| Presentation | 2020-01-24 Active User Detection for Uplink Grant-Free Non-Orthogonal Multiple Access in The Presence of Carrier Frequency Offsets Takanori Hara, Koji Ishibashi, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Practically, it is significantly difficult to assume that carrier frequencies are ideally synchronized among users, and these offsets cause the severe degradation of the performance of active user detection (AUD). Conventional method performs the AUD effectively even in the presence of carrier frequency offset (CFO) utilizing Taylor approximation and block coordinate descent method. However, this method requires the maximal number of active users as a prior information while this assumption is not reasonable for grant-free access in which users transmit autonomously. Besides, since the performance degrades as the number of potential users increases, this conventional scheme is not appropriate to accommodate massive users which is a main target of grant-free access. In this paper, we propose new AUD, which does not need any a prior information unlike the conventional scheme. Our proposal utilizes coordinate descent method and a peek estimation method for angle-of-arrival. Computer simulations confirm the proposed scheme can estimate the active users accurately. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Grant-free non-orthogonal multiple access / active user detection / carrier frequency offset / coordinate descent method |
| Paper # | IT2019-89,SIP2019-102,RCS2019-319 |
| Date of Issue | 2020-01-16 (IT, SIP, RCS) |
| Conference Information | |
| Committee | IT / SIP / RCS |
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| Conference Date | 2020/1/23(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Hiroshima City Youth Center |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Jun Muramatsu(NTT) / Naoyuki Aikawa(TUS) / Tomoaki Otsuki(Keio Univ.) |
| Vice Chair | Tadashi Wadayama(Nagoya Inst. of Tech.) / Kazunori Hayashi(Osaka City Univ) / Yukihiro Bandou(NTT) / Satoshi Suyama(NTT DoCoMo) / Fumiaki Maehara(Waseda Univ.) / Toshihiko Nishimura(Hokkaido Univ.) |
| Secretary | Tadashi Wadayama(Saga Univ.) / Kazunori Hayashi(Nagano Pref Inst. of Tech.) / Yukihiro Bandou(Hiroshima Univ.) / Satoshi Suyama(Hosei Univ.) / Fumiaki Maehara(NTT) / Toshihiko Nishimura(Kyushu Univ.) |
| Assistant | Hideki Yagi(UEC) / Kenjiro Sugimoto(Waseda Univ.) / Kazushi Muraoka(NEC) / Shinsuke Ibi(Doshisha Univ.) / Koichi Adachi(Univ. of Electro-Comm.) / Osamu Nakamura(Sharp) / Manabu Sakai(Mitsubishi Electric) |
| Paper Information | |
| Registration To | Technical Committee on Information Theory / Technical Committee on Signal Processing / Technical Committee on Radio Communication Systems |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Active User Detection for Uplink Grant-Free Non-Orthogonal Multiple Access in The Presence of Carrier Frequency Offsets |
| Sub Title (in English) | |
| Keyword(1) | Grant-free non-orthogonal multiple access |
| Keyword(2) | active user detection |
| Keyword(3) | carrier frequency offset |
| Keyword(4) | coordinate descent method |
| 1st Author's Name | Takanori Hara |
| 1st Author's Affiliation | The University of Electro-Communications(The Univ. of Electro-Communications) |
| 2nd Author's Name | Koji Ishibashi |
| 2nd Author's Affiliation | The University of Electro-Communications(The Univ. of Electro-Communications) |
| Date | 2020-01-24 |
| Paper # | IT2019-89,SIP2019-102,RCS2019-319 |
| Volume (vol) | vol.119 |
| Number (no) | IT-376,SIP-377,RCS-378 |
| Page | pp.pp.313-317(IT), pp.313-317(SIP), pp.313-317(RCS), |
| #Pages | 5 |
| Date of Issue | 2020-01-16 (IT, SIP, RCS) |