A novel iterative multiuser detector for complex modulation schemes

Author

Lampe, Alexander ; Schober, Robert ; Gerstacker, Wolfgang ; Huber, Johannes

Author_Institution

Lehrstuhl fur Informationsubertragung, Erlangen-Nurnberg Univ., Erlangen, Germany

Volume

20

Issue

2

fYear

2002

fDate

2/1/2002 12:00:00 AM

Firstpage

339

Lastpage

350

Abstract

A novel multiuser detector for direct sequence code division multiple access is proposed. The receiver performs iterated soft decision interference cancellation (ISDIC) based on multiuser interference suppression filters designed for minimization of the mean-square error. Assuming a complex modulation format, we show that the multiuser interference becomes rotationally variant in the course of the iterations. Regarding this rotational variance in the design of the multiuser interference suppression filter, the presented iterative multiuser detector achieves significant performance gains compared with conventional ISDIC employing a standard minimum mean-squared error filter which is optimum only for rotationally invariant multiuser interference

Keywords

code division multiple access; filtering theory; interference suppression; iterative methods; least mean squares methods; modulation; multiuser channels; radio receivers; radiofrequency interference; signal detection; spread spectrum communication; MSE minimization; complex modulation schemes; direct sequence code division multiple access; iterated soft decision interference cancellation; iterative multiuser detector; mean-square error minimization; minimum mean-squared error filter; multiuser interference suppression filters; receiver; rotationally invariant multiuser interference; Additive noise; Covariance matrix; Detectors; Direct-sequence code-division multiple access; Interference cancellation; Interference suppression; Matched filters; Modulation coding; Multiaccess communication; Nonlinear filters;

fLanguage

English

Journal_Title

Selected Areas in Communications, IEEE Journal on

Publisher

ieee

ISSN

0733-8716

Type

jour

DOI

10.1109/49.983351

Filename

983351