Performance improvement of non-orthogonal multiple access scheme using code division multiplexing. - Hiroki Kitagawa; Eiji Okamoto (Int. J. Distributed Sens. Networks, 2017)

Chaos MIMO-based downlink non-orthogonal multiple access scheme with physical layer security. - Naoto Horiike; Hiroki Kitagawa; Eiji Okamoto; Tetsuya Yamamoto (CCNC, 2018)

On Visualization of Three-Dimensional Cellular Automata and Tilings with Head-Mounted Display. - Katsunobu Imai; Hiroki Kitagawa; Kazuma Nakahara (ASCAT, 2023)

A Drawing Time Reduction Method Considering Object Occlusions for Metaverse. - Tomoki Yoshihisa; Hiroki Kitagawa; Hideyuki Shimonishi (NBiS, 2024)