Results 51 to 60 of about 4,863,781 (309)

Probability of intercepting frequency hoping signals using modern search receivers

Vojnotehnički Glasnik, 2001
This article is intended to present the latest scientific findings about the interception of frequency hoping signals. The probability of intercepting frequency hopping signals by means of modern search receivers or scanning direction finders is ...
Slađan M. Svrzić , Dragan I. Ćosović   +1 more
doaj   +1 more source

Frequency Hopped Spread Spectrum Tutorial

, 2018
This article is about FHSS (Frequency Hopped Spread Spectrum) and one method suggested for Security improvement in it. In this report you can find an in depth information on FHSS from the basic level to the aim of the project. A detailed explanation is given about the Modulation, Frequency Hopping, PN-sequence generation, Frequency table w.r.t PN ...
openaire   +3 more sources

Time-Hopping Multicarrier Code-Division Multiple-Access

, 2006
A time-hopping multicarrier code-division multiple-access (TH/MC-CDMA) scheme is proposed and investigated. In the proposed TH/MC-CDMA each information symbol is transmitted by a number of time-domain pulses with each time-domain pulse modulating a ...
Yang, L.-L., Lie-liang Yang
core   +1 more source

Designing Vanadium‐Based Oxide Electrocatalysts for Water Splitting: Experimental and Mechanistic Insights with Machine Learning

Advanced Functional Materials, EarlyView.
This review establishes structure‐property‐mechanism relationships across six modification strategies for V‐based oxide water‐splitting electrocatalysts: lattice engineering, heteroatom doping, interface engineering, carbon‐based hybridization, morphology engineering, and surface reconstruction and pre‐catalyst design, where dissolution is reframed as ...
Youness El Issmaeli, Amina Lahrichi, Hoje Chun, Rafael Gómez‐Bombarelli, Bruno G. Pollet   +4 more
wiley   +1 more source

Implementasi Frequency Hopping Spread Spectrum (FHSS) pada DSK TMS320C6416T

Jurnal Teknik ITS, 2014
Teknik Spread Spectrum  (spektral tersebar) merupakan salah satu jenis teknik pengiriman sinyal yang tahan terhadap gangguan berupa noise maupun jamming.
Ocki Aditya Muhammad, Suwadi Suwadi, Titiek Suryani   +2 more
doaj  

New Families of Frequency-Hopping Sequence Sets with a Low-Hit-Zone

Entropy
As a means of spread spectrum communication, frequency-hopping technology has good performance in anti-jamming, multiple-access, security, covert communications, and so on.
Limengnan Zhou, Hanzhou Wu
doaj   +1 more source

Rapid Microwave Plasma Engineering of HfO2/C@C Core‐Shell Fibrous Membrane Toward Flexible High‐Performance Electromagnetic Wave Absorption

Advanced Functional Materials, EarlyView.
Rapid microwave plasma torch engineering tunes crystal phases, carbon graphitization and oxygen‐vacancy defects in HfO2/C@C core‐shell fibrous membranes. Synergistic multi‐loss effects optimize impedance matching to deliver −65.75 dB reflection loss and a 7.37 GHz effective bandwidth for flexible electromagnetic wave absorption.
Qichao Ding, Limeng Song, Wei Li, Jiangtao Hao, Xuewen Jiang, Mengru Li, Xinglai Yuan, Gang Wang, Yanqiu Zhu, Mi Tian, Hailong Wang, Hongxia Li, Biao Zhao, Rui Zhang, Bingbing Fan   +14 more
wiley   +1 more source

Fast and Multicarriar Frequency Hopping Signals overFrequency Selective Rayleigh Fading Channel

Journal of Engineering and Sustainable Development, 2006
In this paper, the performance of frequency hopping spread spectrum systems employing noncoherent reception and transmission diversity is analyzed for frequency selective Rayleigh fading (FSRF) channel. Two different types of frequency diversity systems,
Maher K. Al-Azawi, Maha George Zia, Amal M. Noori   +2 more
doaj  

Design of Anti-Jamming Waveforms for Time-Hopping Spread Spectrum Systems in Tone Jamming Environments [PDF]

IEEE Transactions on Vehicular Technology, 2019
We consider the problem of designing waveforms for mitigating single tone jamming (STJ) signals with an estimated jamming frequency in time-hopping spread spectrum (TH SS) systems.
Hyoyoung Jung, Binh Van Nguyen, Iickho Song, Kiseon Kim   +3 more
semanticscholar   +1 more source

Ground‐State Charge‐Transfer Doping in Donor–Acceptor Semiconducting Polymers

Advanced Functional Materials, EarlyView.
This work demonstrates controlled ground‐state charge‐transfer complex formation (GS‐CTC) and doping in a series of diketopyrrolopyrrole‐based donor–acceptor semiconducting polymers paired with a π‐conjugated penta‐t‐butylpentacyanopentabenzo[25]annulene “cyanostar” macrocycle. Complementary experimental techniques show how subtle molecular, electronic,
Tanner L. Smith, Akshay N. Shah, Tanya A. Balandin, Michel De Keersmaecker, Paramasivam Mahalingam, Debapriya Gupta, Siqi Yu, Eui Hyun Suh, Pushkar Dalal, Erin L. Ratcliff, Scott P. O. Danielsen, Tse Nga Ng, Amar H. Flood, Jason D. Azoulay   +13 more
wiley   +1 more source