Optimal Power Splitting for Simultaneous Wireless Information and Power Transfer in Amplify-and-Forward Multiple-Relay Systems

Authors:
Open Access
Publisher website
Google Scholar
Abstract
In this paper, we investigate simultaneous wireless information and power transfer (SWIPT) amplify-and-forward (AF) relay systems, in which multiple relay nodes support communication between a source node and a destination node. Relay node transceivers are equipped with radio frequency (RF) energy harvesters for a power source to retransmit the signals from the source to the destination node. Both power splitting (PS) ratio and adaptive power control are jointly optimized for SWIPT multiple-relay systems. We prove that the optimal power allocation strategy in our joint solution is to fully use the harvested power, which is contrary to conventional non- SWIPT multiple-relay systems. Based on this result, we propose an optimal centralized PS scheme and suboptimal distributed PS methods. Simulation results demonstrate that the proposed schemes outperform naive PS schemes in terms of the average rate and the bit-error rate.
Funding Information
  • Korea Evaluation Institute of industrial Technology, Korea Government (MOTIE), Development of non-binding multimodal wireless power transfer technology for wearable device (10079984)
  • Institute for Information and Communications Technology Promotion, Korea Government (MSIT), Cross layer design of cryptography and physical layer security for IoT networks (B0722-16-0006)
  • Basic Science Research Program through the National Research Foundation of Korea, Ministry of Education, Science and Technology (NRF-2017R1A2B4012719)

This publication has 27 references indexed in Scilit: