Koji Ishibashi

ORCID

Publication Activity (10 Years)

Years Active: 2004-2024
Publications (10 Years): 84

Top Venues

IEEE Access

WCNC

IEEE Wirel. Commun. Lett.

IEEE Trans. Wirel. Commun.

Publications

Takumi Yoshida, Takumi Takahashi, Koji Ishibashi
Low-Complexity Cross-Domain Iterative Detection Based on Local LMMSE Filters for OTFS. ICC Workshops (2024)
Nann Win Moe Thet, Koji Ishibashi
User-Centric Resource Allocation in Downlink Multi-Carrier NOMA System With Coexistence of URLLC and eMBB Users. IEEE Trans. Veh. Technol. 73 (8) (2024)
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) (2024)
Sota Uchimura, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
Blockage-Robust Hybrid Beamforming Enabling High Sum Rate for Millimeter-Wave OFDM Systems. IEEE Trans. Wirel. Commun. 23 (7) (2024)
Shunsuke Kamiwatari, Masaaki Ito, Issei Kanno, Kengo Ando, Koji Ishibashi
Interference-Aware Analog Beam Selection for Cell-Free Massive MIMO With Hybrid Beamforming Over Millimeter-Wave Channels. CCNC (2024)
Masaaki Ito, Shuto Fukue, Kengo Ando, Issei Kanno, Kosuke Yamazaki, Koji Ishibashi
Clustering and Beamforming for User-Centric Cell-Free Massive MIMO With Backhaul Capacity Limitation. IEEE Access 12 (2024)
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) (2023)
Yuma Katsuki, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi, Naoki Ishikawa
A New Noncoherent Gaussian Signaling Scheme for Low Probability of Detection Communications. IEEE Wirel. Commun. Lett. 12 (3) (2023)
Keigo Saito, Takeo Fujii, Koji Ishibashi, Yu Shibata, Soma Toki, Hideki Endo
Packet Aggregation Utilizing Multi-Antenna Beamforming in IRDT Protocol. VTC Fall (2023)
Kabuto Arai, Koji Ishibashi
Self-Calibration for Channel Estimation in Hybrid Millimeter-Wave MIMO Systems. VTC Fall (2023)
Yuma Katsuki, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi, Naoki Ishikawa
A New Noncoherent Gaussian Signaling Scheme for Low Probability of Detection Communications. CoRR (2023)
Kenta Miwa, Kengo Ando, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
Physical-Layer Authentication Over Spatially Correlated MIMO Channels. WPMC (2023)
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) (2023)
Yuma Katsuki, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi, Naoki Ishikawa
Noncoherent Massive MIMO With Embedded One-Way Function Physical Layer Security. IEEE Trans. Inf. Forensics Secur. 18 (2023)
Koushi Okui, Kengo Ando, Giuseppe Abreu, Koji Ishibashi
Scalable Network-Assisted Full-Duplex Cell-Free Massive MIMO With Limited Fronthaul Capacity. VTC Fall (2023)
Shuto Fukue, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
Network-Assisted Full-Duplex Millimeter-Wave Cell-Free Massive MIMO with Localization-Aided Inter-User Channel Estimation. ICOIN (2023)
Sota Uchimura, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
Hybrid Beamforming for Outage-Minimization in Frequency Selective Millimeter-Wave Channels. WCNC (2023)
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)
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 (2022)
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 (2022)
Jun Nagai, Koji Ishibashi, Yasushi Yamao
Signal Quality Improvement in Downlink Power Domain NOMA with Blind Nonlinear Compensator and Frequency Domain Equalizer. IEICE Trans. Commun. (5) (2022)
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) (2022)
Koji Ishibashi, Takanori Hara, Sota Uchimura, Tetsuya Iye, Yoshimi Fujii, Takahide Murakami, Hiroyuki Shinbo
User-Centric Design of Millimeter Wave Communications for Beyond 5G and 6G. IEICE Trans. Commun. (10) (2022)
Takanori Hara, Hiroki Iimori, Koji Ishibashi
Grant-Free NOMA Using Time-Delay Domain for Low-Latency Massive Access over MIMO-OFDM. ICC (2022)
Takanori Hara, Koji Ishibashi
Blind Multiple Measurement Vector AMP Based on Expectation Maximization for Grant-Free NOMA. IEEE Wirel. Commun. Lett. 11 (6) (2022)
Ayaka Urabe, Koji Ishibashi, Mohammad Javad Salehi, Antti Tölli
Beamforming Design for Wireless Coded Caching with Different Cache Sizes. SPAWC (2022)
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)
Kohei Ueda, Takanori Hara, Koji Ishibashi
Iterative Activity Detection and Carrier Frequency Offset Estimation for Grant-Free NOMA. PIMRC (2022)
Takanori Hara, Hiroki Iimori, Koji Ishibashi
Hyperparameter-Free Receiver for Grant-Free NOMA Systems With MIMO-OFDM. IEEE Wirel. Commun. Lett. 10 (4) (2021)
Takanori Hara, Ryuhei Takahashi, Koji Ishibashi
Ambient OFDM Pilot-Aided Backscatter Communications: Concept and Design. IEEE Access 9 (2021)
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) (2021)
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 (2021)
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 (2021)
Andre Saito Guerreiro, Hiroki Iimori, Koji Ishibashi
Low Latency Beam-Sweeping for Millimeter Wave Systems via Pessimistic Optimization. IEEE Wirel. Commun. Lett. 10 (12) (2021)
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 (2021)
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
Research Project to Realize Various High-reliability Communications in Advanced 5G Network. WCNC (2020)
Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi
Full-Duplex MIMO Systems with Hardware Limitations and Imperfect Channel Estimation. GLOBECOM (2020)
Ryo Okabe, Hiroki Iimori, Koji Ishibashi
Low-Complexity Robust Beamforming with Blockage Prediction for Millimeter-Wave Communications. APSIPA (2020)
Naoya Hirosawa, Hiroki Iimori, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu
Minimizing Age of Information in Energy Harvesting Wireless Sensor Networks. IEEE Access 8 (2020)
Masaru Oinaga, Shun Ogata, Koji Ishibashi
Received-Power-Aware Frameless ALOHA for Grant-Free Non-Orthogonal Multiple Access. ICOIN (2020)
Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Omid Taghizadeh, Koji Ishibashi
Discrete-Aware Matrix Completion via Proximal Gradient. ACSSC (2020)
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) (2020)
Takanori Hara, Koji Ishibashi
Grant-Free NOMA Using Approximate Message Passing with Multi-Measurement Vector. ICOIN (2020)
Ryota Yatsu, Takanori Hara, Koji Ishibashi, Sota Tsuchiya, Hideki Endo
Packet Aggregation Based on Encryption-Then-Compression for Highly Efficient Multi-Hop Transmission. APSIPA (2020)
Takanori Hara, Hiroki Iimori, Koji Ishibashi
Activity Detection for Uplink Grant-Free NOMA in the Presence of Carrier Frequency Offsets. ICC Workshops (2020)
Hiroki Iimori, Razvan-Andrei Stoica, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu
Robust Sparse Reconstruction of mmWave Channel Estimates via Fractional Programming. ICOIN (2020)
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 (2019)
Massimo Giordano, Giorgio Cristiano, Koji Ishibashi, Stefano Ambrogio, Hsinyu Tsai, Geoffrey W. Burr, Pritish Narayanan
Analog-to-Digital Conversion With Reconfigurable Function Mapping for Neural Networks Activation Function Acceleration. IEEE J. Emerg. Sel. Topics Circuits Syst. 9 (2) (2019)
Takanori Hara, Koji Ishibashi
Grant-Free Non-Orthogonal Multiple Access With Multiple-Antenna Base Station and Its Efficient Receiver Design. IEEE Access 7 (2019)
Masaru Oinaga, Shun Ogata, Koji Ishibashi
Design of Coded ALOHA With ZigZag Decoder. IEEE Access 7 (2019)
Shun Ogata, Koji Ishibashi
Application of ZigZag Decoding in Frameless ALOHA. IEEE Access 7 (2019)
Takanori Hara, Koji Ishibashi
Low Complexity Uplink Grant-Free NOMA Based on Boosted Approximate Message Passing. ACSSC (2019)
Takanori Hara, Razvan-Andrei Stoica, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu
On the Sum-Rate Capacity and Spectral Efficiency Gains of Massively Concurrent NOMA Systems. WCNC (2019)
Manato Takai, Koji Ishibashi
Repeat-Accumulate Signal Codes. IEEE Trans. Commun. 67 (4) (2019)
Hiroki Iimori, Giuseppe Abreu, Koji Ishibashi
Fractional Programming for Robust TX BF Design in Multi-User/Single-Carrier PD-NOMA. WiOpt (2019)
Siddhartha Sarma, Koji Ishibashi
Time-to-Recharge Analysis for Energy-Relay-Assisted Energy Harvesting. IEEE Access 7 (2019)
Manato Takai, Koji Ishibashi
Spatially Coupled Repeat-Accumulate Signal Codes. RWS (2019)
Ryuhei Takahashi, Koji Ishibashi
Ambient OFDM Pilot-Aided Delay-Shift Keying and Its Efficient Detection for Ultra Low-Power Communications. GlobalSIP (2019)
Ryuhei Takahashi, Koji Ishibashi
Design of Communication Systems for Wireless-Powered Communications with Multiple Frequency Bands. WCNC (2019)
Razvan-Andrei Stoica, Giuseppe Thadeu Freitas de Abreu, Takanori Hara, Koji Ishibashi
Massively Concurrent Non-Orthogonal Multiple Access for 5G Networks and Beyond. IEEE Access 7 (2019)
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)
Hiroki Iimori, Giuseppe Abreu, Koji Ishibashi, George C. Alexandropoulos
Transmission Strategies in Imperfect Bi-directional Full-Duplex MIMO Systems. WCNC (2019)
Takanori Hara, Koji Ishibashi, Soon Xin Ng, Lajos Hanzo
Low-Complexity Generator Polynomial Search for Turbo Trellis-Coded Spatial Modulation Using Symbol-based EXIT Charts. ISTC (2018)
Kazuya Ohira, Takanori Hara, Koji Ishibashi
Aggregate-Compression-Aided Subcarrier IQ Index Modulation. WPNC (2018)
Ryo Tanabe, Tatsuhiro Kawaguchi, Ryohei Takitoge, Koichiro Ishibashi, Koji Ishibashi
Energy-aware receiver-driven medium access control protocol for wireless energy-harvesting sensor networks. CCNC (2018)
Shun Ogata, Koji Ishibashi, Giuseppe Thadeu Freitas de Abreu
Optimized Frameless ALOHA for Cooperative Base Stations With Overlapped Coverage Areas. IEEE Trans. Wirel. Commun. 17 (11) (2018)
Shun Ogata, Koji Ishibashi
Coded Frameless ALOHA. WPNC (2018)
Shun Ogata, Koji Ishibashi
ZigZag Decodable Frameless ALOHA. ACSSC (2018)
Tatsuhiro Kawaguchi, Ryo Tanabe, Ryohei Takitouge, Koichiro Ishibashi, Koji Ishibashi
Implementation of condition-aware receiver-initiated MAC protocol to realize energy-harvesting wireless sensor networks. CCNC (2018)
Akihide David Shigyo, Koji Ishibashi
A Simple Message Passing Detector Based on QR-Decomposition for MIMO Systems. APSIPA (2018)
Yuki Goto, Koji Ishibashi
Practical green information delivery protocol for sensor-to-vehicle communications. CCNC (2018)
Masaru Oinaga, Shun Ogata, Koji Ishibashi
ZigZag Decodable Coded Slotted ALOHA. WPNC (2018)
Manato Takai, Koji Ishibashi
Repeat-Accumulate Signal Codes. CoRR (2018)
Shun Ogata, Koji Ishibashi, Giuseppe Abreu
Optimized Frameless ALOHA for Cooperative Base Stations with Overlapped Coverage Areas. CoRR (2017)
Akihide David Shigyo, Koji Ishibashi
QR-decomposed generalized belief propagation with smart message reduction for low-complexity MIMO signal detection. APSIPA (2017)
Shun Ogata, Koji Ishibashi, Giuseppe Abreu
Multi-access diversity gain via multiple base station cooperation in frameless ALOHA. SPAWC (2017)
Ryosuke Tanaka, Koji Ishibashi
Robust Coded Cooperation Based on Multi-Dimensional Spatially-Coupled Repeat-Accumulate Codes. WCNC (2017)
Hiroki Kawabata, Koji Ishibashi, Satyanarayana Vuppala, Giuseppe Thadeu Freitas de Abreu
Robust Relay Selection for Large-Scale Energy-Harvesting IoT Networks. IEEE Internet Things J. 4 (2) (2017)
Vien V. Mai, Won-Yong Shin, Koji Ishibashi
Wireless Power Transfer for Distributed Estimation in Sensor Networks. IEEE J. Sel. Top. Signal Process. 11 (3) (2017)
Vien V. Mai, Won-Yong Shin, Koji Ishibashi
Wireless Power Transfer for Distributed Estimation in Sensor Networks. CoRR (2017)
Yuki Goto, Shun Ogata, Koji Ishibashi
Energy-efficient random sleep protocol based on distributed coding for sensor-to-vehicle communications. ACSSC (2016)
Akihide David Shigyo, Shogo Tanabe, Koji Ishibashi
QR-decomposed generalized belief propagation for MIMO detection. ISITA (2016)
Huifa Lin, Koji Ishibashi, Won-Yong Shin, Takeo Fujii
Decentralized power allocation for secondary random access in cognitive radio networks with successive interference cancellation. ICC (2016)
Shogo Tanabe, Akihide David Shigyo, Koji Ishibashi
Not-so-large MIMO signal detection based on damped QR-decomposed belief propagation. ISITA (2016)
Koji Ishibashi, Chin Keong Ho, Ioannis Krikidis
Diversity-Multiplexing Tradeoff of Dynamic Harvest-and-Forward Cooperation. IEEE Wirel. Commun. Lett. 4 (6) (2015)
Huifa Lin, Koji Ishibashi, Won-Yong Shin, Takeo Fujii
A Simple Random Access Scheme With Multilevel Power Allocation. IEEE Commun. Lett. 19 (12) (2015)
Naoki Takeishi, Koji Ishibashi
Spatially coupled repeat-accumulate coded cooperation. WCNC (2015)
Jingze Dai, Koji Ishibashi, Yasushi Yamao
Highly Efficient Multi-Hop Packet Transmission Using Intra-Flow Interference Cancellation and Maximal-Ratio Combining. IEEE Trans. Wirel. Commun. 14 (11) (2015)
Keisuke Hirose, Koji Ishibashi, Yasushi Yamao, Yasuhiro Hirayama, Manabu Sawada
Low-power V2M communication system with fast network association capability. WF-IoT (2015)
Shun Ogata, Koji Ishibashi
Frameless ALOHA with multiple base stations. ACSSC (2015)
Huifa Lin, Koji Ishibashi, Won-Yong Shin, Takeo Fujii
Decentralized Multilevel Power Allocation for Random Access. IEICE Trans. Commun. (10) (2015)
Koji Ishibashi
Dynamic harvest-and-forward: New cooperative diversity with RF energy harvesting. WCSP (2014)
Manato Takai, Koji Ishibashi, Tadahiro Wada
Semi-blind interference alignment over correlated wireless channels. RWS (2014)
Koji Ishibashi, Giuseppe Abreu
Analysis of RF energy harvesting in large-scale networks using absorption function. ICASSP (2014)
Koji Ishibashi, Shinya Sugiura
Effects of Antenna Switching on Band-Limited Spatial Modulation. IEEE Wirel. Commun. Lett. 3 (4) (2014)
Yuelin Ma, Yasushi Yamao, Yoshihiko Akaiwa, Koji Ishibashi
Wideband Digital Predistortion Using Spectral Extrapolation of Band-Limited Feedback Signal. IEEE Trans. Circuits Syst. I Regul. Pap. (7) (2014)
Huifa Lin, Koji Ishibashi, Takeo Fujii
Serially-concatenated layered network coded cooperation for wireless sensor networks. WPMC (2014)
Hiroki Kawabata, Koji Ishibashi
RF energy powered feedback-aided cooperation. PIMRC (2014)
Yuki Matsuzawa, Yasushi Yamao, Kenta Otake, Koji Ishibashi
Multi-hop transmission performance of integrated dynamic multi-hopping for wireless ad hoc networks. CCNC (2014)
Koji Ishibashi, Won-Yong Shin, Hideki Ochiai, Vahid Tarokh
A Peak Power Efficient Cooperative Diversity using Star-QAM with Coherent/Noncoherent Detection. IEEE Trans. Wirel. Commun. 12 (5) (2013)

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Publication Activity (10 Years)

Top Topics

Top Venues

Koji Ishibashi