Impacto da interferência da rede primária sobre o desempenho de outage de uma rede cooperativa-cognitiva com seleção de retransmissores full duplex

• Autor(a) principal: Dourado, Silvio César Vicentim
• Data de Publicação: 2020
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/214100
• topic: Comunicações digitais; Sistemas de comunicação sem fio; Telecomunicações

The performance of a cooperative-cognitive network that operates under the interference effect generated by a primary network is analyzed in terms of the outage probability. The cooperative-cognitive network is composed of a source, multiple relays and a destination, which operate under the interference generated by multiple primary transmitters and a primary receiver, using the underlay spectral sharing technique. It is considered that the relays operate under the decode-and-foward protocol and full duplex relaying mode. Four relay selection criteria are considered to evaluate the cooperativecognitive network performance: (i) opportunistic criterion, which selects the relay that maximizes the end-to-end signal-noise-ratio (SNR) of the system; (ii) partial relay selection based on first-hop links, which selects the relay that maximizes the signal-to-noise-plus-interference ratio (SINR) of the first hops; (iii) partial relay selection based on second-hop links, which selects the relay that maximizes SINR of the second hops; and (iv) partial relay selection based on self-interference links, which selects the relay that minimizes SNR of the self-interference links. For these criteria, the combined effect of the interference generated by the primary transmitters, the interference temperature, the self-interference at the relays, and the number of relays is evaluated over the cooperative-cognitive network performance. Numeric Monte Carlo simulations are used to evaluate the network performance. Furthermore, analytical expressions are obtained for the asymptotic outage probability for all selection relay criteria, which are validated through the results obtained by numeric simulations.