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Conceção de protocolos de encaminhamento para redes ad hoc de rádio cognitivo by S. M. Kamruzzaman

Conceção de protocolos de encaminhamento para redes ad hoc de rádio cognitivo

by S. M. Kamruzzaman
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Book cover type: Paperback
  • ISBN13: 9786208585785
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Edicoes Nosso Conhecimento
  • Publisher Imprint: Edicoes Nosso Conhecimento
  • Publication Date:
  • Pages: 92
  • Original Price: USD 64.0
  • Language: Portuguese
  • Edition: N/A
  • Item Weight: 137 grams
  • BISAC Subject(s): Networking / General

A tecnologia de rádio cognitiva (CR) foi proposta para utilizar o espetro vago da banda de frequências licenciada de forma oportuna, sem interferências ou colisões prejudiciais para os utilizadores primários. As redes CR referem-se a redes em que os utilizadores CR estão equipados com CRs ágeis em termos de espetro. As redes CR ad hoc (CRAN) são redes CR dinâmicas e auto-organizadas de múltiplos saltos, em que os utilizadores CR podem comunicar entre si através de uma ligação ad hoc. O encaminhamento é uma das questões mais importantes nas redes ad hoc multi-hop. Nas CRAN, é possível estabelecer uma rota eficiente tendo em conta a energia limitada do utilizador de CR alimentado por bateria e a atividade do utilizador principal. Este livro apresenta questões relacionadas com os níveis 2 e 3 da pilha de protocolos na conceção de um protocolo de encaminhamento para CRANs multi-hop. Em primeiro lugar, é introduzido um esquema de controlo de acesso ao meio (MAC) baseado em programação que pode utilizar vários canais de forma oportunista e assegurar uma transmissão sem contenção com uma única interface de rádio. Em seguida, é apresentado o mecanismo de conceção e avaliação do desempenho de um protocolo de encaminhamento sensível ao espetro e à energia para as CRAN, que envolve conjuntamente a seleção de rotas e a atribuição de faixas horárias de canal.

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