Results 51 to 60 of about 2,964,809 (287)
Research of Dynamic Wide-gap Frequency Hopping Sequences in Dynamic Spectrum Anti-jamming System [PDF]
Jisuanji gongcheng, 2018 The existing Frequency Hopping(FH) sequence can not be directly applied to a dynamic spectrum anti-interference system due to poor statistical performance and difficulty in real-time changes of communication parameters.Therefore,a FH sequence suitable ...
LI Shengnan,LI Yonggui,NIU Yingtao,YAN Yan,LUO Jianxiang
doaj
Frequency-Hopping Wave Engineering with Metasurfaces
, 2023 Wave phenomena can be artificially engineered by scattering from metasurfaces, which aids in the design of radio-frequency and optical devices for wireless communication, sensing, imaging, wireless power transfer and bio/medical applications.
Daisuke Nita (16541400) +4 more
core +1 more source
Advanced Functional Materials, EarlyView.Polarity‐matched Zr–MOFs program Nafion's nanoscale morphology during solution casting. Hydrophilic UiO‐66 preserves hydrated pathways, while hydrophobic UiO‐67 increases the proton hopping sites by densifying ionic clusters. Combining both fillers yields a membrane that delivers 176 mS cm−1 conductivity, reaches 1.46 W cm−2 under 200 kPa, and triples ...
Yonghwi Cho +13 more
wiley +1 more source
A Novel Frequency-Hopping Sequence for Covert Communication
IEEE Access, 2017 In this paper, a novel frequency-hopping sequence with lower probability of detection is proposed for covert communication systems. By formulating and solving a constrained optimization problem, a probability vector aiming for covert communication is ...
Ben Ning, Lei Guan, Haiyan Huang
doaj +1 more source
Advanced Functional Materials, EarlyView.This perspective presents recent advances in electrocatalytic nitrate reduction, focusing on reaction mechanisms, catalyst design, and electrolyzer configurations. Key challenges in selectivity, stability, and practical wastewater treatment are highlighted, while future directions for advancing sustainable ammonia synthesis and nitrate remediation are ...
Xintong Li +9 more
wiley +1 more source
Big Data and Cognitive ComputingIn wireless communication, information security, and anti-interference technology, modulation recognition of frequency-hopping signals has always been a key technique.
Mengxuan Lan +2 more
doaj +1 more source
Design and implementation of coherent FFH generator based on multiple parallel DDS
Dianzi Jishu Yingyong, 2018 For the new types of features of interference such as large interference power, wide frequency band and many styles, the adoption of a coherent fast frequency hopping system can improve the anti-interference ability of wireless communication systems.
Ni Xuanhao, Cong Yanchao, Wu Chunfei
doaj +1 more source
IET Communications, 2012 Most of previous blind parameter estimation methods of frequency hopping (FH) signals with a single channel do not adapt to overlapped signals, whereas the multi-channel-based ones are computationally much too expensive. Moreover, all the single- and multiple-channel-based methods use batch processing techniques, and they are not able to give real-time
Zhang-Meng Liu +2 more
openaire +2 more sources
Advanced Functional Materials, EarlyView.Inspired by skeletal muscles’ precision and endurance, CoilLCE integrates a self‐sensing liquid crystal elastomer/graphene artificial muscle with an embedded Joule‐heating copper coil, enabling closed‐loop multistage actuation with programmable intermediate states (strain accuracy of 2%), and antagonistic coordination (32% total strain). These features
Ziyun Zhang +9 more
wiley +1 more source
Low‐cost message‐driven frequency‐hopping scheme based on slow frequency‐hopping
IET Communications, 2018 This study presents a novel message‐driven frequency‐hopping (MDFH) scheme leveraging slow frequency‐hopping (FH). Since the typical MDFH scheme requires a large amount of detectors to obtain the information that is transmitted through carrier frequency selection, the authors aim at a low‐cost MDFH implementation in this study.
Ben Ning +3 more
openaire +2 more sources