Título:	Sustained underwater acoustic communications with environmental-based time-reversal
Autor(es):	Silva, António. Jesus, Sérgio M..
Autor(es):	Maia, Lussac Prestes Silva, António Jesus, Sérgio M.
Palavras-chave:	Acústica Submarina
Áreas de conhecimento da DGPM:	Ciência, Tecnologia e Inovação
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.
Tipo de Acesso:	Acesso aberto
URI:	http://www.redebim.dphdm.mar.mil.br/vinculos/00001b/00001bfa.pdf http://www.repositorio.mar.mil.br/handle/ripcmb/844137
Tipo:	Artigo científico
Aparece nas coleções:	Ciência, Tecnologia e Inovação: Coleção de Artigos

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