Results 11 to 20 of about 13,309 (290)
Covert Communication With Relay Selection [PDF]
IEEE Wireless Communications Letters, 2021 In this letter, we investigate covert communication in relay networks with relay selection. We consider the scenario that while forwarding the source’s message, the selected relay opportunistically transmits its own message to the destination covertly. We derive the probability of detection error (PDE) and the average covert rate (ACR) in a closed form,
Yinjie Su, , Zhenkai Zhang
exaly +5 more sources
Wireless Covert Communication with Polarization Dirty Constellation
Applied Sciences, 2023 Wireless covert communication is an emerging communication technique that prevents eavesdroppers. This paper presents a novel approach to wireless covert communication based on polar codes with dirty constellation polarization.
Mingyu Hu, Sen Qiao, Xiaopeng Ji
doaj +2 more sources
Covert Communication with Cognitive Jammer Embedded in Public Communication System [PDF]
SensorsIn this work, we investigate covert communication with a cognitive jammer (CJ) embedded in a public communication system. Specifically, while the transmitter continuously transmits public messages to the receiver, it may also transmit its covert messages
Xiangyu Zhao +4 more
doaj +2 more sources
Optimization of Covert Communication in Multi-Sensor Asymmetric Noise Systems [PDF]
SensorsThis work investigates wireless covert communication in a multi-sensor asymmetric noise scenario. We adopt KL (Kullback–Leibler) divergence as the covertness constraint metric and mutual information as the transmission rate metric.
Sen Qiao +4 more
doaj +2 more sources
On IRS-Assisted Covert Communication with a Friendly UAV
Drones, 2023 Driven by the rapidly growing demand for information security, covert wireless communication has become an essential technology and attracted tremendous attention.
Xiaobei Xu +6 more
doaj +3 more sources
Covert communication in relay and RIS networks [PDF]
Security and Safety, 2023 Covert communication aims to prevent the warden from detecting the presence of communications, i.e. with a negligible detection probability. When the distance between the transmitter and the legitimate receiver is large, large transmission power is needed, which in turn increases the detection probability. Relay is an effective technique to tackle this
Jinsong Hu 0001 +4 more
core +4 more sources
Time-Division Multiplexed Optical Covert Communication System Based on Gain-Switched Optical Pulses
PhotonicsIn optical covert communication systems based on gain-switched distributed feedback semiconductor lasers, the trade-off between the modulation frequency and the spectral imperceptibility limits the bit rate of the secure channel.
Dong Liu +4 more
doaj +2 more sources
Covert Multi-Access Communication with a Non-Covert User
ICC 2024 - IEEE International Conference on CommunicationsIn this paper, we characterize the fundamental limits of a communication system with three users (i.e., three transmitters) and a single receiver where communication from two covert users must remain undetectable to an external warden. Our results show a tradeoff between the highest rates that are simultaneously achievable for the three users.
Abdelaziz Bounhar +2 more
openaire +3 more sources
On Gaussian covert communication in continuous time [PDF]
EURASIP Journal on Wireless Communications and Networking, 2019 Abstract The paper studies covert communication over a continuous-time Gaussian channel. The covertness condition requires that the channel output must statistically resemble pure noise. When the additive Gaussian noise is “white” over the bandwidth of interest, a formal coding theorem is proven, extending earlier results on covert ...
Wang, Ligong
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STAR-RIS Aided Covert Communications
GLOBECOM 2023 - 2023 IEEE Global Communications Conference, 2023 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 ...
Han Xiao +6 more
openaire +3 more sources