Outage probability analysis and power splitter designs for SWIPT relaying systems with direct link

Hoon Lee, Changick Song, Soo Hwan Choi, Inkyu Lee

Research output: Contribution to journalArticlepeer-review

100 Citations (Scopus)


This letter investigates the outage performance for simultaneous wireless information and power transfer (SWIPT) relaying systems in the presence of direct link between the source and the destination. For the SWIPT, we employ a power splitter (PS) at the relay, which splits the received signal into the information transmission and the energy harvesting parts. First, we provide an analysis of the outage probability as a closed-form based on a high signal-to-noise ratio approximation. From the analysis, it is recognized that the diversity order of the SWIPT relaying systems equals that of the non-SWIPT cases. The closed-form outage expression also enables us to obtain a simple expression for the PS factor which minimizes the outage probability. Simulation results demonstrate the accuracy of the derived analysis and the efficiency of the proposed PS scheme.

Original languageEnglish
Article number7740048
Pages (from-to)648-651
Number of pages4
JournalIEEE Communications Letters
Issue number3
Publication statusPublished - 2017 Mar

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) funded by the Korea Government (MSIP) under Grant 2014R1A2A1A10049769 and 2015R1C1A1A02036927.

Publisher Copyright:
© 1997-2012 IEEE.


  • Simultaneous wireless information and power transfer (SWIPT)
  • power splitting (PS)
  • relay

ASJC Scopus subject areas

  • Modelling and Simulation
  • Computer Science Applications
  • Electrical and Electronic Engineering


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