電波伝搬特性を生かしたランダムアクセス方式の研究

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We are progressing according to the original plan in 2022, and achieved the following results.Irregular Repetition Slotted ALOHA (IR-SA) scheme is an example of unsourced random access communications. It is simple and practical for applications. Over fading channels, however, the limit performances, i.e., theoretical bounds, of the IR-SA are unknown. In 2022, one of our works is to derive two theoretical bounds of IR-SA over fading channels: a maximum a posteriori (MAP) threshold and a converse bound. The MAP threshold is a theoretical upper bound of a practical decoding performance. The converse bound expresses an impossibility threshold to be approached. The bounds are guidelines for practical implementation of IR-SA.