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 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
Conference Date 2004/10/15(1days)
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Registration To Satellite Telecommunications (SAT)
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