Mitigating error propagation in decision-feedback equalization for multiuser CDMA

Author

Tian, Zhi

Author_Institution

Dept. of Electr. & Comput. Eng., Michigan Technol. Univ., Houghton, MI, USA

Volume

52

Issue

4

fYear

2004

fDate

4/1/2004 12:00:00 AM

Firstpage

525

Lastpage

529

Abstract

This letter presents a robust decision-feedback equalization design that mitigates the error-propagation problem for multiuser direct-sequence code-division multiple-access systems under multipath fading. Explicit constraints for signal energy preservation are imposed on the filter weight vector to monitor and maintain the quality of the hard decisions in the nonlinear feedback loop. Such a measure protects the desired signal power against the detrimental effect of erroneous past decisions, thus providing the leverage to curb error propagation.

Keywords

code division multiple access; fading channels; feedback; least squares approximations; multipath channels; multiuser detection; recursive estimation; spread spectrum communication; decision-feedback equalization; direct sequence code division multiple access; error propagation problem; filter weight vector; multipath fading; multiuser DS-CDMA; nonlinear feedback loop; recursive least square; Decision feedback equalizers; Fading; Feedback loop; Filters; Intersymbol interference; Monitoring; Multiaccess communication; Noise cancellation; Resonance light scattering; Robustness;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/TCOMM.2004.826357

Filename

1291789