| Presentation | 2021-06-24 A Transmission Efficiency Improvement Scheme for Software Acoustic MODEMs of Differential OFDM Koki Toyoda, Hiroshi Kubo, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | This paper discusses differential orthogonal frequency division multiplexing (DOFDM) software modems for underwater acoustic communications (UWAC) in severe doubly selective channel environment and their information transmission efficiency improvement scheme. DOFDM is a good solution for doubly selective channels, because OFDM is good for frequency selectivity and differential encoding/differential detection are good for time selectivity. However, in order to realize a DOFDM modem, it is necessary to insert synchronization words (SW) between frames. As a result, information transmission efficiency decreases. This paper evaluates subcarrier phase offset (SPO) scheme that prevents a decrease in the information transmission efficiency of a DOFDM modem by giving a phase rotation equivalent to the Zadoff-Chu (ZC) sequence for each subcarrier. This paper discusses the hardware and software configuration of the DOFDM software modem. Next, the effectiveness of the DOFDM software modem is clarified by computer simulation and experimental results. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Doubly Selective Channel / Underwater Acoustic Communications / Differential Orthogonal Frequency Division Multiplexing / Software Modem / Synchronization Words |
| Paper # | RCS2021-57 |
| Date of Issue | 2021-06-16 (RCS) |
| Conference Information | |
| Committee | RCS |
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| Conference Date | 2021/6/23(3days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | First Presentation in IEICE Technical Committee, Resource Control, Scheduling, Wireless Communications, etc. |
| Chair | Eiji Okamoto(Nagoya Inst. of Tech.) |
| Vice Chair | Fumihide Kojima(NICT) / Toshihiko Nishimura(Hokkaido Univ.) / Tomoya Tandai(Toshiba) |
| Secretary | Fumihide Kojima(Panasonic) / Toshihiko Nishimura(NEC) / Tomoya Tandai |
| Assistant | Koichi Adachi(Univ. of Electro-Comm.) / Osamu Nakamura(Sharp) / Manabu Sakai(Mitsubishi Electric) / Masashi Iwabuchi(NTT) / Tatsuki Okuyama(NTT DOCOMO) |
| Paper Information | |
| Registration To | 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) | A Transmission Efficiency Improvement Scheme for Software Acoustic MODEMs of Differential OFDM |
| Sub Title (in English) | |
| Keyword(1) | Doubly Selective Channel |
| Keyword(2) | Underwater Acoustic Communications |
| Keyword(3) | Differential Orthogonal Frequency Division Multiplexing |
| Keyword(4) | Software Modem |
| Keyword(5) | Synchronization Words |
| 1st Author's Name | Koki Toyoda |
| 1st Author's Affiliation | Ritsumeikan University(Ritsumeikan Univ.) |
| 2nd Author's Name | Hiroshi Kubo |
| 2nd Author's Affiliation | Ritsumeikan University(Ritsumeikan Univ.) |
| Date | 2021-06-24 |
| Paper # | RCS2021-57 |
| Volume (vol) | vol.121 |
| Number (no) | RCS-72 |
| Page | pp.pp.169-174(RCS), |
| #Pages | 6 |
| Date of Issue | 2021-06-16 (RCS) |