Optimal Target Secrecy Rate and Power Allocation Policy for a SWIPT System over a Fading Wiretap Channel

Hongyan Yu, Songtao Guo, Yuanyuan Yang, Bin Xiao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

The simultaneous wireless information and power transfer (SWIPT) technique is regarded as a promising approach to enhance performance of wireless networks with limited energy supply. However, due to the broadcast nature of wireless radio, the energy receiver may act as a potential eavesdropper to eavesdrop the information sent to the information receiver. To address this issue, in this paper, we propose an optimization framework of the target secrecy rate and the power allocation ratio based on the secrecy outage probability and the effective secrecy throughput in the SWIPT system over fading wiretap channel. Moreover, we derive the closed-form expression of the secrecy outage probability and the effective secrecy throughput for two secrecy transmission modes. Furthermore, we formulate the effective secrecy throughput maximization problem under the reliability constraint in the on-off and adaptive transmission modes and provide the closed-form optimal solutions of the power allocation ratio and the target secrecy rate. Finally, we provide numerical results that give an insight into the effect of various system parameters on the secrecy outage probability and the effective secrecy throughput, such as the target secrecy rate, the power allocation ratio, and average gains of the main channel and the eavesdropper channel.

Original languageEnglish
Article number4267003
Pages (from-to)3291-3302
Number of pages12
JournalIEEE Systems Journal
Volume12
Issue number4
DOIs
Publication statusPublished - 1 Dec 2018

Keywords

  • Effective secrecy throughput (EST)
  • physical layer security
  • power allocation ratio
  • secrecy outage probability
  • simultaneous wireless information and power transfer (SWIPT) systems
  • target secrecy rate

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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