AN-aided secure beamforming in power-splitting-enabled SWIPT MIMO heterogeneous wireless sensor networks

Weili Ge, Zhengyu Zhu, Wanming Hao, Yi Wang, Zhongyong Wang, Qiong Wu, Zheng Chu

Research output: Journal PublicationArticlepeer-review

3 Citations (Scopus)


In this paper, we investigate the physical layer security in a two-tier heterogeneous wireless sensor network (HWSN) depending on simultaneous wireless information and power transfer (SWIPT) approach for multiuser multiple-input multiple-output wiretap channels with artificial noise (AN) transmission, where a more general system framework of HWSN only includes a macrocell and a femtocell. For the sake of implementing security enhancement and green communications, the joint optimization problem of the secure beamforming vector at the macrocell and femtocell, the AN vector, and the power splitting ratio is modeled to maximize the minimal secrecy capacity of the wiretapped macrocell sensor nodes (M-SNs) while considering the fairness among multiple M-SNs. To reduce the performance loss of the rank relaxation from the SDR technique while solving the non-convex max–min program, we apply successive convex approximation (SCA) technique, first-order Taylor series expansion and sequential parametric convex approximation (SPCA) approach to transform the max–min program to a second order cone programming (SOCP) problem to iterate to a near-optimal solution. In addition, we propose a novel SCA-SPCA-based iterative algorithm while its convergence property is proved. The simulation shows that our SCA-SPCA-based method outperforms the conventional methods.

Original languageEnglish
Article number459
JournalElectronics (Switzerland)
Issue number4
Publication statusPublished - Apr 2019
Externally publishedYes


  • Heterogeneous wireless sensor networks
  • Physical-layer secrecy
  • Secure beamforming
  • Successive convex approximation

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Signal Processing
  • Hardware and Architecture
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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