Beamforming and Power Splitting Designs for AN-Aided Secure Multi-User MIMO SWIPT Systems

Zhengyu Zhu, Zheng Chu, Ning Wang, Sai Huang, Zhongyong Wang, Inkyu Lee

Research output: Journal PublicationArticlepeer-review

92 Citations (Scopus)


In this paper, an energy harvesting scheme for a multi-user multiple-input-multiple-output secrecy channel with artificial noise (AN) transmission is investigated. Joint optimization of the transmit beamforming matrix, the AN covariance matrix, and the power splitting ratio is conducted to minimize the transmit power under the target secrecy rate, the total transmit power, and the harvested energy constraints. The original problem is shown to be non-convex, which is tackled by a two-layer decomposition approach. The inner layer problem is solved through semi-definite relaxation, and the outer problem, on the other hand, is shown to be a single-variable optimization that can be solved by 1-D line search. To reduce computational complexity, a sequential parametric convex approximation method is proposed to find a near-optimal solution. This paper is then extended to the imperfect channel state information case with norm-bounded channel errors. Furthermore, tightness of the relaxation for the proposed schemes is validated by showing that the optimal solution of the relaxed problem is rank-one. Simulation results demonstrate that the proposed SPCA method achieves the same performance as the scheme based on 1-D but with much lower complexity.

Original languageEnglish
Article number7962221
Pages (from-to)2861-2874
Number of pages14
JournalIEEE Transactions on Information Forensics and Security
Issue number12
Publication statusPublished - Dec 2017
Externally publishedYes


  • Multi-user MIMO
  • artificial noise
  • physical layer security
  • power splitting
  • simultaneous wireless information and power transfer

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Computer Networks and Communications


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