In this paper, the covert communication system with the assistance of an active intelligent
reflecting surface (IRS) is investigated. Unlike the conventional passive IRS, which reflects …

In this paper, we investigate the performance of covert communications in different types of a
relay system: decode-and-forward (DF), compress-and-forward (CF) and amplify-and …

In this paper, unmanned aerial vehicle (UAV) and reconfigurable intelligent surfaces (RIS)
are combined together to further enhance the covert communication system. In particular, a …

Short-packet communications are applied to various scenarios where transmission
covertness and reliability are crucial due to the open wireless medium and finite blocklength …

Wireless short-packet communications pose challenges to the reliability and security of the
transmission. Besides, the proactive warder compounds these challenges, who detects and …

This paper focuses on the covert communication in a two-hop relay system consisting of a
transmitter, a relay, a receiver and a warden, where the relay can flexibly select between the …

Covert communication is crucial to ensure the safety of wireless communications in Internet
of Things (IoT) systems. In this article, a multiantenna relay is employed to enhance the …

This article investigates a dual-unmanned aerial vehicle (UAV)-assisted short-packet covert
communication system in the presence of a warden. Specifically, one flying UAV serves as …

In this paper, we study covert communications strategies in a compress-and-forward (CF)
relay system. Along with a public message to a destination node via a CF relay, a source …

This article investigates the covert performance of the finite block length device-to-device
(D2D) transmission between the multiantenna transceivers assisted by a decode-and …