Development of Multidimensional Orthogonal Systems Adaptive to Channel Conditions
| Project/Area Number |
16560343
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Communication/Network engineering
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| Research Institution | Osaka City University |
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Principal Investigator |
OKA Ikuo Osaka City University, Graduate School of Engineering, Professor, 大学院工学研究科, 教授 (80160646)
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| Co-Investigator(Kenkyū-buntansha) |
WADAYAMA Tadashi Nagoya Institute of Technology, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 准教授 (20275374)
YOSHIKAWA Hideki Tohoku Gakuin University, Faculty of Engineering, Associate Professor, 工学部, 准教授 (60259885)
ATA Shingo Osaka City University, Graduate School of Engineering, Associate Professor, 大学院工学研究科, 准教授 (30326251)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2006: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2005: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2004: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | General orthogonal modulation / Multi-user Interference / Optimal parameter / Euclidean distance / Modulation Classification / Joint moments |
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| Research Abstract |
A General orthogonal modulation is a modulation model, which expresses any orthogonal modulations by the multidimensional rotations. The parameter of the model is a sequence of rotation planes and rotation angles. In this work, multidimensional orthogonal systems have been developed by the general orthogonal modulation for locally optimal modulations with the adaptation to the channel conditions. The results of the work are summarized as follows.
(1) In multiple access systems, the fading destroys a signal orthogonality among users, and causes a serious performance degradation due to a multi-user interference. A class of modulations is proved to have multi-user interference free characteristics even in the fading channel. The parameters of this modulation class are presented with the possible optimization effects against fading.
(2) The new modulation classification method is presented. The method is based on the joint moment of received signal amplitude and phase. The classification error probability is derived in a form of the infinite series of elementary functions, and numerical results of the classification probability for Binary Phase Shift Keying, Quadrature Phase Shift Keying and Quadrature Amplitude Modulation show the superior classification performance. In order to improve the classification performance, the phase shift and the linear transform of amplitude and phase are also proposed.
(3) An orthogonal modulation classification is developed by the general orthogonal modulation. The classification estimates the modulation parameters of rotation planes and angles from the received samples. The samples are divided into signal point clusters. The number of clusters are reduced by rotations to some clusters required to estimate the parameters. Numerical results demonstrate the orthogonal modulation identification, such as QPSK and OFDM.
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Report
(4 results)
Research Products
(31 results)
