Journal of Communications and Networks

  • 제12권3호
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  • Pages.216-221
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  • 2010
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  • 1229-2370(pISSN)
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  • 1976-5541(eISSN)
한국통신학회 (The Korean Institute of Commucations and Information Sciences)
권호 표지

A Novel Subspace Tracking Algorithm and Its Application to Blind Multiuser Detection in Cellular CDMA Systems

  • Ali, Imran (Center for Advance Studies in Telecommunication, COMSATS Institute of Information Technology) ;
  • Kim, Doug-Nyun (Digital Communication Lab., Myongji University) ;
  • Song, Yun-Jeong (Next Mobile Broadcasting Technology Research Team, ETRI) ;
  • Azeemi, Naeem Zafar (Center for Advance Studies in Telecommunication, COMSATS Institute of Information Technology)
  • 투고 : 2008.06.24
  • 심사 : 2010.01.21
  • 발행 : 2010.06.30
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초록

In this paper, we propose and develop a new algorithm for the principle subspace tracking by orthonormalizing the eigenvectors using an approximation of Gram-Schmidt procedure. We carry out a novel mathematical derivation to show that when this approximated version of Gram-Schmidt procedure is added to a modified form of projection approximation subspace tracking deflation (PASTd) algorithm, the eigenvectors can be orthonormalized within a linear computational complexity. While the PASTd algorithm tries to extracts orthonormalized eigenvectors, the new scheme orthonormalizes the eigenvectors after their extraction, yielding much more tacking efficiency. We apply the new tracking scheme for blind adaptive multiuser detection for non-stationary cellular CDMA environment and use extensive simulation results to demonstrate the performance improvement of the proposed scheme.

키워드

참고문헌

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