Throughput maximization for two-hop energy harvesting communication systems

Yaming Luo, Jun Zhang, Khaled B. Letaief

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

9 Citations (Scopus)


Energy harvesting (EH) has recently emerged as a promising technique for green communications. To realize its potential, communication protocols need to be redesigned to combat the randomness of the harvested energy. In this paper, we investigate how to apply relaying to improve the short-term performance of EH communication systems. With an EH source and a non-EH half-duplex relay, we consider the problem of maximizing the achievable rate for a given time duration. The half-duplex constraint at the relay renders the design problem quite challenging, as the source and relay transmission periods should be carefully scheduled. Moreover, the adaptive power allocation is needed at the source to combat the random energy arrivals. A key finding is that the optimal power allocation algorithm, called directional water-filling (DWF), for the single-hop EH system can serve as guideline for the design of a two-hop communication system, as it not only provides an achievable performance upper bound, but also forms the basis to derive the optimal solution for our design problem. Based on a modified energy profile according to the DWF power allocation, we derive key properties of the optimal solution and thereafter propose an efficient algorithm to maximize the throughput. Simulation results show that both scheduling and power allocation optimizations are necessary in two-hop EH communication systems.

Original languageEnglish
Title of host publication2013 IEEE International Conference on Communications, ICC 2013
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages5
ISBN (Print)9781467331227
Publication statusPublished - 1 Jan 2013
Externally publishedYes
Event2013 IEEE International Conference on Communications, ICC 2013 - Budapest, Hungary
Duration: 9 Jun 201313 Jun 2013

Publication series

NameIEEE International Conference on Communications
ISSN (Print)1550-3607


Conference2013 IEEE International Conference on Communications, ICC 2013

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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