Intelligent Reflecting Surface Aided Multi-Antenna Secure Transmission

Zheng Chu, Wanming Hao, Pei Xiao, Jia Shi

Research output: Journal PublicationArticlepeer-review

219 Citations (Scopus)


In this letter, we propose intelligent reflecting surface (IRS) aided multi-antenna physical layer security. We present a power efficient scheme to design the secure transmit power allocation and the surface reflecting phase shift. It aims to minimize the transmit power subject to the secrecy rate constraint at the legitimate user. Due to the non-convex nature of the formulated problem, we propose an alternative optimization algorithm and the semidefinite programming (SDP) relaxation to deal with this issue. Also, the closed-form expression of the optimal secure beamformer is derived. Finally, simulation results are presented to validate the proposed algorithm, which highlights the performance gains of the IRS to improve the secure transmission.

Original languageEnglish
Article number8847342
Pages (from-to)108-112
Number of pages5
JournalIEEE Wireless Communications Letters
Issue number1
Publication statusPublished - Jan 2020
Externally publishedYes


  • Intelligent reflecting surface
  • phase shift
  • physical-layer secrecy
  • secure beamforming

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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