Iterative Turbo MMSE Successive Parallel Arbitrated Decision Feedback Detectors for DS-CDMA Systems

Author

de Lamare, R.C. ; Sampaio-Neto, R.

Author_Institution

Univ. of York, York

fYear

2008

fDate

March 31 2008-April 3 2008

Firstpage

397

Lastpage

402

Abstract

In this paper we propose iterative turbo minimum mean squared error (MMSE) successive parallel arbitrated decision feedback (DF) receivers for direct sequence code division multiple access (DS-CDMA) systems. We describe the MMSE design criterion for DF multiuser detectors along with successive, parallel and iterative interference cancellation structures. A novel efficient turbo DF structure that employs soft-decision successive cancellation with parallel arbitrated branches and a near-optimal low complexity user ordering algorithm are presented. The proposed iterative turbo DF receiver structure and the ordering algorithm are then combined with iterative cascaded DF stages for mitigating the deleterious effects of error propagation for uncoded systems. Simulations for an uplink scenario show substantial gains for the proposed iterative turbo DF detectors over the best known methods.

Keywords

automatic repeat request; code division multiple access; interference suppression; iterative decoding; least mean squares methods; multiuser detection; turbo codes; DF multiuser detector; DS-CDMA system; direct sequence code division multiple access system; iterative turbo MMSE successive parallel arbitrated decision feedback detector; minimum mean squared error; soft-decision successive interference cancellation; AWGN channels; Communications Society; Detectors; Feedback; Interference cancellation; Interference suppression; Iterative algorithms; Matched filters; Multiaccess communication; Peer to peer computing;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications and Networking Conference, 2008. WCNC 2008. IEEE

Conference_Location

Las Vegas, NV

ISSN

1525-3511

Print_ISBN

978-1-4244-1997-5

Type

conf

DOI

10.1109/WCNC.2008.75

Filename

4489106