Joint transmit power and reflection beamforming design for IRS-aided covert communications

Document Type

Conference Proceeding

Publication Title

2021 IEEE Global Communications Conference (GLOBECOM)

Publisher

IEEE

School

School of Science

RAS ID

45103

Funders

National Natural Science Foundation of China / Natural Science Research Project of Education Departmnet of Anhui Province of China

Comments

Zhou, X., Yan, S., Wu, Q., Shu, F., & Ng, D. W. K. (2021, December). Joint transmit power and reflection beamforming design for IRS-aided covert communications [Paper presentation]. 2021 IEEE Global Communications Conference (GLOBECOM), Madrid, Spain. https://doi.org/10.1109/GLOBECOM46510.2021.9685483

Abstract

This work examines the performance gain achieved by deploying an intelligent reflecting surface (IRS) for delay-constrained covert communications. To this end, we formulate the joint design of the transmit power and the IRS reflection coefficients, including its phase shifts and reflection amplitudes, to maximize the communication quality subject to a covertness constraint. We first prove that perfect covertness is achievable with the aid of the IRS even for a single-antenna transmitter, which is impossible without the IRS. Then, we develop a penalty-based successive convex approximation (PSCA) algorithm to tackle the design optimization problem. Considering the high complexity of the PSCA algorithm, we further propose a low-complexity two-stage algorithm, where closed-form expressions for the transmit power and the IRS's reflection coefficients are derived. Our examination shows that significant performance gain can be achieved by deploying an IRS into covert communications.

DOI

10.1109/GLOBECOM46510.2021.9685483

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