Communication Dans Un Congrès Année : 2024

An innovative Doppler-shift estimation design for underwater acoustic communication modem

Résumé

As a renewed interest in ocean exploration emerges, mainly driven by a much broader autonomous presence, underwater acoustic communications have become essential. But as acoustic waves are most effective only at ranges of several hundred meters, a number of problems arise in operational conditions, such as low throughput, long propagation delay, multipath effect and last but not least the impact of Doppler shift. In order to compensate for Doppler effect in the decoding stage, the Doppler shift must be accurately estimated at the receiver side. Several methods can be invoked, however the use of filter banks is known to be one of the most accurate method in the state of the art. In this paper, we propose an FPGA implementation of Doppler estimation based on correlation between received signal (which contains a known sequence) and numerous dopplerized version of this known sequence. We take advantage of FPGA technology to run 2 comparisons in parallel, and iterate following a dichotomy approach in order to converge towards the actual Doppler value. Compared to a solution that searches iteratively for the maximum correlation with n values, our approach only needs to make log2(n) comparisons, in only log2(n)/2 as much time, to achieve the same precision. This makes our implementation well suited for real-time applications while still keeping the resource footprint fairly low.

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Dates et versions

hal-04771137 , version 1 (07-11-2024)

Identifiants

  • HAL Id : hal-04771137 , version 1

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André Lalevée, Philippe Forjonel, Pierre-Jean Bouvet, Léo-Paul Pelletier. An innovative Doppler-shift estimation design for underwater acoustic communication modem. OCEANEXT 2024, Jun 2024, Nantes, France. ⟨hal-04771137⟩
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