Use este identificador para citar ou linkar para este item: http://repositorio.mar.mil.br/handle/ripcmb/844137
Título: Sustained underwater acoustic communications with environmental-based time-reversal
Orientador(es): Silva, António.
Jesus, Sérgio M..
Autor(es): Maia, Lussac Prestes
Palavras-chave: V - CIÊNCIA, TECNOLOGIA E INOVAÇÃO (DGPM-305)--
V1 - ACÚSTICA SUBMARINA (DGPM-305)--
Data do documento: 2018
Descrição: Inclui bibliografia.
The usage of time-reversal in underwater communications relies on array channel matched-filtering, coherent channel replica alignment and summation. Traditionally, replicas are channel responses to probe signals received at a previous time. These are noisy and subject to distortion due to channel variability. This paper offers an alternative where noisy and potentially distorted channel replicas are replaced by noise-free and time-updated replicas generated by a numerical model constrained on previously data-identified environmental parameters. The method is applied on real data, where a quadrature phase shift key modulated signal on a 25.6 kHz carrier at 4 kbit/s was transmitted in a shallow water area over a distance of approximately 900 m. Sustained analysis without supervision shows that the proposed method may attain a mean square error gain up to 5.4 dB when compared to tradi- tional time-reversal.
URI: http://www.redebim.dphdm.mar.mil.br/vinculos/00001b/00001bfa.pdf
http://repositorio.mar.mil.br/handle/ripcmb/844137
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