STAR-RIS Aided Covert Communication
Han Xiao, Xiaoyan Hu, Pengcheng Mu, Wenjie Wang, Tong-Xing, Zheng, Kai-Kit Wong, Kun Yang

TL;DR
This paper proposes a STAR-RIS-assisted multi-antenna covert communication scheme that maximizes covert rate while ensuring covertness against a warden, using an iterative beamforming optimization algorithm.
Contribution
It introduces a novel STAR-RIS-assisted covert communication framework with a closed-form DEP expression and an iterative GCMMA-based optimization algorithm.
Findings
STAR-RIS significantly improves covert communication performance
The proposed scheme achieves higher covert rates than conventional RIS
The optimization algorithm effectively balances covertness and QoS constraints
Abstract
This paper investigates the multi-antenna covert communications assisted by a simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS). In particular, to shelter the existence of communications between transmitter and receiver from a warden, a friendly full-duplex receiver with two antennas is leveraged to make contributions to confuse the warden. Considering the worst case, the closed-form expression of the minimum detection error probability (DEP) at the warden is derived and utilized as a covert constraint. Then, we formulate an optimization problem maximizing the covert rate of the system under the covertness constraint and quality of service (QoS) constraint with communication outage analysis. To jointly design the active and passive beamforming of the transmitter and STAR-RIS, an iterative algorithm based on globally convergent version of method of…
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Taxonomy
TopicsAdvanced Wireless Communication Technologies · Wireless Communication Security Techniques · Privacy-Preserving Technologies in Data
