A full-duplex SWIPT relaying protocol based on discrete energy state

Abstract

In this paper, a new transmission protocol is proposed to improve the performance of the power-splitting energy harvesting relaying system. Since the decode-and-forward relay operates in the full-duplex mode, the relay energy state exhibits a complex charge-discharge behavior. Based on the discretization of the relay battery energy, the transfer probability of the relay energy state is analyzed by using the Markov chain, and the initial distribution of the relay energy state is presented. We further derive the closed-form expression of the outage probability. The numerical results verify the accuracy of the derived closed-form expression and reveal the influence of the power allocation factor and the relay transmit power on the system performance.