Secure transmission for intelligent reflecting surface-assisted mmWave and terahertz systems
Type
ArticleAuthors
Qiao, Jingping
Alouini, Mohamed-Slim

KAUST Department
Communication Theory LabComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program
Date
2020-06-18Online Publication Date
2020-06-18Print Publication Date
2020-10Submitted Date
2020-04-17Permanent link to this record
http://hdl.handle.net/10754/665686
Metadata
Show full item recordAbstract
This letter focuses on the secure transmission for an intelligent reflecting surface (IRS)-assisted millimeter-wave (mmWave) and terahertz (THz) system, in which a base station (BS) communicates with its destination via an IRS, in the presence of a passive eavesdropper. To maximize the system secrecy rate, the transmit beamforming at the BS and the reflecting matrix at the IRS are jointly optimized with transmit power and discrete phase-shift constraints. It is first proved that the beamforming design is independent of the phase shift design under the rank-one channel assumption. The formulated non-convex problem is then converted into two subproblems, which are solved alternatively. Specifically, the closed-form solution of transmit beamforming at the BS is derived, and the semidefinite programming (SDP)-based method and element-wise block coordinate descent (BCD)-based method are proposed to design the reflecting matrix. The complexity of our proposed methods is analyzed theoretically. Simulation results reveal that the proposed IRS-assisted secure strategy can significantly boost the secrecy rate performance, regardless of eavesdropper's locations (near or blocking the confidential beam).Citation
Qiao, J., & Alouini, M.-S. (2020). Secure Transmission for Intelligent Reflecting Surface-Assisted mmWave and Terahertz Systems. IEEE Wireless Communications Letters, 9(10), 1743–1747. doi:10.1109/lwc.2020.3003400arXiv
2005.13451Additional Links
https://ieeexplore.ieee.org/document/9120206/ae974a485f413a2113503eed53cd6c53
10.1109/LWC.2020.3003400