Source: http://bibliotekevirtual.org/index.php/2013-02-07-03-02-35/2013-02-07-03-04-00/106-s/226-diversidade-cooperativa-adaptativa-aplicada-a-redes-de-sensores-sem-fio.html
Timestamp: 2019-04-23 06:59:52+00:00

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Resumo: Redes de sensores sem fio (RSSFs) têm se tornado populares em diversas áreas de aplicações industriais, civis, multimídia, etc. O desempenho desses sistemas pode ser melhorado pela utilização da técnica de diversidade cooperativa adaptativa (SCA), que é basicamente um projeto de relacionamento entre camadas que combina o ARQ Truncado na camada de enlace e a diversidade cooperativa na camada física. Adicionalmente, o protocolo LEACH provê a vantagem de utilizar a rotação aleatória de coordenadores de grupo locais, para igualmente distribuir a dissipação de energia entre os nós sensores na rede. Este trabalho propõe um sistema integrado, o SCA com LEACH, e avalia seu desempenho em relação ao sistema LEACH com ARQ Truncado. A comparação é baseada no tempo de vida da rede e taxa de perda de pacote do sistema, sob a variação de cenários de propagação, número de retransmissões, energia inicial por nó, comprimento do pacote de dados e tamanho físico da rede. A qualidade de transmissão de imagens usando as duas técnicas também é avaliada. Resultados de simulações mostram um melhor desempenho do sistema proposto.
Abstract: Wireless sensor networks (WSNs) are becoming popular in many applications, such as industrial, civilian, multimedia, etc. The need to improve the performance of such systems can be attained by using the adaptive cooperative diversity (SCA) technique, which is basically a cross-layer design that combines Truncated ARQ at the link layer and cooperative diversity at the physical layer. In addition, the LEACH protocol has the advantage of utilizing randomized rotation of local cluster-heads to evenly distribute the energy load among the sensors in the network. This dissertation proposes an integrated system, SCA with LEACH and evaluates its performance with LEACH with Truncated ARQ system. A comparison is obtained based on network lifetime and packet loss rate of the system under varying propagation scenarios, number of retransmissions, initial energy by node, packet length and network size. The performance of image transmissions using both techniques is also evaluated. Simulation results show better performances for the proposed system.
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