Performance of BPSK subcarrier intensity modulation free-space optical communications using a log-normal atmospheric turbulence model [PDF]
, 2010 In this paper, we present simulation results for the bit error rate (BER) performance and the fading penalty of a BPSK - subcarrier intensity modulation (BPSK-SIM) free-space optical (FSO) communication link in a log-normal atmospheric turbulence model ...
Ghassemlooy, Zabih +6 more
core +2 more sources
High-resolution large-eddy simulations of stably stratified flows: application to subkilometer-scale turbulence in the upper troposphere–lower stratosphere [PDF]
Atmospheric Chemistry and Physics, 2014 Large-eddy simulations of stably stratified flows are carried out and analyzed using the mesoscale atmospheric model Méso-NH for applications to kilometer- and subkilometer-scale turbulence in the in the upper troposphere–lower stratosphere.
R. Paoli +4 more
doaj +1 more source
Simplified Performance Analysis of OWC System Over Atmospheric Turbulence with Pointing Error [PDF]
arXiv, 2020 Optical wireless communication (OWC) is highly vulnerable to the atmospheric turbulence and pointing error. Performance analysis of the OWC system under the combined channel effects of pointing errors and atmospheric turbulence is desirable for its efficient deployment.
arxiv
Femtosecond Laser Filamentation in Atmospheric Turbulence [PDF]
arXiv, 2023 The effects of turbulence intensity and turbulence region on the distribution of femtosecond laser filaments are experimentally elaborated. Through the ultrasonic signals emitted by the filaments, and it is observed that increasing turbulence intensity and expanding turbulence active region cause an increase in the start position of the filament, and a
arxiv
Recent Developments in Understanding Two-dimensional Turbulence and the Nastrom-Gage Spectrum [PDF]
J. Low Temp. Phys. 145, 25-57, 2006 Two-dimensional turbulence appears to be a more formidable problem than three-dimensional turbulence despite the numerical advantage of working with one less dimension. In the present paper we review recent numerical investigations of the phenomenology of two-dimensional turbulence as well as recent theoretical breakthroughs by various leading ...
arxiv +1 more source
The development of volcanic ash cloud layers over hours to days due to turbulence layering [PDF]
arXiv, 2020 Volcanic ash clouds often become multilayered and thin with distance from the vent. We explore one mechanism for development of this layered structure. We review data on the characteristics of turbulence layering in the free atmosphere, as well as examples of observations of layered clouds both near-vent and distally.
arxiv
Turbulence and Fossil Turbulence in Oceans and Lakes [PDF]
, 2003 Turbulence is defined as an eddy-like state of fluid motion where the inertial-vortex forces of the eddies are larger than any of the other forces that tend to damp the eddies out. Energy cascades of irrotational flows from large scales to small are non-turbulent, even if they supply energy to turbulence. Turbulent flows are rotational and cascade from
arxiv +1 more source
Non-Markovian evolution of photonic quantum states in atmospheric turbulence [PDF]
J. Opt. 18, 055203 (2016), 2015 The evolution of the spatial degrees of freedom of a photon propagating through atmospheric turbulence is treated as a non-Markovian process. Here, we derive and solve the evolution equation for this process. The turbulent medium is modeled by a sequence of multiple phase screens for general turbulence conditions. The non-Markovian perspective leads to
arxiv +1 more source
BPSK subcarrier intensity modulated free-space optical communications in atmospheric turbulence [PDF]
, 2009 Free-space optical communications (FSO) propagated over a clear atmosphere suffers from irradiance fluctuation caused by small but random atmospheric temperature fluctuations.
Ghassemlooy, Zabih +1 more
core +1 more source
Spectrum of Atmospheric Turbulence [PDF]
Nature, 1951 DR. E. C. S. MEGAW1 opens his valuable contribution to this subject with a challenging remark. He says, “knowledge of the average properties of turbulence in the free atmosphere is almost totally lacking”. Actually, so many meteorologists have published observations that it would be impossible here to give an adequate list of them. As long ago as 1926,
openaire +4 more sources