New approximate QR-LS algorithms for minimum output energy (MOE) receivers in DS-CDMA communication systems

Author

Cheng, H. ; Zhou, Y. ; Chan, S.C.

Author_Institution

Dept. of Electr. & Electron. Eng., Hong Kong Univ., China

fYear

2005

fDate

23-26 May 2005

Firstpage

2631

Abstract

This paper proposes a new family of approximate QR-based least-squares (LS) adaptive algorithms called p-A-QR-LS for blind minimum output energy (MOE) detection in CDMA communications systems. It extends the A-QR-LS algorithm by retaining different numbers of diagonal plus p - 1 off-diagonals of the triangular factor of the augmented data matrix. For p = 1 and N (N is the length of the weighting vector), it reduces to the A-QR-LS and the QR-RLS algorithms, respectively. It not only provides a link between the QR-LMS-type and the QR-RLS algorithms through a well-structured family of algorithms, but also offers more freedom in the complexity-performance tradeoffs for practical receiver design in communication systems. The performance of the proposed algorithm is verified by computer simulations.

Keywords

adaptive signal processing; code division multiple access; least squares approximations; spread spectrum communication; DS-CDMA communication systems; MOE receivers; approximate QR-LS algorithms; augmented data matrix; blind minimum output energy; complexity-performance tradeoffs; least-squares adaptive algorithms; p-A-QR-LS; Adaptive algorithm; Adaptive filters; Detectors; Filtering algorithms; Least squares approximation; Matrix decomposition; Multiaccess communication; Multiple access interference; Power engineering and energy; Resonance light scattering;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2005. ISCAS 2005. IEEE International Symposium on

Print_ISBN

0-7803-8834-8

Type

conf

DOI

10.1109/ISCAS.2005.1465166

Filename

1465166