| Presentation | 2018-02-22 A Simplified Initial Acquisition Scheme for WHCDM Based on Distribution Asymmetry of Demultiplexed Signal Energy Yuki Nagashima, Toshiharu Kojima, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | In helicopter satellite communications, the periodic channel blockage due to rotor blades is the most important problem to be solved.Code division multiplexing (CDM) employing Walsh-Hadamard code (WHCDM) is suitable for overcoming the periodic blockage.For the symbol synchronization in WHCDM systems, an initial acquisition scheme using the energy variance of the demultiplexed signal was proposed.However, the signal processing of this conventional scheme is rather complex.In this report, we propose an initial acquisition scheme in order to simplify the signal processing.The proposed scheme acquires the symbol timing using the asymmetry in the energy distribution of the demultiplexed signal.It requires significantly fewer multiplications than the conventional scheme.Results of computer simulation show that the acquisition performance of the proposed scheme is the same or slightly better than that of the conventional one. It is therefore concluded that the proposed scheme drastically reduces the complexity without performance degradation. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Helicopter Satellite Communications / Initial Acquisition / CDM / Walsh-Hadamard Code |
| Paper # | SAT2017-59 |
| Date of Issue | 2018-02-15 (SAT) |
| Conference Information | |
| Committee | SAT / SANE |
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| Conference Date | 2018/2/22(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | The Yamaguchi Chamber of Commerce and Industry |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Satellite Application and General |
| Chair | Toshinori Susuki(Tohoku Gakuin Univ.) / Sonosuke Fukushima(ENRI) |
| Vice Chair | Hiroyuki Tsuji(NICT) / Fumihiro Yamashita(NTT) / Toshifumi Moriyama(Nagasaki Univ.) / Akitsugu Nadai(NICT) |
| Secretary | Hiroyuki Tsuji(KDDI Research Inc.) / Fumihiro Yamashita(NICT) / Toshifumi Moriyama(Mitsubishi Electric) / Akitsugu Nadai(ENRI) |
| Assistant | / Manabu Akita(Univ. of Electro-Comm.) / Ryo Natsuaki(Univ. of Tokyo) |
| Paper Information | |
| Registration To | Technical Committee on Satellite Telecommunications / Technical Committee on Space, Aeronautical and Navigational Electronics |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | A Simplified Initial Acquisition Scheme for WHCDM Based on Distribution Asymmetry of Demultiplexed Signal Energy |
| Sub Title (in English) | |
| Keyword(1) | Helicopter Satellite Communications |
| Keyword(2) | Initial Acquisition |
| Keyword(3) | CDM |
| Keyword(4) | Walsh-Hadamard Code |
| 1st Author's Name | Yuki Nagashima |
| 1st Author's Affiliation | The University of Electro-Communications(UEC) |
| 2nd Author's Name | Toshiharu Kojima |
| 2nd Author's Affiliation | The University of Electro-Communications(UEC) |
| Date | 2018-02-22 |
| Paper # | SAT2017-59 |
| Volume (vol) | vol.117 |
| Number (no) | SAT-446 |
| Page | pp.pp.19-24(SAT), |
| #Pages | 6 |
| Date of Issue | 2018-02-15 (SAT) |