Abstract
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 language | English |
|---|---|
| Article number | 8847342 |
| Pages (from-to) | 108-112 |
| Number of pages | 5 |
| Journal | IEEE Wireless Communications Letters |
| Volume | 9 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 2020 |
| Externally published | Yes |
Keywords
- Intelligent reflecting surface
- phase shift
- physical-layer secrecy
- secure beamforming
ASJC Scopus subject areas
- Control and Systems Engineering
- Electrical and Electronic Engineering