Performance analysis for amplify and forward full-duplex relaying with direct link over Nakagami-m fading channel

In order to keep up with countless emerging applications requirements, cellular systems have to embed new flexible aspects, with the aim of satisfying future wireless environments expectations. In this context, we consider a cellular system based a full-duplex amplify-and-forward cooperative communication over Nakagami-m channel. We assume the direct link between the source and the destination is non-negligible and we propose a combining scheme, at the destination side, that captures the joint benefit of relay and direct links. In order to meet with mission-critical applications requirements namely, low latency and reliability, the paper investigates the latency impact on the system performance and highlights the system diversity through the use of a combining scheme. First, we derive a new closedform expression of the studied system outage probability. Then, we confirm the theoretical results with Monte-carlo simulations. Furthermore, for more consistent analysis, we compare our combining scheme to Selective Decode-and-forward (SDF) scheme, recently proposed for full-duplex relaying as well as to some classical schemes. Simulation results show that they outperform each other depending on the relay processing delay, packet length, and the direct link gain.