Two way amplify and forward relay with energy harvesting: Performance analysis

In this work, we consider a wireless communication network between two node terminals $A,B$ which is aided by a two way relay $R$. Besides the relay path, we assume an additional direct path between $A,B$. The relay $R$ is energy constrained and thus performs energy harvesting (EH) by Time Switching (TS) architecture to meet its energy requirements. The relay forwards the received signal through Amplify and Forward (AF) protocol to the terminals which then perform selection combining (SC) for the signals received through direct and relay paths and decode the transmitted message. Expressions for system outage probability with asymptotic analysis, ergodic capacity are derived in closed form under Nakagami-m fading conditions. Further, the impact of parameters like TS factor are studied on the outage probability, ergodic capacity, energy efficiency and system throughput. The results obtained are verified through Monte Carlo simulations.