Capitalizing on the benefits of non-orthogonal multiple access (NOMA) and full-duplex relaying as key technologies to boost spectral efficiency in the next generation of wireless communications, herein we investigate the performance of a cooperative network in which a source communicates with two destinations via one node selected from a set of full-duplex amplify-and-forward relays. For this purpose, a power-domain NOMA scheme is used to transmit information from the source to the destinations, and partial relay selection is performed to choose the relay based on the channel state information of the first hops. The system performance is characterized in terms of both the outage probability and the ergodic capacity, for which, exact analytical expressions are derived in integral form. In addition, to reduce the computational complexity of the obtained analytical results, closed-form expressions are derived from lower-bound, approximate, and asymptotic analyses. From these analytical expressions, the impact on the system performance of the number of relays, the power allocation factor between the NOMA destinations, and the residual self-interference at full-duplex relays is assessed. The correctness of our analyses is validated by Monte Carlo simulations, and a comparison with the half-duplex relay-aided NOMA system counterpart is also provided.

This paper proposes an analytical framework based on the H-function distribution to study the performance of nonorthogonal multiple access (NOMA)-based wireless networks. More specifically, herein we investigate the outage performance and the ergodic capacity of a three-node linear network topology where a source uses power-domain NOMA to communicate with two destinations over independent, but not necessarily identically distributed Nakagami-m fading channels. A Monte Carlo simulations campaign was carried out to support the proposed framework.

Resumo-Este trabalho analisa o desempenho em termos da probabilidade de outage para um esquema cooperativo baseado em NOMA, que emprega seleção parcial de relays. O modelo do sistema considerado consiste de uma fonte, dois usuários os quais acessam o canal usando NOMA, e um cluster de relays amplificae-encaminha do tipo full duplex. Como contribuições deste trabalho, expressões analíticas exatas em forma de uma integral simples e expressões analíticas em forma fechada assintóticas no regime de alta relação sinal-ruído foramobtidas. A partir dessas expressões analíticas, avalia-se o desempenho do esquema de comunicação proposto. Simulações de Monte Carlo validam os resultados obtidos. Palavras-Chave-Amplifica-e-encaminha, full-duplex, NOMA, probabilidade de outage, seleção parcial de relays. Abstract-This work analyzes the performance in terms of the outage probability for a NOMA-based cooperative scheme, which employs partial relay selection. The considered system model consists of one source, two users accessing the channel using NOMA, and a cluster of full-duplex amplify-and-forward relays. As contributions of this work, exact single-fold integral expressions and asymptotic closed-form expressions at the high signal-to-noise ratio regime are obtained. From these analytical expressions the performance of the proposed communication scheme is assessed. Monte Carlo simulations validate the obtained results.