Information and Energy Cooperation in Overlay Hierarchical Cognitive Radio Networks

Kun Yueh Hsieh, Fan Shuo Tseng, Meng Lin Ku, Chao Yuan Hsu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

In overlay hierarchical cognitive radio (HCR) networks, the primary system (PS) and the secondary system (SS) can cooperate to exploit the spectrum resource more efficiently. In this paper, we propose a new HCR, in which an energy harvesting (EH) device is additionally deployed at the primary receiver (PR) such that the PS can not only share the spectrum resources with the SS, but also harvest energy from the SS, achieving a new simultaneous wireless information and power transfer (SWIPT) paradigm. In the considered structure, the secondary base station (SB) can help relay the PS's signal via an amplify-and-forward (AF) protocol, and a power splitting EH device is adopted at the PR. A cooperative strategy is proposed for maximizing the efficiency of the information and power transfer. We optimize two precoders at the SB (for the PS and SS, respectively) and the power splitting factor for the PR. Since the optimization problem is non-convex, it is a real challenge. To facilitate the optimization process, a precoding structure is first proposed to reduce the number of parameters. The resultant optimization problem can then be equivalently solved using a semidefinite relaxation (SDR) approach. Numerical results show that the proposed strategy provides a promising improvement for information and energy cooperation, as compared with existing methods.

Original languageEnglish
Title of host publicationICUFN 2018 - 10th International Conference on Ubiquitous and Future Networks
PublisherIEEE Computer Society
Pages274-279
Number of pages6
ISBN (Print)9781538646465
DOIs
StatePublished - 14 Aug 2018
Event10th International Conference on Ubiquitous and Future Networks, ICUFN 2018 - Prague, Czech Republic
Duration: 3 Jul 20186 Jul 2018

Publication series

NameInternational Conference on Ubiquitous and Future Networks, ICUFN
Volume2018-July
ISSN (Print)2165-8528
ISSN (Electronic)2165-8536

Conference

Conference10th International Conference on Ubiquitous and Future Networks, ICUFN 2018
Country/TerritoryCzech Republic
CityPrague
Period3/07/186/07/18

Keywords

  • Amplify-and-forward (AF)
  • Convex optimization
  • Energy harvesting (EH)
  • Hierarchical radio networks (HCRs)
  • Overlay
  • Semidefinite relaxation (SDR)

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