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Réseau acoustique de communication bidirectionnelle ultrasonore efficace en milieu fermé

Abstract : The methods and techniques of airborne acoustic communications indoors represent a relevant alternative to radio-frequency communications, for example in ATEX zones, environments with strong electromagnetic interference or even to ensure a high level of confidentiality. However, the limitations of such communications are low through put and the inability to function properly in the presence of an obstacle or complex path. In order to overcome these limitations, this research work introduces and develops theoretically and experimentally a new acoustic communication system based on previous research and developments of the company STIMSHOP. The system operates in the frequency domain of near ultrasoundusing spread spectrum modulation, chirps. Thus, user discomfort is minimized, compatibility with consumer equipment increased, and signals are robust against interference. A first work on the synthesis of signals makes it possible, overlapping of symbols and the use of particular forms of modulation, to obtain an improvement of the bit rate and of the encoding capacities. An analytical decoding error prediction model, specific to chirps, is developed and evaluated. A second work presents the development and evaluation of a transceiver element making it possible to carry out SISO communications.The assembly of several of these elements thus allows the development of a time reversal mirror, accompanied by a dedicated communication protocol. This communication system is then evaluated in a wide range of indoor configurations,in real and constrained environments, and for MISO and MU-MISO transmission schemes. The system is also designed for communications between a time-reversing mirror and one or more smartphones. This highlights the capabilities of this system vis-à-vis a conventional SISO system, in particular the gain linked to focusing and operation in LOS and NLOS configuration, but also its limits.
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https://pastel.archives-ouvertes.fr/tel-03264278
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Submitted on : Friday, June 18, 2021 - 9:34:08 AM
Last modification on : Wednesday, November 17, 2021 - 12:31:53 PM
Long-term archiving on: : Sunday, September 19, 2021 - 6:16:49 PM

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  • HAL Id : tel-03264278, version 1

Citation

Arthur Aubertin. Réseau acoustique de communication bidirectionnelle ultrasonore efficace en milieu fermé. Réseaux et télécommunications [cs.NI]. Université Paris sciences et lettres, 2021. Français. ⟨NNT : 2021UPSLM007⟩. ⟨tel-03264278⟩

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