| Presentation | 2018-02-22 A Novel AFC Scheme for WHCDM Based on Inter-Code Interference Due to Carrier Frequency Offset Yuki Kanamaru, 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 and time-varying Doppler shift caused by the helicopter maneuvers are important problems to be solved. Code division multiplexing (CDM) employing Walsh-Hadamard code (WHCDM) is suitable for overcoming the periodic blockage. However, in WHCDM systems, the carrier frequency offset due to Doppler shift causes the inter-code interference (ICI), which degrades the bit error rate (BER) performance. WHCDM systems therefore require an accurate automatic frequency control (AFC) scheme. In this report, we propose a novel AFC scheme based on the ICI. The proposed scheme detects the carrier frequency offset using the energy variance of the demultiplexed signal. Results of computer simulation show that the proposed scheme performs well even in the low carrier-to-noise power ratio (CNR) environment where the conventional one fails to track the time-varying carrier frequency offset. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Helicopter satellite communications / Doppler shift / AFC / Periodic channel blockage / WHCDM |
| Paper # | SAT2017-58 |
| 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 Novel AFC Scheme for WHCDM Based on Inter-Code Interference Due to Carrier Frequency Offset |
| Sub Title (in English) | |
| Keyword(1) | Helicopter satellite communications |
| Keyword(2) | Doppler shift |
| Keyword(3) | AFC |
| Keyword(4) | Periodic channel blockage |
| Keyword(5) | WHCDM |
| 1st Author's Name | Yuki Kanamaru |
| 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 # | SAT2017-58 |
| Volume (vol) | vol.117 |
| Number (no) | SAT-446 |
| Page | pp.pp.13-18(SAT), |
| #Pages | 6 |
| Date of Issue | 2018-02-15 (SAT) |