Robust Beamforming Designs in Secure MIMO SWIPT IoT Networks with a Nonlinear Channel Model

Zhengyu Zhu, Ning Wang, Wanming Hao, Zhongyong Wang, Inkyu Lee

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

In this article, we study a robust beamforming design for multiuser multiple-input-multiple-output secrecy networks with simultaneous wireless information and power transfer (SWIPT). In this system, an access point, multiple Internet-of-Things (IoT) devices under the nonlinear energy harvesting (EH) model with a help of one cooperative jammer (CJ). We employ artificial noise (AN) generation to facilitate efficient wireless energy transfer and secure transmission. To achieve EH fairness, we aim to maximize the minimum harvested energy among users subject to secrecy rate constraint and total transmit power constraint in the presence of channel estimation errors. By incorporating a norm-bounded channel uncertainty model, the original robust problem is transformed into a two-layer optimization problem, where the inner layer problem is reformulated as semidefinite programming (SDP) and the outer layer problem is solved by a one-dimensional (1-D) line search algorithm. In addition, in order to reduce computational complexity, we propose an algorithm based on sequential parametric convex approximation (SPCA). Finally, simulation results show that the proposed SPCA method achieves the same performance as the two-layer algorithm with much lower complexity.

Original languageEnglish
Article number9162099
Pages (from-to)1702-1715
Number of pages14
JournalIEEE Internet of Things Journal
Volume8
Issue number3
DOIs
Publication statusPublished - 2021 Feb 1

Keywords

  • Internet of Things
  • nonlinear energy harvesting
  • physical-layer security
  • robust beamforming
  • simultaneous wireless information and power transfer

ASJC Scopus subject areas

  • Signal Processing
  • Information Systems
  • Hardware and Architecture
  • Computer Science Applications
  • Computer Networks and Communications

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