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Construction et Analyse de Nouveaux Codes Spatio-Temporels pour les Systèmes Ultra Large Bande par Impulsions

Abstract : In this thesis, we present the construction of UWB transmitters and receivers over multi-antenna channels. Given the carrier-less nature of the UWB transmissions, most of the existing space-time (ST) coding schemes can not be associated with this nonconventional technique. In order to solve this problem, we propose new families of ST codes that can be associated with carrier-less UWB transmissions. At a first time, we adapt the mathematical tools based on cyclic division algebras to construct new totally-real coding schemes over the field of rational numbers. At a second time, we show that additional performance gains can be obtained when applying additional intra-symbol coding on the pulses used to convey a given information symbol. Finally, we propose a new approach for the construction of modulation-specific codes that can be associated with pulse position modulation and with hybrid pulse position and amplitude modulation. The new modulation-specific codes show the best known performance among the existing ST-UWB schemes. In some situations, these codes satisfy all the construction constraints of the perfect codes in addition to the constraint of being totally real. We also consider the problem of constructing distributed ST-UWB codes that permit to profit from the spatial diversity in a distributed manner. Novel amplify-and-forward and decode-and-forward strategies are proposed and investigated over the UWB channels. We present analytical, semi-analytical and numerical analysis of the proposed solutions over realistic indoor highly frequency-selective channels. Issues related to the transceiver design and decoding strategies of practical UWB systems are studied.<
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Submitted on : Thursday, October 19, 2006 - 8:00:00 AM
Last modification on : Friday, July 31, 2020 - 10:44:07 AM
Long-term archiving on: : Sunday, November 27, 2016 - 12:36:46 AM


  • HAL Id : pastel-00001968, version 1



Chadi Abou Rjeily. Construction et Analyse de Nouveaux Codes Spatio-Temporels pour les Systèmes Ultra Large Bande par Impulsions. domain_other. Télécom ParisTech, 2006. Français. ⟨pastel-00001968⟩



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