A low complexity antenna switching for joint wireless information and energy transfer in MIMO relay channels

Ioannis Krikidis, Shigenobu Sasaki, Stelios Timotheou, Zhiguo Ding

Research output: Contribution to journalArticlepeer-review

148 Scopus citations

Abstract

In this paper, we investigate a low-complexity technique for simultaneous wireless information and energy transfer in multiple-input multiple-output relay channels. The proposed technique exploits the array configuration at the relay node and uses the antenna elements either for conventional decoding or for rectifying (rectennas). In order to keep the complexity low, a dynamic antenna switching between decoding/rectifying is proposed based on the principles of the generalized selection combiner (GSC); the L strongest paths are allocated for decoding while the remaining channel paths for rectifying (and vice versa). The optimal L as well as the allocation strategy that minimizes the outage probability are investigated via theoretical and numerical results. In addition, two performance bounds that provide the optimal performance without the limitation of GSC are proposed by solving a linear programming and a binary knapsack problem, respectively. The proposed technique is extended to scenarios with multi-user interference, where a zero-forcing receiver is used at the relay node; closed-forms expressions for the outage probability are also derived.

Original languageBritish English
Article number6804407
Pages (from-to)1577-1587
Number of pages11
JournalIEEE Transactions on Communications
Volume62
Issue number5
DOIs
StatePublished - May 2014

Keywords

  • generalized selection combiner
  • MIMO relay channel
  • optimization
  • RF energy harvesting
  • Zero-forcing

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