A Semi-Blind Channel Estimation Technique based on Second-Order Blind Method for CDMA Systems

Samson Lasaulce 1 Philippe Loubaton 2 Eric Moulines 3
1 L2S - Laboratoire des signaux et systèmes
2 LIGM - Laboratoire d'Informatique Gaspard-Monge
3 LTCI - Laboratoire Traitement et Communication de l'Information
Abstract : This paper aims at studying a semi-blind channel estimation scheme based on the subspace method or a carefully weighted linear prediction approach. The corresponding (composite) semi-blind cost functions result from a linear combination of the training-based cost function and a blind cost function. For each blind method, we show how to calculate the asymptotic estimation error. Therefore, by minimizing this error, we can properly tune the K-dimensional regularizing vector introduced in the composite semi-blind criterion (for K active users in the uplink). The asymptotic estimation error minimization is a K-variable minimization problem, which is a complex issue to deal with. We explicitly show under what conditions this problem boils down to K single-variable minimization problems. Our discussion is not limited to theoretical analyses. Simulation results performed in a realistic context (UMTS-TDD mode) are provided. In particular, we conclude about the potential of the proposed approach in real communication systems.
Keywords : Blind estimation Channel estimation Linear prediction Semi-blind estimation Subspace medthod
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Article dans une revue
IEEE Transactions on Signal Processing, Institute of Electrical and Electronics Engineers, 2003, 51 (7), pp.1894-1904
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https://hal.archives-ouvertes.fr/hal-00446291
Contributeur : Samson Lasaulce <>
Soumis le : mardi 12 janvier 2010 - 14:24:03
Dernière modification le : jeudi 9 février 2017 - 15:20:22
Document(s) archivé(s) le : vendredi 18 juin 2010 - 00:44:56

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Samson Lasaulce, Philippe Loubaton, Eric Moulines. A Semi-Blind Channel Estimation Technique based on Second-Order Blind Method for CDMA Systems. IEEE Transactions on Signal Processing, Institute of Electrical and Electronics Engineers, 2003, 51 (7), pp.1894-1904. <hal-00446291>

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