| Presentation | 2021-03-03 Non-Orthogonal Multiple Access that allocates subcarriers based on factor graphs Taichi Yamagami, Satoshi Denno, Ahi Ko, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In this paper, we propose a non-orthogonal multiple access in the frequency domain. In the proposed method, multiple users are assigned to each subcarrier orthogonal to each other in the frequency domain, and signals are superimposed to perform overload transmission with a number of users exceeding the number of subcarriers. On the receiver side, each user signal is separated from the superimposed signal by performing MPA (Message Passing Algorithm). we also propose a characteristic improvement method by adaptively allocating user subcarriers in non-orthogonal multiple access in this frequency domain. In the proposed method, the optimum pattern is selected in advance from all the patterns of subcarrier allocation to users. we consider a method of selecting subcarrier allocation based on the LLR (Log-Likelihood Ratio) value calculated from the user's channel information. This proposed method shows an improvement in the characteristics of about $2[mathrm{dB}]$ at the $10^{-3}$ point of BER (Bit Error Rate) compared to the method of fixing the subcarrier allocation. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Non-Orthogonal Multiple Access / Factor graphs / LLR(Log-Likelihood Ratio) / MPA(Message Passing Algorithm) |
| Paper # | SRW2020-52 |
| Date of Issue | 2021-02-24 (SRW) |
| Conference Information | |
| Committee | RCS / SR / SRW |
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| Conference Date | 2021/3/3(3days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Mobile Communication Workshop |
| Chair | Eiji Okamoto(Nagoya Inst. of Tech.) / Masayuki Ariyoshi(NEC) / Satoshi Denno(Okayama Univ.) |
| Vice Chair | Fumiaki Maehara(Waseda Univ.) / Toshihiko Nishimura(Hokkaido Univ.) / Tomoya Tandai(Toshiba) / Suguru Kameda(Tohoku Univ.) / Osamu Takyu(Shinshu Univ.) / Kentaro Ishidu(NICT) / Keiichi Mizutani(Kyoto Univ.) / Kentaro Saito(Tokyo Inst. of Tech.) / Hanako Noda(Anritsu) |
| Secretary | Fumiaki Maehara(Kyushu Univ.) / Toshihiko Nishimura(NEC) / Tomoya Tandai(ATR) / Suguru Kameda(Univ. of Electro-Comm.) / Osamu Takyu(Mie Univ.) / Kentaro Ishidu(NTT) / Keiichi Mizutani(NIigata Univ.) / Kentaro Saito / Hanako Noda |
| Assistant | Koichi Adachi(Univ. of Electro-Comm.) / Osamu Nakamura(Sharp) / Manabu Sakai(Mitsubishi Electric) / Masashi Iwabuchi(NTT) / Tatsuki Okuyama(NTT DOCOMO) / Mai Ohta(Fukuoka Univ.) / Teppei Oyama(Fujitsu Lab.) / Kentaro Kobayashi(Nagoya Univ.) / Masaaki Fuse(Anritsu) / Akihito Noda(Nanzan Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Radio Communication Systems / Technical Committee on Smart Radio / Technical Committee on Short Range Wireless Communications |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Non-Orthogonal Multiple Access that allocates subcarriers based on factor graphs |
| Sub Title (in English) | |
| Keyword(1) | Non-Orthogonal Multiple Access |
| Keyword(2) | Factor graphs |
| Keyword(3) | LLR(Log-Likelihood Ratio) |
| Keyword(4) | MPA(Message Passing Algorithm) |
| 1st Author's Name | Taichi Yamagami |
| 1st Author's Affiliation | Okayama University(Okayama Univ.) |
| 2nd Author's Name | Satoshi Denno |
| 2nd Author's Affiliation | Okayama University(Okayama Univ.) |
| 3rd Author's Name | Ahi Ko |
| 3rd Author's Affiliation | Okayama University(Okayama Univ.) |
| Date | 2021-03-03 |
| Paper # | SRW2020-52 |
| Volume (vol) | vol.120 |
| Number (no) | SRW-406 |
| Page | pp.pp.7-13(SRW), |
| #Pages | 7 |
| Date of Issue | 2021-02-24 (SRW) |