Iterative multi-user algorithm for convolutionally coded asynchronous DS-CDMA systems: turbo-CDMA

Author

Roumy, Aline ; Fijalkow, Inbar ; Pire, Didier ; Duvaut, Patrick

Author_Institution

Equipe de Traitement des Images et du Signal, ENSEA, Cergy, France

Volume

5

fYear

2000

fDate

2000

Firstpage

2893

Abstract

A low-complexity and iterative receiver is proposed for the CDMA uplink, consisting of a low-complexity equalizer and single-user decoders. Iterations are used to feed the equalizer with more reliable data, which improves performance. This receiver called turbo-CDMA is aimed to eliminate MUI almost completely in the presence of multipath and to be robust to the near-far effect. Simulation results show that the performance approaches single-user performance at moderate and also low signal-to-noise ratios, even for a severe distortion channel

Keywords

code division multiple access; convolutional codes; decoding; equalisers; interference suppression; iterative methods; land mobile radio; multipath channels; multiuser channels; radio links; radio receivers; radiofrequency interference; spread spectrum communication; turbo codes; CDMA uplink; SNR; convolutionally coded asynchronous DS-CDMA systems; iterative multi-user algorithm; iterative receiver; low signal-to-noise ratios; low-complexity equalizer; low-complexity receiver; multipath; multiuser interference suppression; near-far effect; simulation results; single-user decoders; single-user performance; turbo-CDMA; Convolution; Convolutional codes; Distortion; Equalizers; Feeds; Iterative algorithms; Iterative decoding; Multiaccess communication; Robustness; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2000. ICASSP '00. Proceedings. 2000 IEEE International Conference on

Conference_Location

Istanbul

ISSN

1520-6149

Print_ISBN

0-7803-6293-4

Type

conf

DOI

10.1109/ICASSP.2000.861136

Filename

861136