annales-telecoms-13oct06

annales-telecoms-13oct06 - 1 Codage avec information...

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1 Codage avec information adjacente pour les canaux de diffusion MIMO - Dirty paper coding schemes for MIMO broadcast channels S. Lasaulce, J. Dumont, G. R. Mohammad-Khani, R. Visoz CNRS/LSS - Sup´elec 3 rue Joliot-Curie - 91192 Gif-sur-Yvette Cedex-France [email protected], [email protected] 23 octobre 2006 R´esum´e Cet article pr´esente des strat´egies de codage pratiques permettant d’implanter l’id´ee du (( dirty paper coding )) introduite par la th´eorie de l’information dans le cadre du canal de diffusion avec un ´emetteur et des r´ecepteurs multi-antennes. Le pr´esent travail d´ecrit des strat´egies de codage canal qui utilisent la connaissance du canal `a l’´emetteur et dont la conception s’inspire des concepts sugg´er´es par la th´eorie. La mise en oeuvre compl`ete des algorithmes de codage et de d´ecodage nous permet alors d’´evaluer les performances de ces strat´egies en termes de taux d’erreurs binaires et non pas en terme de r´egion de taux de codage comme c’est souvent le cas dans les travaux existants. Diff´erents codeurs internes (ZF-DPC, MMSE-DPC) et externes (THS, SCS, TCQ) sont compar´es entre eux. Enfin, nous consid´erons le codage DPC en tant que strat´egie d’acc`es multiple et le comparons avec le TDMA. Nous verrons d’ailleurs que les r´esultats obtenus pour les codeurs pratiques propos´es ne concordent pas toujours avec les pr´edictions th´eoriques pour les codeurs optimaux au sens de la th´eorie de l’information. Abstract In this paper we propose several dirty paper coding schemes for the broadcast channel when both the transmitter and receivers are equipped with multiple antennas. These coding schemes are based on channel state information Ce travail de recherche a ´et´e sponsoris´e par France T´el´ecom R & D et a ´et´e effectu´e dans le cadre du contrat No 46 127 353 entre France Telecom R & D et le CNRS. Des parties de cet article ont ´et´e pr´esent´ees dans les actes de deux conf´erences IEEE : SPAWC en juillet 2006 et ISSPIT en aoˆut 2006.
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2 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 corresponding 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-know TDMA scheme. Sometimes our conclusions show quite surprising results in comparison to what is expected by pure information-theoretic considerations.
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