Résumé
Cet article présente des stratégies de codage permettant d’implanter Vidée du codage avec information adjacente (ou dpc, dirty paper coding) dans le cadre du canal de diffusion avec un émetteur et des récepteurs à antennes multiples. Ce travail décrit des stratégies de codage qui utilisent la connaissance du canal à l’émetteur qui s’inspirent de concepts suggérés par la théorie de l’information. La mise en œuvre complète des algorithmes de codage et de décodage nous permet d’évaluer les performances de ces stratégies en termes de taux d’erreurs binaires et non pas en terme de région de débit de codage. Différents codeurs internes et externes sont comparés entre eux. Enfin, nous considérons le codage dpc en tant que stratégie d’accès multiple et le comparons avec l’accès multiple temporel (TDMA). Nous verrons que les résultats obtenus pour les codeurs pratiques proposés ne concordent pas toujours avec les prédictions théoriques pour les codeurs optimaux.
Abstract
We propose several dirty paper coding schemes for the broadcast channel when both the transmitter and receivers are equipped with multiple antennas. These schemes are based on channel state information at the transmitter and inspired from information-theoretic concepts. The proposed end-to-end algorithms allows us to evaluate the performance of the broadcast channel in terms of bit error rates and not in terms of coding rates as it is usually the case in the literature. Different inner coding schemes such as the ZF-DPC and MMSE-DPC and different outer coding schemes such as the THS, SCS and TCQ are compared and discussed. We also consider the DPC idea as a way of implementing a multiple access scheme. In this respect it is compared with the well-known TDMA scheme. Sometimes our conclusions show quite surprising results in comparison to what is expected by pure information-theoretic considerations.
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Ce travail de recherche a été sponsorisé par France Télécom R&D et a été effectué dans le cadre du contrat No 46 127 353 entre France Telecom R&D et le CNRS. Des parties de cet article ont été présentées dans les actes de deux conférences IEEE: [2] et [1].
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Lasaulce, S., Dumont, J., Mohammad-Khani, G.R. et al. Codage avec information adjacente pour les canaux de diffusion MIMO. Ann. Telecommun. 62, 1143–1170 (2007). https://doi.org/10.1007/BF03253310
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DOI: https://doi.org/10.1007/BF03253310
Mots clés
- Codage
- Théorie de l’information
- Radiocommunication service mobile
- Codage treillis
- Taux erreur
- Capacité canal
- Brouillage signal