Achieving energy diversity with multiple energy harvesting relays

Yaming Luo, Jun Zhang, Khaled B. Letaief

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

7 Citations (Scopus)

Abstract

Energy harvesting (EH) has recently emerged as a promising technology for next-generation green wireless networks, as it can power communication nodes with renewable energy. However, it is challenging to provide satisfactory performance in such systems, due to the sporadic energy arrival and the low harvesting rate. In this paper, we propose a novel cooperation strategy for EH networks with the help of multiple EH relays, each of a steady but low harvesting rate. Different relays will take turns to assist the source-destination transmission, and thus energy diversity can be achieved. To provide steady communications, we formulate the design problem as to maximize the minimum utility during the considered transmission duration, which, however, is NP-hard. We propose a general framework to develop efficient suboptimal algorithms, which consists of 1) a sufficient condition for the feasibility of the optimization problem and 2) an efficient bisection algorithm to find a suboptimal solution. Simulation results will show that the proposed cooperation strategy can provide significant power gains over the direct link transmission, and the proposed suboptimal algorithm can provide near-optimal performance. Compared to the best-effort cooperation that only optimizes the current transmission block, the proposed strategy can achieve the same performance with much fewer relays.

Original languageEnglish
Title of host publication2014 6th International Conference on Wireless Communications and Signal Processing, WCSP 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479973392
DOIs
Publication statusPublished - 18 Dec 2014
Externally publishedYes
Event2014 6th International Conference on Wireless Communications and Signal Processing, WCSP 2014 - Hefei, China
Duration: 23 Oct 201425 Oct 2014

Publication series

Name2014 6th International Conference on Wireless Communications and Signal Processing, WCSP 2014

Conference

Conference2014 6th International Conference on Wireless Communications and Signal Processing, WCSP 2014
Country/TerritoryChina
CityHefei
Period23/10/1425/10/14

Keywords

  • cooperative communications
  • Energy harvesting
  • power assignment
  • relay selection

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Signal Processing

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