Results 71 to 80 of about 3,586 (255)

RIS Empowered Near-Field Covert Communications

This paper studies an extremely large-scale reconfigurable intelligent surface (XL-RIS) empowered covert communication system in the near-field region. Alice covertly transmits messages to Bob with the assistance of the XL-RIS, while evading detection by
Liu, Yuanwei, Zhou, Xiangyun, Yang, Gang, Liu, Jun   +3 more
core   +1 more source

Wireless Covert Communication with Polarization Dirty Constellation

, 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, Xiaopeng Ji, Sen Qiao
core   +1 more source

Tunable Dynamics via Dual‐Ion Modulation for Event‐based Data Processing Using a Highly Uniform and Self‐Rectifying Memristor Array

Advanced Science, EarlyView.
Tunable dynamics of an interface‐type memristor array enabled by dual‐ion modulation through Ag nanoclusters are demonstrated. A 32 × 32 one‐resistor (1R) array exhibits 100% yield with high temporal/spatial uniformity (<3%) and a rectification ratio of 105.
Yoonho Cho, Dawon Kim, Jeonghong Lee, Dae‐won Kim, See‐On Park, Jongmin Bae, Taehwan Jang, Shinhyun Choi   +7 more
wiley   +1 more source

A Skull Bone Marrow‐to‐Brain Axis Links Osteoblastic Activity to Myeloid Cell Trafficking, Cerebral Blood Flow, and Cognition in Alzheimer's Progression

Advanced Science, EarlyView.
This study reveals that Alzheimer's disease–linked APP expression in bone‐forming cells drives skull bone marrow remodeling and alters its vascular connections to the brain. These changes disrupt immune cell trafficking, cerebral blood flow, and cognition. Targeting bone marrow macrophages restores brain function, highlighting a previously unrecognized
Lei Xiong, Dong Sun, Hao‐Han Guo, Daehoon Lee, Zhipeng Liu, Lin Mei, Wen‐Cheng Xiong   +6 more
wiley   +1 more source

STAR-RIS Aided Covert Communications [PDF]

This paper investigates the multi-antenna covert communications assisted by a simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS).
Wang, W, Mu, P, Yang, K, Hu, X, Zheng, TX, Wong, KK, Xiao, H   +6 more
core  

Error exponent for covert communications over discrete memoryless channels

, 2017
International audienceWe define and study the error exponent of covert communications over binary-input Discrete Memoryless Channels (DMCs). Our main result consists of upper and lower bounds for the exponent, which match in a regime that we explicitly ...
Bloch, Matthieu, Mehrdad Tahmasbi, Tahmasbi, Mehrdad, Tan, Vincent,, Tan, Vincent, Y.F., Matthieu R. Bloch, Vincent Y. F. Tan   +6 more
core   +1 more source

Adversarial Machine Learning for NextG Covert Communications Using Multiple Antennas. [PDF]

Entropy (Basel), 2022
Kim B, Sagduyu Y, Davaslioglu K, Erpek T, Ulukus S.   +4 more
europepmc   +1 more source

On Performance of FAS-Aided Covert Communications

2025 IEEE 101st Vehicular Technology Conference (VTC2025-Spring)
This paper investigates the impact of deploying the fluid antenna system (FAS) on the performance of covert communications. In particular, we focus on a scenario where a transmitter seeks to covertly communicate with a receiver, while a warden attempts to detect the transmission. Both the receiver and the warden are assumed to utilize planar FAS.
Farshad Rostami Ghadi, Masoud Kaveh, Riku Jäntti, Francisco Javier López-Martínez   +3 more
openaire   +2 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 ...
openaire   +2 more sources

Metasurface‐Enabled Active‐Like Passive Radar

Advanced Science, EarlyView.
A programmable space‐time‐coding metasurface embeds distinct spatiotemporal tags into ambient wireless signals, allowing passive radar to operate in an active‐like manner. By enabling code‐correlated reconstruction under interference, the approach supports robust real‐time UAV tracking in complex environments and points to intelligent, low‐power ...
Mingyi Li, Jiawen Xu, Hanting Zhao, Xu Zhao, Yanjin Chen, Tie Jun Cui, Vincenzo Galdi, Lianlin Li   +7 more
wiley   +1 more source