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A Class of Multiuser Interference Free Modulations Produced by General Orthogonal Modulations
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  • A Class of Multiuser Interference Free Modulations Produced by General Orthogonal Modulations
  • A Class of Multiuser Interference Free Modulations Produced by General Orthogonal Modulations
저자명
Yasunaga. Takashi,Oka. Ikuo,Ata. Shingo,Fujiwara. Chikato
간행물명
Joint Conference on Satellite Communications
권/호정보
2004년|2004권 1호|pp.185-188 (4 pages)
발행정보
통신위성우주산업연구회
파일정보
정기간행물|ENG|
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기타
이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
서지반출

기타언어초록

Suppression of multiuser interference effects in a frequency-selective fading channel is big issue in mobile communication system. 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 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.