| Presentation | 2020-08-21 Basic characteristics of Differential OFDM Employing Decision-Feedback Multiple Differential Detection with Channel Prediction Hiroaki Osafune, Hiroshi Kubo, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | OFDM (orthogonal frequency division multiplexing) is discussed as effective system for frequency selectivity. However, if severe Doppler shift occurs, OFDM cannot send data due to its frequent pilot insertion. Also, differential detection is effective for time selectivity, however it cannot detect accurate phase difference in severe Doppler shift.This paper proposes differential OFDM employing DFMDD (decision-feedback multiple differential detection) with channel prediction which is effective for severe time selectivity and frequency selectivity.Differential OFDM does not need pilot signal for channel estimation, and DFMDD with channel prediction can reduce computational complexity, keeping good tracking capability for Doppler shift.Also, since the trackability and reception sensitivity of the proposed schemes are determined by the value of the maximum differential symbol number $N$ of observed received symbols of DFMDD, it is necessary to evaluate the optimum $N$.In this paper, the optimum $N$ of the proposed schemes is confirmed by computer simulation in the channels of underwater acoustic communications as doubly-selective environment. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Doubly Selective Channels / Decision-Feedback Multiple Differential Detection / Differential OFDM |
| Paper # | RCS2020-90 |
| Date of Issue | 2020-08-13 (RCS) |
| Conference Information | |
| Committee | SAT / RCS |
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| Conference Date | 2020/8/20(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Hisashi Sujikai(NHK) / Eiji Okamoto(Nagoya Inst. of Tech.) |
| Vice Chair | Hiroyasu Ishikawa(Nihon Univ.) / Tetsushi Ikegami(Meiji Univ.) / Fumiaki Maehara(Waseda Univ.) / Toshihiko Nishimura(Hokkaido Univ.) / Tomoya Tandai(Toshiba) |
| Secretary | Hiroyasu Ishikawa(NHK) / Tetsushi Ikegami(KDDI Research) / Fumiaki Maehara(Kyushu Univ.) / Toshihiko Nishimura(NEC) / Tomoya Tandai |
| Assistant | Takuya Okura(NICT) / Daisuke Goto(NTT) / 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 Satellite Telecommunications / 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) | Basic characteristics of Differential OFDM Employing Decision-Feedback Multiple Differential Detection with Channel Prediction |
| Sub Title (in English) | |
| Keyword(1) | Doubly Selective Channels |
| Keyword(2) | Decision-Feedback Multiple Differential Detection |
| Keyword(3) | Differential OFDM |
| 1st Author's Name | Hiroaki Osafune |
| 1st Author's Affiliation | Ritsumeikan University(Ritsumeikan Univ.) |
| 2nd Author's Name | Hiroshi Kubo |
| 2nd Author's Affiliation | Ritsumeikan University(Ritsumeikan Univ.) |
| Date | 2020-08-21 |
| Paper # | RCS2020-90 |
| Volume (vol) | vol.120 |
| Number (no) | RCS-130 |
| Page | pp.pp.61-67(RCS), |
| #Pages | 7 |
| Date of Issue | 2020-08-13 (RCS) |