| 2021 | VTC | Channel Allocation for LoRaWanConsidering Intra-System and Inter-System Interferences. | Shinichiro Kakuda, Yudai Yamazaki, Keita Katagiri, Takeo Fujii, Osamu Takyu, Mai Ohta, Koichi Adachi |
| 2020 | VTC | Experimental Verification of Shadowing Classification for Radio Map. | Keita Katagiri, Koya Sato, Kei Inage, Takeo Fujii |
| 2020 | WCNC | Radio Environment Map Updating Procedure Considering Change of Surrounding Environment. | Keita Katagiri, Takeo Fujii |
| 2019 | VTC | Highly Accurate Prediction of Radio Propagation Using Model Classifier. | Keita Katagiri, Keita Onose, Koya Sato, Kei Inage, Takeo Fujii |
| 2019 | VTC | Clustering of Signal Power Distribution toward Low Storage Crowdsourced Spectrum Database. | Yoji Uesugi, Keita Katagiri, Koya Sato, Kei Inage, Takeo Fujii |
| 2019 | WCNC | High Density Spectrum Sharing Method among Micro Operators considering Spectrum Database. | Hirofumi Nakajo, Yuya Aoki, Keita Katagiri, Takeo Fujii |
| 2017 | VTC | Crowdsourcing-Assisted Radio Environment Maps for V2V Communication Systems. | Keita Katagiri, Koya Sato, Takeo Fujii |