Space-time coding techniques with bit-interleaved coded modulations for MIMO block-fading channels

The space-time bit-interleaved coded modulation (ST-BICM) is an efficient technique to obtain high diversity and coding gain on a block-fading MIMO channel. Its maximum-likelihood (ML) performance is computed under ideal interleaving conditions, which enables a global optimization taking into account channel coding. Thanks to a diversity upperbound derived from the Singleton bound, an appropriate choice of the time dimension of the space-time coding is possible, which maximizes diversity while minimizing complexity. Based on the analysis, an optimized interleaver and a set of linear precoders, called dispersive nucleo algebraic (DNA) precoders are proposed. The proposed precoders have good performance with respect to the state of the art and exist for any number of transmit antennas and any time dimension. With turbo codes, they exhibit a frame error rate which does not increase with frame length.Comment: Submitted to IEEE Trans. on Information Theory, Submission: January 2006 - First review: June 200

WHERE2 Location Aided Communications

This paper presents an overview of preliminary results of investigations within the WHERE2 Project on identifying promising avenues for location aided enhancements to wireless communication systems. The wide ranging contributions are organized according to the following targeted systems: cellular networks, mobile ad hoc networks (MANETs) and cognitive radio. Location based approaches are found to alleviate significant signaling overhead in various forms of modern communication paradigms that are very information hungry in terms of channel state information at the transmitter(s). And this at a reasonable cost given the ubiquitous availability of location information in recent wireless standards or smart phones. Location tracking furthermore opens the new perspective of slow fading prediction

Allele mining in grape for the analysis of complex traits

International audienceIn the past decade, thanks to an important international effort, our understanding of grape nuclear diversity greatly improved, in particular through European Programs such as GenRes81 and GrapeGen06 leading to the standardization of SSR analysis. Our knowledge of grape diversity in genes, is however still limited. A precise knowledge of gene diversity will be highly beneficial in order to improve our understanding of quantitative important traits. Since the publication of the grape sequence, we have now the possibility to study gene diversity in grape at a large scale. In the present work, SSR diversity in the INRA grape collection (2300 cultivars) enabled the definition of a highly diverse sample of 27 V. vinifera accessions. This set was completed by 7 accessions of V. vinifera subsp. sylvestris and several accessions of Vitis species from Asia or America. Analysis of gene diversity over this sample of 47 accessions was thus performed for a set of 900 genes scattered through the grape genome. Through bioinformatics developments, diversity maps of the grape genome have been drawn at different levels. This data will be very useful in order to select markers for mapping, for comparison of diversity between Vitis species and for the search of selective sweeps in grape. It will also be very useful in the assessment of DL in grape, a prerequisite for Whole Genome Association studies

Synthèse optique d'ondes hyperfréquences et millimétriques à très bas bruit de phase : résultats préliminaires

National audienceNous avons conçu et construit un système optique de synthèse d’ondes hyperfréquences, millimétriques et submillimétriques à très bas bruit de phase. Les résultats préliminaires montrent une densité spectrale de bruit de phase à 10 kHz de la porteuse d’une onde à 9 GHz limitée par l’appareil de mesure. Pour les bruits plus près de la porteuse, le bruit de phase est limité par une modulation d’amplitude résiduelle : le système est en cours de modifications

CELTIC CP5-026 WINNER+, D1.9 Final Innovation Report

This deliverable is the final innovation report from the innovation workpackage in WINNER+. The document describes the latest innovations and their assessment as well as summarizes the innovations developed in the work package during the project. We analyze the suitability of these innovations as technology enablers for improving current systems, in particular IMT Advanced and beyond

CELTIC CP5-026 WINNER+, D1.9 Final Innovation Report

This deliverable is the final innovation report from the innovation workpackage in WINNER+. The document describes the latest innovations and their assessment as well as summarizes the innovations developed in the work package during the project. We analyze the suitability of these innovations as technology enablers for improving current systems, in particular IMT Advanced and beyond