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Iterative successive interference cancellation for multi-user DS/CDMA detectors in multipath channels

Suppression itérative d’interférence pour les détecteurs multi-utilisateurs amrc en présence de canaux é trajets multiples

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Abstract

This paper deals with uplink Direct-Sequence Code Division Multiple Access (DS-CDMA) transmissions over mobile radio channels. A new interference cancellation scheme for multiuser detection, calledSIC/RAKE, is presented. It is based on a modified multistage Successive Interference Cancellation (sic) structure that enables efficient detection in multipath propagation environments, thanks to a single userRAKE receiver incorporated in each unit of thesic structure. Furthermore, a modified version of thesic structure, calledSIC/MMSE, that ensures convergence to theMMSE detector rather than to the decorrelating detector has been suggested. The convergence of theSIC/RAKE andSIC/MMSE methods is proved. Simulation results for the Universal Mobile Telecommunication System (UMTS) have been carried out for flat fading Rayleigh multipath channels, showing that the proposed detector is resistant to the near-far effect and that low performance loss is obtained compared to the single-user bound.

Résumé

Dans cet article, on considère la liaison montante d’un système de radiocommunications avec les mobiles à Accès Multiple par Répartition en Code (AMRC). Une nouvelle structure de suppression de l’Interférence d’Accès Multiple (IAM), baptiséeSIC/RAKE, est présentée. Elle est basée sur l’emploi d’une structure de suppression itérative d’interférence (sic) qui permet une détection efficace en présence de canaux à trajets multiples grâce à la mise en œuvre d’un récepteurRAKE mono-utilisateur dans chacune des unités de base du récepteursic. De plus, une version modifiée de la structuresic, baptiséeSIC/MMSE, qui implémente ité-rativement le détecteur MMSE plutôt que le décorrélateur, est proposée. On démontre la convergence des structuresSIC/RAKE etSIC/MMSE. Des simulations sont présentées pour le systèmeUMTS et des canaux de propagation de Rayleigh à trajets multiples. Les résultats montrent que la structure proposée est résistante au phénomène d’éblouissement et que la dégradation des performances en termes de probabilité d’erreur est faible par rapport à la borne mono-utilisateur.

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Authors and Affiliations

  1. Signal and Communications Department, ENST-Bretagne, BP 832, 29285, Brest Cedex, France

    Mahmoud Ammar, Thierry Chonavel & Samir Saoudi

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  1. Mahmoud Ammar
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  2. Thierry Chonavel
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  3. Samir Saoudi
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Correspondence to Samir Saoudi.

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Ammar, M., Chonavel, T. & Saoudi, S. Iterative successive interference cancellation for multi-user DS/CDMA detectors in multipath channels. Ann. Télécommun. 57, 105–124 (2002). https://doi.org/10.1007/BF02994613

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  • DOI: https://doi.org/10.1007/BF02994613

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