2003 Fiscal Year Final Research Report Summary
Doppler Spreading Compensation Technique for Mobile Communications based on Space-Domain Interpolated Array Antenna
| Project/Area Number |
13450160
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
情報通信工学
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| Research Institution | Nara Institute of Science and Technology |
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Principal Investigator |
YAMAMOTO Heiichi Nara Institute of Science and Technology, Graduate School of Information Science, Professor, 情報科学研究科, 教授 (40243357)
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| Co-Investigator(Kenkyū-buntansha) |
SAITO Masato Nara Institute of Science and Technology, Graduate School of Information Science, Assistant, 情報科学研究科, 助手 (30335476)
CHINEN Ken'ichi Japan Institute of Science and Technology, Graduate School of Information Science, Associate, 情報科学研究科, 助手 (20304157)
OKADA Minoru Nara Institute of Science and Technology, Graduate School of Information Science, Associate, 情報科学研究科, 助教授 (10252587)
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| Project Period (FY) |
2001 – 2003
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| Keywords | OFDM / Orthogonal Frequency Division Multiplex / Doppler Spreading / Array Antenna / Space-Domain Interpolation / Digital Terrestrial Television Broadcasting / Fourth-Generation Mobile Communications / Multipath Fading |
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| Research Abstract |
Television Broadcasting, Wireless LAN (Local Ares Network) and a candidate for the next generation mobile communication systems. Although OFDM is robust to time-dispersive multipath channel, it has a major drawback in degradation due to Doppler spreading. In order to solve the Doppler spreading problem, this study proposes an array antenna assisted Doppler spread compensator based on space-domain interpolation. Since the proposed compensator estimates the received signal at the stationary point with respect to the ground, it eliminates the Doppler shift phenomenon during the symbol period. Although this compensation method is effective, it has some problems in implementing it onto cars and trains where the size and shape are strictly limitted. In order to solve the implementation issues, this study first proposes the new array antenna structure which can be attached on the side window of the vehicle. Then this research proposes a new algorithm for estimating the vehicle speed accrate enough for compensating for the Doppler spread. It also proposes a mutual coupling canceller for our array antenna. In our array antenna for Doppler spread compensator, the spacing amongst elements is much narrower than the conventional one. In this case, mutual coupling amangst element affects the performance of the compensator. Our mutual coupling canceller automatically measures the mutual impedance amongst elements and cancels it. Finally, this work proposes a joint diversity and Doppler spread compensator by making efficient use of array antenna. The proposed joint diversity and Doppler spread compensator drastically improves the bit error rate performance in high mobility mobile commujncation systems.
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