Please check the webpage at my former university for older publications as well. Feel free to contact me per E-mail, if you wish to obtain a PDF version of a paper not linked here or check out one of the following links:
Kenji Leibnitz, Ferdinand Peper, Naoki Wakamiya, and Mikio Hasegawa, "Evaluating Error Correction in Asynchronous Pulse Code Multiple Access for Massive IoT", submitted.
The papers marked as "in preparation" are currently work in progress or only intended publications and the given titles are tentative.