Results 51 to 60 of about 7,286 (186)

Eavesdropping on GSM: state-of-affairs [PDF]

, 2010
In the almost 20 years since GSM was deployed several security problems have been found, both in the protocols and in the - originally secret - cryptography.
Broek, Fabian van den
core   +1 more source

A USRP implementation of wiretap lattice codes [PDF]

2014 IEEE Information Theory Workshop (ITW 2014), 2014
A wiretap channel models a communication channel between a legitimate sender Alice and a legitimate receiver Bob in the presence of an eavesdropper Eve. Confidentiality between Alice and Bob is obtained using wiretap codes, which exploit the difference between the channels to Bob and to Eve.
Lu, Jinlong, Harshan, J., Oggier, Frédérique   +2 more
openaire   +2 more sources

First Coincident Radar and Optical Observations of a Meteor Radio Afterglow

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract It has been hypothesized that Meteor Radio Afterglows (MRAs) occur due to resonant transition radiation (RTR) where suprathermal electrons emit as they pass through electron density inhomogeneities in a turbulent plasma. Meteor trails are thought to produce suprathermal electrons through anion oxidation, which can be identified through meteor ...
K. S. Obenberger, J. L. Chau, J. Vierinen, D. Vida, L. E. Cordonnier, Z. Balint, M. Clahsen, E. Dao, J. Dowell, J. M. Holmes, R. F. Kelly, D. Kastinen, N. Pfeffer, K. Robinson, G. B. Taylor, J. M. Urco   +15 more
wiley   +1 more source

Interference Diagnosis in Wireless Systems by using NI USRP [PDF]

International Journal of Simulation Systems Science & Technology, 2020
In both industrial and domestic environments, there will be a large increase of wireless communication systems. The density of wireless devices and need of additional bandwidth is expanding which is increasing the wireless interference. Interference emerges from unintended radiators is the main cause of degrading the Electromagnetic Compatibility and ...
openaire   +1 more source

Demonstrating the practical challenges of wireless communications using USRP [PDF]

IEEE Communications Magazine, 2014
Wireless communications is taught in most electronics degree curricula worldwide, where the main focus is the theory of communications. While it is essential that students learn the theory of communications, this is not enough to prepare them for their careers in industry. This is due to the fact that there are several practical challenges in designing
El-Hajjar, Mohammed, Nguyen, Quoc, Maunder, Robert G., Ng, Soon Xin   +3 more
openaire   +3 more sources

A Smart Magnetically Actuated Flip‐Disc Programmable Metasurface with Ultralow Power Consumption for Real‐Time Channel Control

Advanced Functional Materials, Volume 36, Issue 15, 19 February 2026.
The study proposes a 1‐bit programmable metasurface based on flip‐disc display, named flip‐disc metasurface (FD‐MTS). This new design enables ultralow energy consumption while maintaining coding patterns. It also exhibits high scalability and multifunctional flexibility.
Jiang Han Bao, Che Liu, Jia Cheng Li, Zhen Hao Fu, Yi Su Huang, Si Qi Huang, Lei Zhang, Jian Wei You, Tie Jun Cui   +8 more
wiley   +1 more source

Rapid Diagnostics of Reconfigurable Intelligent Surfaces Using Space‐Time‐Coding Modulation

Advanced Functional Materials, Volume 36, Issue 1, 2 January 2026.
A fast reconfigurable‐intelligent‐surface (RIS) diagnostics method is proposed based on spatio‐temporal modulation with orthogonal codes. Theoretical analysis demonstrates a clear distinction in code channel power between normal and faulty elements. Simulations validate its feasibility under high fault ratios and varying receiving angles.
Yi Ning Zheng, Lei Zhang, Xiao Qing Chen, Marco Rossi, Giuseppe Castaldi, Shuo Liu, Tie Jun Cui, Vincenzo Galdi   +7 more
wiley   +1 more source

Pneumatically‐Actuated Liquid Metal‐Based Frequency Reconfigurable Antenna

Advanced Science, Volume 13, Issue 5, 27 January 2026.
A look at a flexible, frequency‐tuning antenna A Soft Solution: Introducing a new antenna design made with liquid metal composites. A Full Package: Combining flexible antennas with pneumatic actuators. End‐to‐End Control: Automatic reconfiguration according to signal strength.
Yiwen Song, Aditya Bharambe, Dinesh K. Patel, Barbara Zhuo, Mason Zadan, Carmel Majidi, Swarun Kumar   +6 more
wiley   +1 more source

Effect of ultrasonic rolling on local corrosion induced by second phase of 6061 aluminum alloy

Cailiao gongcheng, 2023
USRP (ultrasonic surface rolling processing) was used to change the surface layer of 6061 aluminum alloy, so as to realize the change of the second phase microstructure of 6061 aluminum alloy by USRP under different static pressure conditions to improve ...
FAN Lei, LI Bo, HE Jinhang, BAI Jie, MAO Jin, ZHANG Youjia, HUANG Chaowen, LI Wei, SHI Wei   +8 more
doaj   +1 more source

Spatial Identification Methods and Systems for RFID Tags [PDF]

, 2013
Disertační práce je zaměřena na metody a systémy pro měření vzdálenosti a lokalizaci RFID tagů pracujících v pásmu UHF. Úvod je věnován popisu současného stavu vědeckého poznání v oblasti RFID prostorové identifikace a stručnému shrnutí problematiky ...
Povalač, Aleš
core