Eficiência energética e throughput seguros em decode-and-forward seletivo com alocação de potência distribuída

• Ano de defesa: 2015
• Autor(a) principal: Farhat, Jamil de Araujo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Tecnológica Federal do Paraná; Curitiba; Programa de Pós-Graduação em Engenharia Elétrica e Informática Industrial
• Palavras-chave em Português: Sistemas de comunicação sem fio - Conservação de energia; Sistemas de transmissão de dados; Processamento de sinais - Técnicas digitais; Algorítmos; Redes de computadores; Otimização matemática; Métodos de simulação; Engenharia elétrica; Wireless communication systems - Energy conservation; Data transmission systems; Signal processing - Digital technique; Algorithms; Computer networks; Mathematical optimization; Simulation methods; Electric engineering
• Link de acesso: http://repositorio.utfpr.edu.br/jspui/handle/1/1368

We investigate the secure energy efficiency and throughput in cooperative wireless communications systems, in which a pair of legitimate users (Alice and Bob) are assisted by a relay node and the communication occurs in the presence of a passive eavesdropper (Eve). Several cooperative protocols are compared with respect to these measures and we use of an iterative and distributed algorithm, based on Dinkelbach algorithm, to allocate power between Alice and the relay. The power allocation is performed in order to increase the secure energy efficiency, measured in secure bits/J/Hz, or secure throughput, measured in secure bits/s/Hz. About the protocols, we consider the case where Alice has perfect knowledge only about the instantaneous channel state of the legitimate channel. So, we employ a Selective Decode-and-Forward (SDF) protocol, which chooses the best type of communication between Alice and Bob (direct or cooperative communication) in order to improve security. For comparison, we consider other classical cooperative schemes such as the Amplify-and-Forward (AF), the Fixed Decode-and-Forward (DF) and the Cooperative Jamming (CJ). Our results show that SDF outperforms AF, DF and CJ in most situations. However, when the transmit rate increases or when Eve is close to the legitimate nodes, CJ has a better performance.