Results 51 to 60 of about 27,516 (271)
Weak Underwater Signals’ Detection by the Unwrapped Instantaneous Phase
Journal of Marine Science and EngineeringIn marine seismic surveys, weak signals can be overlaid by stronger signals or even random noise. Detecting these signals can be challenging, especially when they are close to each other or partially overlapping.
Aldo Vesnaver +2 more
doaj +1 more source
Applied Sciences, 2018 Chromatic and temperature induced dispersion can both severely affect incoherent high data rate communications in optical fibre. This is certainly also true for incoherent optical code division multiple access (OCDMA) systems with multi-wavelength ...
Md Shakil Ahmed, Ivan Glesk
doaj +1 more source
Performance of chirped-FSK and chirped-PSK in the presence of partial-band interference [PDF]
2011 18th IEEE Symposium on Communications and Vehicular Technology in the Benelux (SCVT), 2011 To improve interference robustness of wireless communication, spread spectrum techniques are often used. We use the chirp spreading technique along with FSK and PSK binary modulation schemes to obtain interference robust radio communication. The performance of chirped-FSK and chirped- PSK modulation through a white gaussian noise channel is simulated ...
Dutta, R. +3 more
openaire +1 more source
Few-cycle fiber pulse compression and evolution of negative resonant radiation [PDF]
, 2014 We present experimental observations of the spectral expansion of fs-pulses compressing in optical fibers. Using the input pulse frequency chirp we are able to scan through the pulse compression spectra and observe in detail the emergence of negative ...
McLenaghan, J. +1 more
core +1 more source
Dipolar Coupling Errors in Nuclear Spin Qubits
Advanced Science, EarlyView.Multi‐nuclear spin registers of phosphorus‐atom qubits in silicon have demonstrated 99.99% single and >$>$99.9% two qubit gate fidelities. Despite nanometer separation, read‐out fidelities between individual nuclear spins within the register are not identical.
I. D. Thorvaldson +15 more
wiley +1 more source
A Low-Ambiguity Signal Waveform for Pseudolite Positioning Systems Based on Chirp
Sensors, 2018 Signal modulation is an essential design factor of a positioning system, which directly impacts the system’s potential performance. Chirp compressions have been widely applied in the fields of communication, radar, and indoor positioning owing to ...
Qing Liu +3 more
doaj +1 more source
The Invincible (1758) site: an integrated geophysical assessment
, 1998 Chirp sub-bottom profiler and repeat sidescan sonar imaging of the Invincible wreck site (1758) in the Solent (U.K.), interpretation, and implications for management of the ...
Quinn, Rory +3 more
core +1 more source
Advanced Science, EarlyView.Niobium nitride (NbN) broadband plasmonic metasurface absorbers provide an efficient platform for solar‐energy conversion through hot‐carrier injection. Quasi‐epitaxial NbN features a low work function of 4.0 eV, reducing the interfacial injection barrier and facilitating charge transfer into adjacent photocatalysts.
Tzu‐Yu Peng +11 more
wiley +1 more source
Generation of optical signals carrying OAM based on vortex fiber-optic periodic structures
Физика волновых процессов и радиотехнические системы, 2020 In this article, author considers the process of generation of fiber modes carrying orbital angular momentum (vortex modes) using chiral fiber Bragg gratings; in this context, the formation of vortex modes is carried out by converting thefundamental mode
Azat R. Gizatulin
doaj +1 more source
IEEE Access, 2021 A novel photonic scheme for generating multi-band dual-chirp waveforms with linear or nonlinear chirp rates is proposed via two cascaded polarization modulators (PolMs) paralleled with a phase modulator (PM).
Hongshi Zhao, Jianxin Ma
doaj +1 more source