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Architectures fonctionnelles de transmission sans fils adaptées aux milieux industriels fortement bruités

Abstract : Recent years have been marked by rapid and profound changes in data transmission technologies. These changes are dictated by the massive increase in data rates, the diversity of physical media, the multiplication of joint transmission standards and interoperability requirements, as well as the increase in constraints linked to the quality of service, which are reflected in particular in operational safety constraints (reliability, fault tolerance). In the field of wireless communications, these aspects are compounded by the use of an already congested and non-extensible frequency spectrum, as well as the need to take account of the mobility, autonomy and safety of users. Inevitably, all this leads to very strong constraints in the design of transmission circuits and systems that must support the new transmission protocols. This is particularly the case for all aspects relating to error-correcting codes responsible for protecting communications against external disturbances likely to alter the information transmitted. In fact, the processing algorithms to be implemented, which are very demanding in terms of throughput and complexity, make the existing coding/decoding architectures unsuitable because of their insufficient computing capacity. The aim of the thesis is in the continuation of previous work that has been the subject of several theses and publications concerning architectures dedicated to the processing of error-correcting codes, processor architectures and on-chip network architectures, while focusing on the fault tolerance aspects. The overall objective here is to design new functional digital architectures based on discrete wavelet packet modulation, using Inverse Discrete Wavelet Packet Transform (IDWPT) in transmission, and Discrete Wavelet Packet Transform (DWPT) in reception, exploiting two transmission modes: One-to-Many (OtM) for transmission between a single transmitter and several sensors ranging from 8, 16 up to 32 or more, and a Many-to-One (MtO) mode for transmission between several users and a single receiver with the same possible configuration, followed by the integration of modern correction codes in our architecture (notably the different families of Reed Solomon codes and Convolutional Codes), offering high processing power and versatility (flexibility and configurability), for high noise industrial environments. The use of error-correcting codes allowed us to have a gain of 4 to 6dB for Reed Solomon codings and convolutional codes used individually, 5 to 10db with the combination of these two codes and 2 to 4dB more for shortened Reed Solomon codes.
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  • HAL Id : tel-03176510, version 1

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Aamre Khalil. Architectures fonctionnelles de transmission sans fils adaptées aux milieux industriels fortement bruités. Traitement du signal et de l'image [eess.SP]. Université de Lorraine, 2020. Français. ⟨NNT : 2020LORR0183⟩. ⟨tel-03176510⟩

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