Presentation | 2004/10/15 A Class of Multiuser Interference Free Modulations Produced by General Orthogonal Modulations(Advanced Technology)(Joint Conference on Satellite Communications 2004(JC-SAT 2004)) Takashi YASUNAGA, Ikuo OKA, Shingo ATA, Chikato Fujiwara, |
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Abstract(in Japanese) | (See Japanese page) |
Abstract(in English) | Suppression of multiuser interference effects in a frequency-selective fading channel is a big issue in mobile communication systems. In this paper, a parameter of modulations is discussed to develop new modulations which do not yield multiuser interference in CDMA. The modulations are shown to be in a certain class of general orthogonal modulations. The general orthogonal modulations are based on orthogonal vectors, which are obtained by multidimensional rotations and have parameters of rotation planes and rotation angles. We find the parameters of general orthogonal modulations that preserves orthogonality among users in the frequency-selective channel. The derived parameters express the new modulations, whose transfer matrices are expressed by a Kronecker product of two rotation matrices. We obtain the parameters that maximize the minimum constellation distance by computer simulations. Numerical results of distance are demonstrated to compare the performance of widely used CDMA and the new modulations proposed in this paper. |
Keyword(in Japanese) | (See Japanese page) |
Keyword(in English) | General Orthogonal Modulation / Frequency-Selective Channel / Multiuser Interference / Multidimensional Rotation |
Paper # | SAT2004-144 |
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Committee | SAT |
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Conference Date | 2004/10/15(1days) |
Place (in Japanese) | (See Japanese page) |
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Topics (in Japanese) | (See Japanese page) |
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Paper Information | |
Registration To | Satellite Telecommunications (SAT) |
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Language | ENG |
Title (in Japanese) | (See Japanese page) |
Sub Title (in Japanese) | (See Japanese page) |
Title (in English) | A Class of Multiuser Interference Free Modulations Produced by General Orthogonal Modulations(Advanced Technology)(Joint Conference on Satellite Communications 2004(JC-SAT 2004)) |
Sub Title (in English) | |
Keyword(1) | General Orthogonal Modulation |
Keyword(2) | Frequency-Selective Channel |
Keyword(3) | Multiuser Interference |
Keyword(4) | Multidimensional Rotation |
1st Author's Name | Takashi YASUNAGA |
1st Author's Affiliation | Graduate School of Engineering, Osaka City University() |
2nd Author's Name | Ikuo OKA |
2nd Author's Affiliation | Graduate School of Engineering, Osaka City University |
3rd Author's Name | Shingo ATA |
3rd Author's Affiliation | Graduate School of Engineering, Osaka City University |
4th Author's Name | Chikato Fujiwara |
4th Author's Affiliation | Faculty of Modern Management Information, Osaka Seikei University |
Date | 2004/10/15 |
Paper # | SAT2004-144 |
Volume (vol) | vol.104 |
Number (no) | 352 |
Page | pp.pp.- |
#Pages | 4 |
Date of Issue |