerg. Sel. Topics Circuits Syst.
Massimo Giordano, Giorgio Cristiano, Koji Ishibashi, Stefano Ambrogio, Hsinyu Tsai, Geoffrey W. Burr, Pritish Narayanan
2019 J jnl
Application of ZigZag Decoding in Frameless ALOHA.
IEEE Access
Shun Ogata, Koji Ishibashi
2019 J jnl
Design of Coded ALOHA With ZigZag Decoder.
IEEE Access
Masaru Oinaga, Shun Ogata, Koji Ishibashi
2019 B conf
Design of Communication Systems for Wireless-Powered Communications with Multiple Frequency Bands.
WCNC
Ryuhei Takahashi, 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 J jnl
Grant-Free Non-Orthogonal Multiple Access With Multiple-Antenna Base Station and Its Efficient Receiver Design.
IEEE Access
Takanori Hara, Koji Ishibashi
2019 Misc conf
Low Complexity Uplink Grant-Free NOMA Based on Boosted Approximate Message Passing.
ACSSC
Takanori Hara, Koji Ishibashi
2019 J jnl
Massively Concurrent Non-Orthogonal Multiple Access for 5G Networks and Beyond.
IEEE Access
Razvan-Andrei Stoica, Giuseppe Thadeu Freitas de Abreu, Takanori Hara, Koji Ishibashi
2019 B conf
On the Sum-Rate Capacity and Spectral Efficiency Gains of Massively Concurrent NOMA Systems.
WCNC
Takanori Hara, Razvan-Andrei Stoica, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu
2019 J jnl
Repeat-Accumulate Signal Codes.
IEEE Trans. Commun.
Manato Takai, Koji Ishibashi
2019 — conf
Spatially Coupled Repeat-Accumulate Signal Codes.
RWS
Manato Takai, Koji Ishibashi
2019 J jnl
Time-to-Recharge Analysis for Energy-Relay-Assisted Energy Harvesting.
IEEE Access
Siddhartha Sarma, Koji Ishibashi
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 Simple Message Passing Detector Based on QR-Decomposition for MIMO Systems.
APSIPA
Akihide David Shigyo, Koji Ishibashi
2018 — conf
Aggregate-Compression-Aided Subcarrier IQ Index Modulation.
WPNC
Kazuya Ohira, Takanori Hara, Koji Ishibashi
2018 — conf
Coded Frameless ALOHA.
WPNC
Shun Ogata, Koji Ishibashi
2018 — conf
Energy-aware receiver-driven medium access control protocol for wireless energy-harvesting sensor networks.
CCNC
Ryo Tanabe, Tatsuhiro Kawaguchi, Ryohei Takitoge, Koichiro Ishibashi, Koji Ishibashi
2018 — conf
Implementation of condition-aware receiver-initiated MAC protocol to realize energy-harvesting wireless sensor networks.
CCNC
Tatsuhiro Kawaguchi, Ryo Tanabe, Ryohei Takitouge, Koichiro Ishibashi, Koji Ishibashi
2018 — conf
Low-Complexity Generator Polynomial Search for Turbo Trellis-Coded Spatial Modulation Using Symbol-based EXIT Charts.
ISTC
Takanori Hara, Koji Ishibashi, Soon Xin Ng, Lajos Hanzo
2018 J jnl
Optimized Frameless ALOHA for Cooperative Base Stations With Overlapped Coverage Areas.
IEEE Trans. Wirel. Commun.
Shun Ogata, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu
2018 — conf
Practical green information delivery protocol for sensor-to-vehicle communications.
CCNC
Yuki Goto, Koji Ishibashi
2018 J jnl
Repeat-Accumulate Signal Codes.
CoRR
Manato Takai, Koji Ishibashi
2018 — conf
ZigZag Decodable Coded Slotted ALOHA.
WPNC
Masaru Oinaga, Shun Ogata, Koji Ishibashi
2018 Misc conf
ZigZag Decodable Frameless ALOHA.
ACSSC
Shun Ogata, Koji Ishibashi
2017 — conf
Multi-access diversity gain via multiple base station cooperation in frameless ALOHA.
SPAWC
Shun Ogata, Koji Ishibashi, Giuseppe Abreu
2017 J jnl
Optimized Frameless ALOHA for Cooperative Base Stations with Overlapped Coverage Areas.
CoRR
Shun Ogata, Koji Ishibashi, Giuseppe Abreu
2017 — conf
QR-decomposed generalized belief propagation with smart message reduction for low-complexity MIMO signal detection.
APSIPA
Akihide David Shigyo, Koji Ishibashi
2017 B conf
Robust Coded Cooperation Based on Multi-Dimensional Spatially-Coupled Repeat-Accumulate Codes.
WCNC
Ryosuke Tanaka, Koji Ishibashi
2017 J jnl
Robust Relay Selection for Large-Scale Energy-Harvesting IoT Networks.
IEEE Internet Things J.
Hiroki Kawabata, Koji Ishibashi, Satyanarayana Vuppala, Giuseppe Thadeu Freitas de Abreu
2017 J jnl
Wireless Power Transfer for Distributed Estimation in Sensor Networks.
CoRR
Vien V. Mai, Won-Yong Shin, Koji Ishibashi
2017 J jnl
Wireless Power Transfer for Distributed Estimation in Sensor Networks.
IEEE J. Sel. Top. Signal Process.
Vien V. Mai, Won-Yong Shin, Koji Ishibashi
2016 — conf
Decentralized power allocation for secondary random access in cognitive radio networks with successive interference cancellation.
ICC
Huifa Lin, Koji Ishibashi, Won-Yong Shin, Takeo Fujii
2016 Misc conf
Energy-efficient random sleep protocol based on distributed coding for sensor-to-vehicle communications.
ACSSC
Yuki Goto, Shun Ogata, Koji Ishibashi
2016 C conf
Not-so-large MIMO signal detection based on damped QR-decomposed belief propagation.
ISITA
Shogo Tanabe, Akihide David Shigyo, Koji Ishibashi
2016 C conf
QR-decomposed generalized belief propagation for MIMO detection.
ISITA
Akihide David Shigyo, Shogo Tanabe, Koji Ishibashi
2015 J jnl
A Simple Random Access Scheme With Multilevel Power Allocation.
IEEE Commun. Lett.
Huifa Lin, Koji Ishibashi, Won-Yong Shin, Takeo Fujii
2015 J jnl
Decentralized Multilevel Power Allocation for Random Access.
IEICE Trans. Commun.
Huifa Lin, Koji Ishibashi, Won-Yong Shin, Takeo Fujii
2015 J jnl
Diversity-Multiplexing Tradeoff of Dynamic Harvest-and-Forward Cooperation.
IEEE Wirel. Commun. Lett.
Koji Ishibashi, Chin Keong Ho, Ioannis Krikidis
2015 Misc conf
Frameless ALOHA with multiple base stations.
ACSSC
Shun Ogata, Koji Ishibashi
2015 J jnl
Highly Efficient Multi-Hop Packet Transmission Using Intra-Flow Interference Cancellation and Maximal-Ratio Combining.
IEEE Trans. Wirel. Commun.
Jingze Dai, Koji Ishibashi, Yasushi Yamao
2015 — conf
Low-power V2M communication system with fast network association capability.
WF-IoT
Keisuke Hirose, Koji Ishibashi, Yasushi Yamao, Yasuhiro Hirayama, Manabu Sawada
2015 B conf
Spatially coupled repeat-accumulate coded cooperation.
WCNC
Naoki Takeishi, Koji Ishibashi
2014 Misc conf
Analysis of RF energy harvesting in large-scale networks using absorption function.
ICASSP
Koji Ishibashi, Giuseppe Abreu
2014 — conf
Dynamic harvest-and-forward: New cooperative diversity with RF energy harvesting.
WCSP
Koji Ishibashi
2014 J jnl
Effects of Antenna Switching on Band-Limited Spatial Modulation.
IEEE Wirel. Commun. Lett.
Koji Ishibashi, Shinya Sugiura
2014 — conf
Multi-hop transmission performance of integrated dynamic multi-hopping for wireless ad hoc networks.
CCNC
Yuki Matsuzawa, Yasushi Yamao, Kenta Otake, Koji Ishibashi
2014 B conf
RF energy powered feedback-aided cooperation.
PIMRC
Hiroki Kawabata, Koji Ishibashi
2014 — conf
Semi-blind interference alignment over correlated wireless channels.
RWS
Manato Takai, Koji Ishibashi, Tadahiro Wada
2014 — conf
Serially-concatenated layered network coded cooperation for wireless sensor networks.
WPMC
Huifa Lin, Koji Ishibashi, Takeo Fujii
2014 J jnl
Wideband Digital Predistortion Using Spectral Extrapolation of Band-Limited Feedback Signal.
IEEE Trans. Circuits Syst. I Regul. Pap.
Yuelin Ma, Yasushi Yamao, Yoshihiko Akaiwa, Koji Ishibashi
2013 J jnl
A Peak Power Efficient Cooperative Diversity using Star-QAM with Coherent/Noncoherent Detection.
IEEE Trans. Wirel. Commun.
Koji Ishibashi, Won-Yong Shin, Hideki Ochiai, Vahid Tarokh
2013 J jnl
Hierarchical Cooperation in Ultra-Wide Band
IEICE Trans. Commun.
Won-Yong Shin, Koji Ishibashi
2013 J jnl
Nested Transmit Diversity Based on a Joint Network-Channel Coding.
IEICE Trans. Commun.
Koji Ishii, Koji Ishibashi
2013 — conf
Semi-blind interference alignment based on OFDM over frequency selective X channels.
ICC
Manato Takai, Koji Ishibashi, Won-Yong Shin, Hyoseok Yi, Tadahiro Wada
2013 B conf
Superimposed adaptive network coded cooperation for wireless sensor networks.
PIMRC
Naoki Takeishi, Koji Ishibashi, Yasushi Yamao
2012 J jnl
Analysis of Instantaneous Power Distributions for Non-Regenerative and Regenerative Relaying Signals.
IEEE Trans. Wirel. Commun.
Koji Ishibashi, Hideki Ochiai
2012 J jnl
Effect of Multiple Antennas on the Transport Capacity in Large-Scale Ad Hoc Networks.
IEICE Trans. Commun.
Won-Yong Shin, Koji Ishibashi
2012 B conf
Energy harvesting cooperative communications.
PIMRC
Koji Ishibashi, Hideki Ochiai, Vahid Tarokh
2012 J jnl
Proposal of Go-Back-i-symbol ARQ Scheme and its Performance Evaluation in Meteor Burst Communications.
IEEE Trans. Commun.
Kaiji Mukumoto, Shinsuke Nagata, Tadahiro Wada, Koji Ishibashi
2012 J jnl
Throughput Scaling of Ultra-Wide Band Ad Hoc Networks with Infrastructure.
IEICE Trans. Commun.
Won-Yong Shin, Koji Ishibashi
2011 — conf
A peak power efficient cooperative diversity using star-QAM.
GLOBECOM Workshops
Koji Ishibashi, Won-Yong Shin, Hyoseok Yi, Hideki Ochiai
2011 B conf
A study on outage probability of collaborative multi-hop transmissions with non-uniformly distributed networks.
PIMRC
Toshiki Kobayashi, Koji Ishibashi, Tadahiro Wada
2011 J jnl
Dynamic Coded Cooperation Using Multiple Turbo Codes in Wireless Relay Networks.
IEEE J. Sel. Top. Signal Process.
Koji Ishibashi, Koji Ishii, Hideki Ochiai
2011 J jnl
Multilevel Coded Cooperation for Multiple Sources.
IEEE Trans. Wirel. Commun.
Koji Ishii, Koji Ishibashi, Hideki Ochiai
2011 — conf
Performance Analysis of Amplify and Forward Cooperation over Peak-Power Limited Channels.
ICC
Koji Ishibashi, Hideki Ochiai
2011 J jnl
Regional Diversity-Multiplexing Tradeoff.
IEICE Trans. Commun.
Won-Yong Shin, Koji Ishibashi
2011 — conf
The gaussian two-way relay channel with wiretapper.
ACSCC
Sungsoo Kim, Won-Yong Shin, Koji Ishibashi
2010 J jnl
An Analysis of Interference Mitigation Capability of Low Duty-Cycle UWB Communications in the Presence of Wideband OFDM System.
Wirel. Pers. Commun.
Keisuke Sodeyama, Koji Ishibashi, Ryuji Kohno
2010 — conf
Dynamic Turbo Coded Cooperation with Simple Power Detection.
ICC
Koji Ishibashi, Koji Ishii, Hideki Ochiai
2010 C conf
Performance evaluation of Go-Back-i-symbol ARQ scheme applicable to meteor burst communications.
ISITA
Shinsuke Nagata, Kaiji Mukumoto, Tadahiro Wada, Koji Ishibashi
2009 — conf
A Novel Cooperative Diversity Based on Multilevel Coded Modulation.
ICC
Koji Ishii, Koji Ishibashi, Hideki Ochiai
2009 B conf
A Proposal of New Hybrid ARQ Scheme Suitable for Multi-Hop Transmissions Using LDPC Codes.
GLOBECOM
Takayuki Hashimoto, Tetsuya Wakiyama, Koji Ishibashi, Tadahiro Wada
2009 — conf
A Proposal of New Hybrid ARQ Scheme using Rate Compatible LDPC Codes for Multi-hop Transmissions.
VTC Fall
Takayuki Hashimoto, Tetsuya Wakiyama, Koji Ishibashi, Tadahiro Wada
2009 — conf
A throughput performance analysis of hybrid ARQ scheme for wireless multihop networks using LDPC codes.
ICOIN
Tadahiro Wada, Tetsuya Wakiyama, Takayuki Hashimoto, Koji Ishibashi
2009 J jnl
Bit-interleaved coded DPSK with cyclic delay diversity: design and analysis.
IEEE Trans. Wirel. Commun.
Koji Ishibashi, Koji Ishii, Hideki Ochiai
2009 — conf
Design of Adaptive Coded Cooperation using Rate Compatible Turbo Codes.
VTC Fall
Koji Ishibashi, Koji Ishii, Hideki Ochiai
2008 J jnl
Dirty Paper Coded Cooperation Utilizing Superposition Modulation.
IEICE Trans. Commun.
Koji Ishii, Koji Ishibashi
2008 B conf
Diversity Order Analysis of Bit-Interleaved Coded DPSK with Cyclic Delay Diversity.
GLOBECOM
Koji Ishibashi, Koji Ishii, Hideki Ochiai
2008 J jnl
Embedded forward error control technique (EFECT) for low-rate but low latency communications.
IEEE Trans. Wirel. Commun.
Koji Ishibashi, Hideki Ochiai, Ryuji Kohno
2007 J jnl
A Scalable Model of Shielded Capacitors Using Mirror Image Effects.
IEICE Trans. Electron.
Koji Ishibashi, Ivan Chee Hong Lai, Kyoya Takano, Minoru Fujishima
2007 B conf
Embedded Forward Error Control Technique (EFECT) for Low-Rate Real-Time Communications.
GLOBECOM
Koji Ishibashi, Hideki Ochiai, Ryuji Kohno
2007 B conf
Low Complexity Bit-Interleaved Coded DAPSK with Cyclic Delay Diversity.
PIMRC
Koji Ishibashi, Hideki Ochiai, Ryuji Kohno
2007 B conf
Performance of Cognitive Radio Technologies in the Presence of Primary Radio Systems.
PIMRC
Kotaro Watanabe, Koji Ishibashi, Ryuji Kohno
2007 B conf
Tomlinson-Harashima Precoded MIMO System with Differential Detection.
PIMRC
Saori Fukushi, Koji Ishibashi, Ryuji Kohno
2006 — conf
On the Performance of LDPC Codes with Differential Detection over Rayleigh Fading Channels.
VTC Spring
Hiroshi Tatsunami, Koji Ishibashi, Hideki Ochiai
2005 J jnl
Low-complexity bit-interleaved coded DAPSK for Rayleigh-fading channels.
IEEE J. Sel. Areas Commun.
Koji Ishibashi, Hideki Ochiai, Ryuji Kohno
2004 — conf
On the performance of bit-interleaved coded DAPSK over Rayleigh fading channels.
ICC
Koji Ishibashi, Hideki Ochiai, Ryuji Kohno