| Presentation | 2022-08-25 Joint Time-Variant Channel Estimation and Signal Detection for Underwater Acoustic MIMO-OFDM Communications Tianhao Dong, Yuyuan Chang, Kazuhiko Fukawa, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In underwater acoustic (UWA) communications, a combination of orthogonal frequency-division multiplexing (OFDM) and multiple-input multiple-output (MIMO) that is called MIMO-OFDM has been investigated: OFDM is robust against frequency selective fading channels and can improve spectral efficiency by orthogonal subcarriers, while MIMO can increase data rate with the same frequency bandwidth and obtain diversity effect. However, the underwater acoustic channel includes propagation paths of which delay time can exceed the guard interval (GI) of OFDM, and of which Doppler frequency can become very high. These paths in the doubly selective fading channel cause both intersymbol interference and intercarrier interference, which can degrade transmission performance of MIMO-OFDM very severely. To alleviate the degradation, this report proposes concatenated structures of diversity combining and replica generation. The diversity combining aims to suppress delayed signal components of which delay time exceeds GI, while the replica generation aims to reproduce delayed signals of which delay time is less than or equal to GI. To track time-variation of the channel, some parameters of the concatenated structures are approximated as basis expansion models (BEMs), and all parameters including coefficients of BEMs can be estimated by the RLS algorithm. Since detected signals can be used for the parameter estimation, joint the decision-directed parameter estimation and signal detection are repeated. Computer simulations show that the proposed receiver can maintain good bit error rate (BER) performance over the underwater doubly-selective channels. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Underwater acoustic (UWA) communications / MIMO / OFDM / parameter estimation / basis expansion model (BEM) / FIR equalization |
| Paper # | RCS2022-103 |
| Date of Issue | 2022-08-18 (RCS) |
| Conference Information | |
| Committee | SAT / RCS |
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| Conference Date | 2022/8/25(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Tetsushi Ikegami(Meiji Univ.) / Kenichi Higuchi(Tokyo Univ. of Science) |
| Vice Chair | Masashi Kamei(NHK) / Takana Kaho(Shonan Inst. of Tech.) / Tomoya Tandai(Toshiba) / Fumihide Kojima(NICT) / Osamu Muta(Kyushu Univ.) |
| Secretary | Masashi Kamei(NTT) / Takana Kaho(NICT) / Tomoya Tandai(Panasonic) / Fumihide Kojima(Univ. of Electro-Comm) / Osamu Muta(Sharp) |
| Assistant | Riichiro Nagareda(KDDI Research) / Yuuki Koizumi(NHK) / Manabu Sakai(Mitsubishi Electric) / Masashi Iwabuchi(NTT) / Issei Kanno(KDDI Research) / Yuyuan Chang(Tokyo Inst. of Tech) |
| Paper Information | |
| Registration To | Technical Committee on Satellite Telecommunications / Technical Committee on Radio Communication Systems |
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| Language | ENG-JTITLE |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Joint Time-Variant Channel Estimation and Signal Detection for Underwater Acoustic MIMO-OFDM Communications |
| Sub Title (in English) | |
| Keyword(1) | Underwater acoustic (UWA) communications |
| Keyword(2) | MIMO |
| Keyword(3) | OFDM |
| Keyword(4) | parameter estimation |
| Keyword(5) | basis expansion model (BEM) |
| Keyword(6) | FIR equalization |
| 1st Author's Name | Tianhao Dong |
| 1st Author's Affiliation | Tokyo Institute of Technology(Tokyo Tech) |
| 2nd Author's Name | Yuyuan Chang |
| 2nd Author's Affiliation | Tokyo Institute of Technology(Tokyo Tech) |
| 3rd Author's Name | Kazuhiko Fukawa |
| 3rd Author's Affiliation | Tokyo Institute of Technology(Tokyo Tech) |
| Date | 2022-08-25 |
| Paper # | RCS2022-103 |
| Volume (vol) | vol.122 |
| Number (no) | RCS-164 |
| Page | pp.pp.36-41(RCS), |
| #Pages | 6 |
| Date of Issue | 2022-08-18 (RCS) |