| 2026 | INFOCOM | Demo: Energy-Harvesting Multihop Sensor Networks With an Ultra-Low-Power Receiver-Initiated MAC. | Tatsuhiro Kawaguchi, Koji Ishibashi |
| 2026 | INFOCOM | Downlink Precoding Using Affine Combination of Spatial Covariance Eigenvectors for Cell-Free Massive MIMO Systems. | Yuki Shinhama, Kabuto Arai, Koji Ishibashi, Shunsuke Kamiwatari, Shuto Fukue, Issei Kanno |
| 2025 | ACSSC | Optimization of Waveform and Wavefront for Sub-Terahertz Communications Systems. | Sota Uchimura, Josep Miquel Jornet, Koji Ishibashi |
| 2025 | VTC | Quantum Speedup for Pilot Assignment Problems. | Taku Mikuriya, Kengo Ando, Kein Yukiyoshi, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi, Naoki Ishikawa |
| 2025 | VTC | Quantum-Assisted Maximum Likelihood Detection of Generalized Spatial Modulation. | Taku Mikuriya, Hyeon Seok Rou, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi, Naoki Ishikawa |
| 2025 | VTC | Analysis of Average Blockage Loss With Uniform Linear Array Over Millimeter-Wave Channels. | Daiya Miyamoto, Kanta Terui, Kabuto Arai, Koji Ishibashi |
| 2025 | WCNC | Differential Modulation Based Non-Coherent Grant-Free NOMA Under Timing Offsets. | Eiji Yoshimura, Takanori Hara, Kohei Ueda, Koji Ishibashi, Kenichi Higuchi |
| 2024 | ACSSC | Robust Beamfocusing Against Positioning Errors Over Sub-Terahertz LOS Channels. | Sota Uchimura, Koji Ishibashi, Josep Miquel Jornet |
| 2024 | ACSSC | Outage-Minimization Power and Spectrum Allocation for Terahertz Communications Systems. | Sota Uchimura, Koji Ishibashi, Josep Miquel Jornet |
| 2024 | VTC | 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 |
| 2024 | VTC | Robust Beamforming With Multi-Panel Array for mmWave Channels Over Mobility and Blockage. | Kanta Terui, Kabuto Arai, Koji Ishibashi |
| 2023 | VTC | Self-Calibration for Channel Estimation in Hybrid Millimeter-Wave MIMO Systems. | Kabuto Arai, Koji Ishibashi |
| 2023 | VTC | Scalable Network-Assisted Full-Duplex Cell-Free Massive MIMO With Limited Fronthaul Capacity. | Koushi Okui, Kengo Ando, Giuseppe Abreu, Koji Ishibashi |
| 2023 | VTC | Packet Aggregation Utilizing Multi-Antenna Beamforming in IRDT Protocol. | Keigo Saito, Takeo Fujii, Koji Ishibashi, Yu Shibata, Soma Toki, Hideki Endo |
| 2023 | WCNC | Hybrid Beamforming for Outage-Minimization in Frequency Selective Millimeter-Wave Channels. | Sota Uchimura, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi |
| 2022 | PIMRC | Iterative Activity Detection and Carrier Frequency Offset Estimation for Grant-Free NOMA. | Kohei Ueda, Takanori Hara, Koji Ishibashi |
| 2020 | ACSSC | Discrete-Aware Matrix Completion via Proximal Gradient. | Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Omid Taghizadeh, Koji Ishibashi |
| 2020 | GLOBECOM | Full-Duplex MIMO Systems with Hardware Limitations and Imperfect Channel Estimation. | Hiroki Iimori, Giuseppe Thadeu Freitas de Abreu, Koji Ishibashi |
| 2020 | WCNC | 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, Shinobu Nanba, Takanori Hara, Fumiyuki Adachi, Takayuki Sotoyama |
| 2019 | ACSSC | Low Complexity Uplink Grant-Free NOMA Based on Boosted Approximate Message Passing. | Takanori Hara, Koji Ishibashi |
| 2019 | WCNC | 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 |
| 2019 | WCNC | Transmission Strategies in Imperfect Bi-directional Full-Duplex MIMO Systems. | Hiroki Iimori, Giuseppe Abreu, Koji Ishibashi, George C. Alexandropoulos |
| 2019 | WCNC | Design of Communication Systems for Wireless-Powered Communications with Multiple Frequency Bands. | Ryuhei Takahashi, Koji Ishibashi |
| 2019 | WiOpt | Fractional Programming for Robust TX BF Design in Multi-User/Single-Carrier PD-NOMA. | Hiroki Iimori, Giuseppe Abreu, Koji Ishibashi |
| 2018 | ACSSC | ZigZag Decodable Frameless ALOHA. | Shun Ogata, Koji Ishibashi |
| 2017 | WCNC | Robust Coded Cooperation Based on Multi-Dimensional Spatially-Coupled Repeat-Accumulate Codes. | Ryosuke Tanaka, Koji Ishibashi |
| 2016 | ACSSC | Energy-efficient random sleep protocol based on distributed coding for sensor-to-vehicle communications. | Yuki Goto, Shun Ogata, Koji Ishibashi |
| 2016 | ISITA | QR-decomposed generalized belief propagation for MIMO detection. | Akihide David Shigyo, Shogo Tanabe, Koji Ishibashi |
| 2016 | ISITA | Not-so-large MIMO signal detection based on damped QR-decomposed belief propagation. | Shogo Tanabe, Akihide David Shigyo, Koji Ishibashi |
| 2015 | ACSSC | Frameless ALOHA with multiple base stations. | Shun Ogata, Koji Ishibashi |
| 2015 | WCNC | Spatially coupled repeat-accumulate coded cooperation. | Naoki Takeishi, Koji Ishibashi |
| 2014 | ICASSP | Analysis of RF energy harvesting in large-scale networks using absorption function. | Koji Ishibashi, Giuseppe Abreu |
| 2014 | PIMRC | RF energy powered feedback-aided cooperation. | Hiroki Kawabata, Koji Ishibashi |
| 2013 | PIMRC | Superimposed adaptive network coded cooperation for wireless sensor networks. | Naoki Takeishi, Koji Ishibashi, Yasushi Yamao |
| 2012 | PIMRC | Energy harvesting cooperative communications. | Koji Ishibashi, Hideki Ochiai, Vahid Tarokh |
| 2011 | ACSSC | The gaussian two-way relay channel with wiretapper. | Sungsoo Kim, Won-Yong Shin, Koji Ishibashi |
| 2011 | GLOBECOM | A peak power efficient cooperative diversity using star-QAM. | Koji Ishibashi, Won-Yong Shin, Hyoseok Yi, Hideki Ochiai |
| 2011 | PIMRC | A study on outage probability of collaborative multi-hop transmissions with non-uniformly distributed networks. | Toshiki Kobayashi, Koji Ishibashi, Tadahiro Wada |
| 2010 | ISITA | Performance evaluation of Go-Back-i-symbol ARQ scheme applicable to meteor burst communications. | Shinsuke Nagata, Kaiji Mukumoto, Tadahiro Wada, Koji Ishibashi |
| 2009 | GLOBECOM | A Proposal of New Hybrid ARQ Scheme Suitable for Multi-Hop Transmissions Using LDPC Codes. | Takayuki Hashimoto, Tetsuya Wakiyama, Koji Ishibashi, Tadahiro Wada |
| 2009 | VTC | A Proposal of New Hybrid ARQ Scheme using Rate Compatible LDPC Codes for Multi-hop Transmissions. | Takayuki Hashimoto, Tetsuya Wakiyama, Koji Ishibashi, Tadahiro Wada |
| 2009 | VTC | Design of Adaptive Coded Cooperation using Rate Compatible Turbo Codes. | Koji Ishibashi, Koji Ishii, Hideki Ochiai |
| 2008 | GLOBECOM | Diversity Order Analysis of Bit-Interleaved Coded DPSK with Cyclic Delay Diversity. | Koji Ishibashi, Koji Ishii, Hideki Ochiai |
| 2007 | GLOBECOM | Embedded Forward Error Control Technique (EFECT) for Low-Rate Real-Time Communications. | Koji Ishibashi, Hideki Ochiai, Ryuji Kohno |
| 2007 | PIMRC | Tomlinson-Harashima Precoded MIMO System with Differential Detection. | Saori Fukushi, Koji Ishibashi, Ryuji Kohno |
| 2007 | PIMRC | Low Complexity Bit-Interleaved Coded DAPSK with Cyclic Delay Diversity. | Koji Ishibashi, Hideki Ochiai, Ryuji Kohno |
| 2007 | PIMRC | Performance of Cognitive Radio Technologies in the Presence of Primary Radio Systems. | Kotaro Watanabe, Koji Ishibashi, Ryuji Kohno |
| 2006 | VTC | On the Performance of LDPC Codes with Differential Detection over Rayleigh Fading Channels. | Hiroshi Tatsunami, Koji Ishibashi, Hideki Ochiai |