Desempenho de redes cooperativas full-duplex baseadas em NOMA e seleção parcial de relays

• Autor(a) principal: Tregancini Junior, Anderson [UNESP]
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/156790; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2018-06-25/000902292.pdf
• topic: Comunicações digitais; Sistemas de comunicação sem fio; Telecomunicações; Digital communications; Telecommunication; Wireless communication systems

With the rapidly increasing demand for wireless-based applications and services, the need to efficiently exploit the radio spectrum is imperative. In addition, fifth-generation (5G) networks must satisfy some requirements regarding the quality of service provided to their users, such as increased spectral efficiency, higher data rates and support for a massive number of connected devices. In light of this, non-orthogonal multiple acess (NOMA) and full-duplex relaying are technologies being considered, in order to achieve these objectives, as candidates to be part of the specifications of 5G networks. NOMA is a strategy whereby multiple users can share the same time, frequency or code resources, by adjusting their power allocation ratio, whereas full-duplex relaying allows to recover the spectral efficiency loss inherent to half-duplex relaying. Thus, the joint use of NOMA and full-duplex relaying has been drawing attention, due to the gains in spectral efficiency and data rate, as well as to the decrease in latency, in addition to taking advantage from the spatial diversity obtained through cooperative communications. This work analyzes the performance in terms of the outage probability for a NOMA-based cooperative scheme, which employs full-duplex relaying and the amplify-and-forward protocol, with partial relay selection. The considered system model consists of one source, two users, acessing the channel through NOMA, and a cluster of full-duplex relays. As contributions of this work, an exact expression in integral form, a lower-bound expression, an asymptotic expression at the high signal-to-noise ratio regime and an approximated losed-form expression are obtained. From the analytical expressions, the impact of the numbers of relays, the power allocation factor between users, and the residual self-interference inherent to full-duplex relaying is assessed on the performance of the proposed system. In addition, a performance comparison is...