Double discrete‐time‐switch protocol for SWIPT at the energy harvesting relays: Protocol design and optimization

Abstract

Here, the energy harvesting (EH) relaying node which needs to complete the simultaneous wireless information and power transfer (SWIPT) is considered. The EH relaying node uses the EH technique to get the energy supply and uses the directional transmission to improve the performance of SWIPT. The double discrete-time-switch (D-DTS) based energy harvesting–power transfer–information transmission (EH–PT–IT) protocol is designed. One of the discrete-time-switch (DTS) controls the receiver of the EH relaying node and the other controls the transmitter. The performance is analysed by considering the average information rate and the average transferred power. The expressions of the average information rate and the average transferred power are derived analytically. The balanced maximization is considered, and the optimal parameters are obtained analytically. The simulations are presented to verify the analytical results and compare the performance. Comparing with previous works, the SWIPT performance using D-DTS protocol in this work is better.