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| Presentation | 2021-06-24 13:40 A Transmission Efficiency Improvement Scheme for Software Acoustic MODEMs of Differential OFDM Koki Toyoda, Hiroshi Kubo (Ritsumeikan Univ.)  RCS2021-57 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (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) |
| (in English) | Doubly Selective Channel / Underwater Acoustic Communications / Differential Orthogonal Frequency Division Multiplexing / Software Modem / Synchronization Words / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 121, no. 72, RCS2021-57, pp. 169-174, June 2021. | |
| Paper # | RCS2021-57 | |
| Date of Issue | 2021-06-16 (RCS) | |
| ISSN | Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | RCS2021-57 |
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| Conference Information | |
| Committee | RCS |
| Conference Date | 2021-06-23 - 2021-06-25 |
| 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. |
| Paper Information | |
| Registration To | RCS |
| Conference Code | 2021-06-RCS |
| Language | Japanese |
| 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 |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 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.) |
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| Speaker | Author-1 |
| Date Time | 2021-06-24 13:40:00 |
| Presentation Time | 10 minutes |
| Registration for | RCS |
| Paper # | RCS2021-57 |
| Volume (vol) | vol.121 |
| Number (no) | no.72 |
| Page | pp.169-174 |
| #Pages | 6 |
| Date of Issue | 2021-06-16 (RCS) |
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