Global Energy Efficiency in Secure MISO SWIPT Systems with Non-Linear Power-Splitting EH Model

Yang Lu, Ke Xiong, Pingyi Fan, Zhiguo Ding, Zhangdui Zhong, Khaled Letaief

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This paper considers a MISO simultaneous wireless information and power transfer (SWIPT) system where one transmitter serves multiple authorized receivers in presence of several potential eavesdroppers (idle receivers). To prevent the information interception by eavesdroppers, artificial noise (AN) is embedded into the transmit signals. The non-linear energy harvesting (EH) model is adopted and a novel power-splitting (PS) EH receiver architecture is proposed. Stochastic uncertainty channel model (SUM) is considered for the idle receivers due to outdated channel feedback. A global energy efficiency (GEE) maximization problem is formulated by jointly optimizing the transmit beamforming vectors, the AN covariance matrix and the PS ratios, under the minimal rate and secure transmission constraints of authorized receivers, the EH requirement constraints of idle receivers and the total available power constraint at the transmitter. Since the problem is non-convex with no known solution, it is solved based on the following solution framework. Firstly, the PS ratios are optimized by using bisection method and successive convex approximation (SCA) and then, the transmit beamforming vectors and the AN covariance matrix are jointly optimized by using a Dinkelbach’s Algorithm based method where SCA is applied to solve its inner subproblem. It is theoretically proved that by involving AN, the system GEE can be improved. Numerous results show that system GEE first increases and then keeps unchanged with the increment of the total available power, but it first keeps unchanged and then decreases with the increment of the minimal rate requirement. It is also observed that compared with traditional EH receiver architecture and linear EH model, our proposed PS EH receiver architecture is able to achieve higher GEE and avoid false output power at idle receivers.

Original languageEnglish
JournalIEEE Journal on Selected Areas in Communications
DOIs
Publication statusAccepted/In press - 1 Jan 2018
Externally publishedYes

Fingerprint

Energy harvesting
Energy efficiency
Beamforming
Covariance matrix
Transmitters
Feedback

Keywords

  • Energy efficiency
  • fractional programming
  • MISO
  • non-linear EH model
  • PS EH receiver architecture
  • successive convex approximation
  • SWIPT

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

Cite this

Global Energy Efficiency in Secure MISO SWIPT Systems with Non-Linear Power-Splitting EH Model. / Lu, Yang; Xiong, Ke; Fan, Pingyi; Ding, Zhiguo; Zhong, Zhangdui; Letaief, Khaled.

In: IEEE Journal on Selected Areas in Communications, 01.01.2018.

Research output: Contribution to journalArticle

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