| Presentation | 2023-05-25 Blind Active User Detection for Grant-Free Access in the Presence of Timing Offsets Takanori Hara, |
|---|---|
| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | To accommodate a large number of users efficiently, grant-free non-orthogonal multiple access (GF-NOMA) has gained much attention. Although it can support many users while reducing transmission delay significantly thanks to grant-free transmission, the base station has to perform active user detection and channel estimation to recover the transmitted data. Moreover, due to the nature of grant-free transmission, the base station cannot know the activity ratio and all users' large-scale fading coefficients in advance, and it cannot perfectly synchronize with all users in time and frequency. To this end, in this paper, we propose a scheme for performing active user detection and channel estimation without any side information in GF-NOMA under timing offsets. Throughout computer simulations, we demonstrate that the proposed scheme can estimate the channels with comparable accuracy as the conventional one and accurately perform active user detection. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Grant-free access / timing offset / approximate message passing / EM algorithm |
| Paper # | RCS2023-18 |
| Date of Issue | 2023-05-18 (RCS) |
| Conference Information | |
| Committee | RCS / IN |
|---|---|
| Conference Date | 2023/5/25(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Keio University (Hiyoshi Campus), and online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Ad-Hoc/Sensor Networks/MANET, Mobile Networks, M2M/IoT Communications, Wi-Fi, IEEE802.15(ZigBee) and others |
| Chair | Kenichi Higuchi(Tokyo Univ. of Science) / Kunio Hato(Internet Multifeed) |
| Vice Chair | Tomoya Tandai(Toshiba) / Fumihide Kojima(NICT) / Osamu Muta(Kyushu Univ.) / Tsutomu Murase(Nagoya Univ.) |
| Secretary | Tomoya Tandai(Panasonic) / Fumihide Kojima(Univ. of Electro-Comm) / Osamu Muta(Sharp) / Tsutomu Murase(KDDI Research) |
| Assistant | Manabu Sakai(Mitsubishi Electric) / Masashi Iwabuchi(NTT) / Issei Kanno(KDDI Research) / Yuyuan Chang(Tokyo Inst. of Tech) / Kazuki Maruta(Tokyo Univ. of Science) |
| Paper Information | |
| Registration To | Technical Committee on Radio Communication Systems / Technical Committee on Information Networks |
|---|---|
| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Blind Active User Detection for Grant-Free Access in the Presence of Timing Offsets |
| Sub Title (in English) | |
| Keyword(1) | Grant-free access |
| Keyword(2) | timing offset |
| Keyword(3) | approximate message passing |
| Keyword(4) | EM algorithm |
| 1st Author's Name | Takanori Hara |
| 1st Author's Affiliation | Tokyo University of Science(Tokyo Univ. of Science) |
| Date | 2023-05-25 |
| Paper # | RCS2023-18 |
| Volume (vol) | vol.123 |
| Number (no) | RCS-52 |
| Page | pp.pp.23-28(RCS), |
| #Pages | 6 |
| Date of Issue | 2023-05-18 (RCS) |