Otimização dos parâmetros de um sistema de comunicação acústica subaquática para minimizar o consumo energético

• Ano de defesa: 2016
• Autor(a) principal: Souza, Fabio Alexandre de
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Tecnológica Federal do Paraná; Curitiba; Brasil; Programa de Pós-Graduação em Engenharia Elétrica e Informática Industrial; UTFPR
• Palavras-chave em Português: Energia elétrica - Consumo; Acústica subaquática; Códigos corretores de erros (Teoria da informação); Sistemas de comunicação sem fio; Sistemas de transmissão de dados; Modem; Otimização matemática; Métodos de simulação; Engenharia elétrica; Electric power consumption; Underwater acoustics; Error-correcting codes (Information theory); Wireless communication systems; Data transmission systems; Modems; Mathematical optimization; Simulation methods; Electric engineering; CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA::TELECOMUNICACOES::SISTEMAS DE TELECOMUNICACOES; Engenharia Elétrica
• Link de acesso: http://repositorio.utfpr.edu.br/jspui/handle/1/2746

In this Thesis, an energy consumption model for underwater acoustic networks is proposed. The model takes into account the specificities of the underwater environment, such as the use of acoustic waves for communication, dependence of the underwater acoustic channel bandwidth with the path loss, which varies with both the distance and frequency, and noise. The fading, usually modeled by Rayleigh and Rice distributions on terrestrial communications, in this work, is modeled by the K distribution, which best represents the severity of the underwater environment. The model considers a linear multi-hop underwater network and the possibility of retransmissions to calculate the total energy consumed for each bit of information successfully transmitted between the source and the destination. In order to obtain the minimum energy, the SNR and the operating frequency are also optimized. The use of convolutional codes is considered and the optimal code rate, which leads to the minimum energy consumption, is determined. A theoretical analysis was developed for two scenarios: delay constrained and delay unconstrained networks, indicating the optimal number of hops which minimizes energy consumption. Next, the impact of the number of transmission trials was considered. A numerical analysis was also performed for both the scenarios. The numerical results validate the theoretical analysis, showing that the multi-hop scheme is more efficient in terms of energy consumption when compared to direct transmission. Furthermore, the results show that a small number of transmission trials is sufficient to achieve a considerable reduction in energy consumption in multi-hop networks, limiting the average delay per packet transmitted, which is very interesting in real applications.