An adaptive WPE multiuser detector

Author

Li, Zhongjie ; Ser, Wee

Author_Institution

Centre for Signal Process. Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore

Volume

12

Issue

4

fYear

2005

fDate

4/1/2005 12:00:00 AM

Firstpage

305

Lastpage

308

Abstract

Weighted polynomial expansion (WPE) detectors can be used to approximate linear multiuser detectors to avoid the need to compute matrix inversion. For finite stage WPE detectors, weight vector optimization is an important process since it determines how effective the linear multiuser detectors can be approximated. In this letter, the optimal weight vector for the finite stage WPE detector is derived based on the mean-squared error (MSE) criteria. In addition, a low-complexity adaptive WPE detector based on the least-squares criteria is proposed to simplify the computation of the optimum weight vector. Simulation results show that the proposed adaptive WPE detector outperforms the existing WPE method.

Keywords

code division multiple access; least mean squares methods; multiuser detection; optimisation; polynomial approximation; MSE; adaptive WPE detector; least-squares criteria; linear multiuser detector; mean-squared error; weight vector optimization; weighted polynomial expansion; Binary phase shift keying; Decorrelation; Detectors; Multiaccess communication; Multiple access interference; Multiuser detection; Performance loss; Polynomials; Signal processing; Vectors; Least-squares criteria; mean-squared error criteria; multiuser detector; weighted polynomial expansion (WPE) detector;

fLanguage

English

Journal_Title

Signal Processing Letters, IEEE

Publisher

ieee

ISSN

1070-9908

Type

jour

DOI

10.1109/LSP.2005.843780

Filename

1407926