| Project/Area Number |
10044142
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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 | Yokohama National University |
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Principal Investigator |
KOHNO Ryuji Yokohama National University, Faculty of Engineering, Professor, 工学部, 教授 (90170208)
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| Co-Investigator(Kenkyū-buntansha) |
河野 隆二 横浜国立大学, 工学部, 教授 (90170208)
BAIRE Paul W ドイツーKaierslautern大学, 無線通信研究所・教授, 理事
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥5,900,000 (Direct Cost: ¥5,900,000)
Fiscal Year 1999: ¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1998: ¥3,200,000 (Direct Cost: ¥3,200,000)
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| Keywords | Mobile Communications / Multimedia Communications / Adaptive Array Antenna / CDMA / Spread Spectrum Communications / Spatial and Temporal Signal Processing / Interference Rejection |
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| Research Abstract |
The aim of this study is to international cooperation between Japan and Europe in fields of adaptive array antennas and CDMA (Code Division Multiple Access) based on spread spectrum technique in order to provide extremely useful countermeasures to overcome a lack of frequency spectrum due to rapid increase of demands in wireless communications such as mobile communications. For instance, in a CDMA technique, (1) The way of leading the optimization criterion of the communication quality evaluation of the multimedia and modeling the wireless communication channel, (2) Proposal of a method of measuting traffic variance of multimedia CDMA wireless communication systems and a method of adaptive controlling the processing gain and transmission power for individual media, (3) Proposal of the signal processing in space and time domains based on adaptive digital filter and adaptive array antenna for rejection to narrow band interference and fading. Second, in a array antenna, (1) Modeling of time-varying multipath fading channel in space and time domains, (2) Analysis of improvement of frequency efficiency based on application of adaptive array antennas, (3) Proposal and analysis of space and time optimum equalizer, receiver, channel coding and decoding, (4) Proposal and evaluation of adaptive array antenna architectures and adaptive algorithms, (5) Application and performance analysis to CDMA environment.
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