Results 251 to 260 of about 4,863,781 (309)
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Measurement science and technology, 2021
We herein introduce a wireless dielectric sensing platform that enables long-range interrogation of compact and fully-passive chipless sensors in complex environments filled with clutters and self-jamming. This telemetry technique requires postprocessing
Liang Zhu, Pai-Yen Chen
semanticscholar +1 more source
We herein introduce a wireless dielectric sensing platform that enables long-range interrogation of compact and fully-passive chipless sensors in complex environments filled with clutters and self-jamming. This telemetry technique requires postprocessing
Liang Zhu, Pai-Yen Chen
semanticscholar +1 more source
Design and Implementation of FHSS (Frequency Hopping Spread Spectrum ) Synthesizer
International Computer Science Conference, 2021This work aims to design and implement a secure frequency hopping spread spectrum system (FHSS) on an FPGA. Design is modelled using the Verilog HDL module. In this work, Xilinx ISE Design suite 14.4 software is used along with the ModelSim simulator and
Nagendra Kumar Vishwakarma, R. Singh
semanticscholar +1 more source
Interception of frequency hopped spread spectrum signals
IEEE International Conference on Communications, Including Supercomm Technical Sessions, 1990A frequency-hopped, spread-spectrum signal is modeled as a sinusoid that has one of N random, discrete frequencies. Based on this model, the Neyman-Pearson detection theory is used to derive optimum coherent and noncoherent receiver structures. It is shown that the probability of detection, P/sub D/, approaches, the probability of false alarm, P/sub F/,
Norman C. Beaulieu +2 more
openaire +2 more sources
Advanced frequency hopping modulation for spread spectrum WLAN
IEEE Journal on Selected Areas in Communications, 2000A wireless LAN standard developed by IEEE committee P802.11 operates in the unlicensed 2.4 GHz ISM band. This band is a very hostile environment due to many unpredictable interference sources, such as microwave ovens, utilizing the same frequency bands.
Savo Glisic +3 more
openaire +1 more source
Frequency Hopping Spread Spectrum to Counter Relay Attacks in PKESs
2021Passive keyless entry and start systems (PKESs) have been widely deployed in modern cars. These systems have brought many advantages over their predecessors and are considered more secure. However, they are subject to a new type of attack, known as relay attack. Due to this attack, hundreds of cars have been stolen in many countries.
Karim Lounis, Mohammad Zulkernine
openaire +1 more source
Capacity of Coherent Frequency-Hop Spread-Spectrum Communications
Proceedings. IEEE International Symposium on Information Theory, 2002The capacity of a coherent frequency-hopped (C-FH) spread-spectrum system is investigated, The channel comprises an M-ary phase-shift keying (M-PSK) modulator, a frequency hopper with phase-continuous carrier, the transmission medium, a nonideal phase-coherent frequency dehopper, an M-PSK demodulator, and a carrier tracking system.
G. Cherubini, W. Stark
openaire +1 more source
International Journal of Communication Systems, 2020
Decoding of frequency‐hopping spread spectrum (FHSS) methods to intercept the symbol content in signals and brilliant measurement is presented in this paper.
Sameh Ghanem
semanticscholar +1 more source
Decoding of frequency‐hopping spread spectrum (FHSS) methods to intercept the symbol content in signals and brilliant measurement is presented in this paper.
Sameh Ghanem
semanticscholar +1 more source
Tracking of Frequency Hopped Spread Spectrum Signals in Adverse Environments
MILCOM 1982 - IEEE Military Communications Conference - Progress in Spread Spectrum Communications, 1982Tracking requirements for a frequency hopped spread spectrum system with a view to application in mobile radio are investigated. Models characterizing Rician fading and multiple access or jamming environments are used to formulate signal detection probabilities. These determine the mean time to loss of lock.
Clive A. Putman +2 more
openaire +2 more sources
Physical Communication, 2020
In this paper, we propose a method of mixing modulation schemes to make it very difficult to intercept information from frequency hopping signals and assess analytically the difficulty of information interception using the interceptor computational ...
J. W. Park, Do-Sik Yoo, Seong-Jun Oh
semanticscholar +1 more source
In this paper, we propose a method of mixing modulation schemes to make it very difficult to intercept information from frequency hopping signals and assess analytically the difficulty of information interception using the interceptor computational ...
J. W. Park, Do-Sik Yoo, Seong-Jun Oh
semanticscholar +1 more source