A Low Complexity RLS-PASTd Algorithm for Blind Multiuser Detection in Dispersive CDMA Channels

Author

Ding, Zi-Zhe ; Zhang, Xian-Da ; Zhu, Xiao-Long

Author_Institution

Dept. of Autom., Tsinghua Univ., Beijing

Volume

6

Issue

4

fYear

2007

fDate

4/1/2007 12:00:00 AM

Firstpage

1187

Lastpage

1192

Abstract

For joint blind channel estimation and multiuser detection in direct-sequence code division multiple access (DS-CDMA) systems, a combined scheme is proposed, which couples the recursive least-squares (RLS) adaptations and the PASTd subspace tracking algorithm. A major advantage of the RLS-PASTd algorithm is that it admits an adaptive implementation with low computational complexity instead of singular value decomposition. Simulation results demonstrate the fast tracking capability and high steady-state estimation accuracy of the proposed algorithm in both the time-invariant and time-variant environments

Keywords

channel estimation; code division multiple access; least squares approximations; multiuser detection; spread spectrum communication; RLS-PASTd algorithm; blind channel estimation; blind multiuser detection; direct-sequence code division multiple access; dispersive CDMA channels; recursive least-squares; steady-state estimation; subspace tracking algorithm; time-invariant environments; Channel estimation; Computational complexity; Detectors; Dispersion; Fading; Multiaccess communication; Multiple access interference; Multiuser detection; Resonance light scattering; Singular value decomposition;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2007.348311

Filename

4155654