Joint Wireless Information and Power Transfer for an Autonomous Multiple Antenna Relay System

Yang Huang, Bruno Clerckx

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


Considering a three-node multiple antenna relay system, this letter proposes a two-phase amplify-and-forward (AF) relaying protocol, which enables the autonomous relay to simultaneously harvest wireless power from the source information signal and from an energy signal conveyed by the destination. We first study this energy-flow-assisted (EFA) relaying in a single-input single-output (SISO) relay system and aim at maximizing the rate. By transforming the optimization problem into an equivalent convex form, a global optimum can be found. We then extend the protocol to a multiple antenna relay system. The relay processing matrix is optimized to maximize the rate. The optimization problem can be efficiently solved by eigenvalue decomposition, after linear algebra manipulation. It is observed that the benefits of the energy flow are interestingly shown only in the multiple antenna case, and it is revealed that the received information signal and the energy leakage at the relay can be nearly separated by making use of the signal space, such that the desired signal can be amplified with a larger coefficient.

Original languageEnglish
Article number7098350
Pages (from-to)1113-1116
Number of pages4
JournalIEEE Communications Letters
Issue number7
Publication statusPublished - 2015 Jul 1

Bibliographical note

Funding Information:
The work of Y. Huang was supported by China Scholarship Council (CSC) Imperial Scholarship. The associate editor coordinating the review of this paper and approving it for publication was D. Michalopoulos.

Publisher Copyright:
© 2015 IEEE.


  • Energy harvesting
  • amplify-and-forward (AF)
  • multiple antenna relay
  • relay network

ASJC Scopus subject areas

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


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