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Turbo soft interference cancellation for coded asynchronous ds/cdma

Turbo-annulation de brouillages dans un système de transmission asynchrone ds/cdma

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Abstract

In this paper we propose a Multiuser receiver architecture which removes the Multiple Access Interference (Mai) by means of a Soft Input Soft Output (siso) multiuser detector followed by a bank of channel decoders. The extrinsic information at the output of the channel decoders are used to estimate the values of the interfering bits and the SISO multiuser detector subtracts the vector of the interfering bits from the incoming signal. The resulting vector is then filtered by an adaptive mmse filter to help remove the residual mai. The paper examines the use of such a receiver in the context of a synchronous awgn channel and then we generalize to the case of asynchronous multipath fading channels.

Résumé

Dans cet article nous étudions la structure d’un récepteur multiutilisateurs qui élimine le brouillage d’accès multiple à l’aide d’un détecteur multiutilisateurs à sorties pondérées suivi d’un bane de décodeurs de canal. L’information extrinsèque en sortie de chaque décodeur de canal est utilisée pour estimer la valeur des bits brouilleurs et le détecteur multiutilisateurs retranche le vecteur des bits brouilleurs au signal d’entrée. Unfiltrage adaptatif selon les moindres carres est alors appliqué pour éliminer le brouillage d’accès multiple rèsiduel. Nous examinons l’implantation de ce récepteur dans les contextes d’un système synchrone à bruit additif gaussien et d’un système asynchrone à trajets multiples.

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Authors and Affiliations

  1. GESTE Groupe d’Etude des Systèmes de Télécommunications, École Nationale Supérieure d’Ingénieurs de Limoges, Pare d’ESTER Technopole, 87068, Limoges Cedex

    J. P. Cances, V. Meghdadi & G. R. Mohammadkhani

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  1. J. P. Cances
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  2. V. Meghdadi
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  3. G. R. Mohammadkhani
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Cances, J.P., Meghdadi, V. & Mohammadkhani, G.R. Turbo soft interference cancellation for coded asynchronous ds/cdma. Ann. Télécommun. 56, 422–434 (2001). https://doi.org/10.1007/BF02995453

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  • DOI: https://doi.org/10.1007/BF02995453

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