Energy Accumulating Based Wireless Information and Power Transfer

摘要

In this paper, a bidirectional wireless information and power transmission model with an energy accumulating relay is studied. To implement wireless information and power transmission simultaneously, a time-switching (TS) protocol is adopted. In addition, two energy harvesting (EH) protocols are proposed, named bidirectional continuous time EH (BI-CT) protocol and bidirectional discrete time EH (BI-DT) protocol. The relay node stores energy during poor channel conditions, increasing the energy efficiency. Theoretical analyses on the performance of the two proposed protocols are given. It is found that the throughput depends on various system parameters, such as the transfer power at the relay, distance between and so on. Furthermore, it is observed that BI-DT outperforms BI-CT when the noise power at the relay is high or the distance between the source and the relay is large.