Results 31 to 40 of about 1,502 (175)
Fetal Heart Sounds Detection Using Wavelet Transform and Fractal Dimension
Frontiers in Bioengineering and Biotechnology, 2017 Phonocardiography is a non-invasive technique for the detection of fetal heart sounds (fHSs). In this study, analysis of fetal phonocardiograph (fPCG) signals, in order to achieve fetal heartbeat segmentation, is proposed.
Elisavet Koutsiana +5 more
doaj +1 more source
Fast carrier recovery in FHSS systems with DDS based Costas loop [PDF]
Electronics, 2015 Owing to fast change of carrier frequency, the usage of coherent demodulation methods in Frequency-Hopping Spread Spectrum (FHSS) communication systems is limited by the coherent state acquisition performed by the local oscillator.
Slavko Šajić
doaj +1 more source
Radio Frequency Fingerprinting for Frequency Hopping Emitter Identification
Applied Sciences, 2021 In a frequency hopping spread spectrum (FHSS) network, the hopping pattern plays an important role in user authentication at the physical layer. However, recently, it has been possible to trace the hopping pattern through a blind estimation method for ...
Jusung Kang +4 more
doaj +1 more source
FHSS transceiver over wireless indoor optical channels [PDF]
2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754), 2005 1573
Francisco Alberto Delgado Rajó +3 more
openaire +3 more sources
IEEE Access, 2019 Difference systems of sets (DSS) and frequency-hopping sequences (FHS) are two objects with many applications in wireless communication. Zero-difference balanced function (ZDBF) and near zero-difference balanced functions (NZDBF) are two types of ...
Zongxiang Yi, Chunming Tang
doaj +1 more source
Journal of Contingencies and Crisis Management, Volume 34, Issue 3, September 2026.ABSTRACT Organisational crises are intensifying, yet the psychological mechanisms determining how individuals and teams perform under acute disruption remain insufficiently understood. Conservation of resources (COR) theory offers a widely cited framework, but its resource caravan concept leaves functional relationships among resources unspecified ...
Paul Wood
wiley +1 more source
Tongxin xuebao, 2021 In order to improve the anti-jamming ability and security of the wireless communication system， an index frequency-hopping anti-interference encryption method based on rotation scrambling was designed， which could be simply called encrypted index ...
Xinjin LU, Jing LEI, Yuxin SHI
doaj +2 more sources
A Probability‐Aware AI Framework for Reliable Anti‐Jamming Communication
CAAI Transactions on Intelligence Technology, Volume 11, Issue 2, Page 349-366, April 2026.ABSTRACT Adversarial jamming attacks have increased on communication systems, causing distortion and threatening transmissions. Typical attacks rely on traditional, well‐defined cryptographic protocols and frequency‐hopping techniques. Nevertheless, these techniques become vulnerable when facing intelligent jammers.
Tawfeeq Shawly, Ahmed A. Alsheikhy
wiley +1 more source
Soft Decoding Assisted Interference Cancellation in a Non-Binary LDPC Coded Fast Frequency Hopping Multiuser System Using Product Combining [PDF]
, 2007 In this contribution, soft-input-soft-output (SISO) decoding aided successive interference cancellation (SIC) is considered in fast frequency hopping (FFH), M-ary frequency shift keying (MFSK) using product combining (PC), when operating in multiple ...
Lie-Liang Yang +7 more
core +2 more sources
Design of Code Acquisition Method of FHSS System [PDF]
The Scientific Bulletin of Electrical Engineering Faculty, 2019 Abstract Frequency hopping spread spectrum (FHSS) communication systems offer significant performance advantages in view of their low probability of intercept, improved performance in multipath fading environments and their ability to avoid interference by hopping into low interference frequency channels.
Mohanad Abdulhamid, Gabriel Ogwali
openaire +1 more source