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Iterative low-complexity receiver for the UMTS downlink

Récepteur itératif de faible complexité pour la liaison descendante de la norme UMTS

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Abstract

In this paper, an iterative low-complexity receiver is proposed for Code Division Multiple Access (cdma) systems with small spreading factors. Theumts (Universal Mobile Télecommunication System) radio interface based oncdma has been designed to offer a wide range of data rates using variable spreading factors. High data rate services are obtained by using small spreading factors. For such services, the spreading sequences have bad autocor-relation properties causing the degradation of the Rake receiver performance because of the InterSymbol Interférence (isi). In order to improve the receiver performance, we propose to add a Decision Feedback Sequence Estimation (dfse) equalizer at the Rake receiver output. Thedfse is a low complexity equalizer which is able to take into accounta priori probability ratios and to deliver a posteriori probability ratios on bits in order to exchange soft information with the channel decoder, so that the proposed receiver benefits from the turbo-processing gains. Channel estimation is also treated in an iterative fashion. The complete receiver is well suited to theumts downlink system as it drastically reduces theisi while keeping a reasonable computational complexity.

Résumé

Dans cet article, nous proposons un récepteur itératif de faible complexité pour les systèmes à Accès Multiples à Répartition par Codes (amrc) de faible facteur d’étalement. L’interface radio de la normeumts est basée sur l’amrc et permet d’assurer des débits variables en modifiant la longueur de la séquence d’étalement. Ainsi, des services nécessitant des débits élevés pourront être assurés grâce à l’utilisation de petits facteurs d’étalement. Pour de tels services, les séquences d’étalement possèdent de mauvaises propriétés d’autocorrélation ce qui dégrade les performances du récepteur en râteau à cause de l’Interférence Entre Symboles (ies). Pour améliorer les performances du récepteur, nous proposons de rajouter un égaliseurdfse (Decision Feedback Sequence Estimation) à la sortie du récepteur en râteau. L’égaliseur proposé permet aussi de délivrer une probabilité a posteriori des symboles décodés. Nous pourrons ainsi bénéficier du gain de turbo égalisation en utilisant la sortie souple du décodeur canal. L’estimation de canal est aussi effectuée de manière itérative. Le récepteur complet est particulièrement bien adapté à la liaison descendante de la normeumts dans la mesure où il réduit significativement l’ies tout en ayant une complexité de calcul raisonnable.

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Authors and Affiliations

  1. École Supérieure des Communications de Tunis, Route de raoued Km, 3.5, 2083, El Ghazala, Ariana, Tunisie

    Hatem Boujemaa

  2. France Telecom R&D/DMR/IIM, 38-40 rue du Général-Leclerc, 92794, Issy Moulineaux Cedex 9, France

    Raphael Visoz

  3. École Supérieure d’Electricité (SUPELEC), 3-5 rue Joliot Curie, Plateau de Moulon, 91192, Gif-sur-Yvette, France

    Antoine O. Berthet

Authors
  1. Hatem Boujemaa
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  2. Raphael Visoz
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  3. Antoine O. Berthet
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Corresponding author

Correspondence to Hatem Boujemaa.

Additional information

Hatem Boujemaa was born in 1974 in Tunis, Tunisia. He obtained the engineer Diploma from the École polytechnique de Tunisie in 1997, thedea of digital telecommunication systems fromenst-Paris in 1998 and the PhD degree in electronic and communications from the same university in 2001. From October 1998 to September 2001, he prepared his Ph. D. degree at France Telecom R&D, Issy les Moulineaux, France. During this period, he participated in thernrt projectaube. From October 2001 to January 2002, he joined École Supérieure d’Electricité (supelec), Gif-sur-Yvette, France, and worked on mobile localization forrnrt projectlutece. Since February 2002, he has been employed in École Supérieure des Communications de Tunis (supcom), Tunisia, as an Assistant Professor. His research work are in the field of digital communications and especially inds-sss, information theory, channel estimation, equalization, multi-user detection and antenna processing.

Raphel Visoz was born in Grenoble, France, in 1972. He received the preliminary doctorate certificate (dea) in Theoretical Physics from École Normale Supérieure (ens) de Lyon, France, in 1995 and the Dipl. Ing. in Telecommunications from École Nationale Supérieure des Télécommunications de Bretagne (enstb), Brest, France, in 1997, including a Mobile Communication specialization ateurecom, Sophia Antipolis, France. He received his Ph. D. degree in Digital Communications from the École Nationale Supérieure des Télécommunications (enst), Paris, France, in February 2002. Since November 1997, he has been working for France Telecom R&D, Issy Les Moulineaux, France in the field of third generation (and beyond) mobile radio systems.

Antoine O. Berthet was born in Paris, France, in 1974. He received the preliminary doctorate certificate (dea) in Signal Processing from École Nationale Supérieure des Télécommunications de Paris (enst), France, in December 1997, the Dipl. Ing. in Telecommunications from Institut National des Télécommunications (int telecom), Evry, France, in December 1997 year, and the Ph. D. degree in Computer Science, Electronics and Digital Communications fromenst and Université Pierre et Marie Curie de Paris (PARIS VI) in December 2001. From January 1998 to October 2000, he prepared his Ph. D. degree at France Telecom R&D, Issy les Moulineaux, France. From October 2000 to October 2001, he joined Alcatel Space Industries, Nanterre, France, and worked on high date rate modem design for satellites. Since October 2001, he has been employed in École Supérieure d’Electricité (supelec), Gif-sur-Yvette, France, as an Assistant Professor. His research interests include information theory and the theory of error-correcting codes, as well as other advanced communication techniques for wireless mobile and satellites environments.

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Boujemaa, H., Visoz, R. & Berthet, A.O. Iterative low-complexity receiver for the UMTS downlink. Ann. Télécommun. 59, 696–712 (2004). https://doi.org/10.1007/BF03179693

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