Journal ArticleDOI
Spatial correlation and irradiance statistics in a multiple-beam terrestrial free-space optical communication link
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TLDR
An approximation to the probability density function of the received power of a spatially correlated multiple-beam system in terms of the parameters of the single-channel gamma-gamma function is proposed.Abstract:
By means of numerical simulations we analyze the statistical properties of the power fluctuations induced by the incoherent superposition of multiple transmitted laser beams in a terrestrial free-space optical communication link. The measured signals arising from different transmitted optical beams are found to be statistically correlated. This channel correlation increases with receiver aperture and propagation distance. We find a simple scaling rule for the spatial correlation coefficient in terms of the propagation distance and we are able to predict the scintillation reduction in previously reported experiments with good accuracy. We propose an approximation to the probability density function of the received power of a spatially correlated multiple-beam system in terms of the parameters of the single-channel gamma-gamma function. A bit-error-rate evaluation is also presented to demonstrate the improvement of a multibeam system over its single-beam counterpart.read more
Citations
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Journal ArticleDOI
Survey on Free Space Optical Communication: A Communication Theory Perspective
TL;DR: An up-to-date survey on FSO communication systems is presented, describing FSO channel models and transmitter/receiver structures and details on information theoretical limits of FSO channels and algorithmic-level system design research activities to approach these limits are provided.
Journal ArticleDOI
Turbulence-induced channel crosstalk in an orbital angular momentum-multiplexed free-space optical link
TL;DR: A multichannel free-space optical (FSO) communication system based on orbital angular momentum (OAM)-carrying beams is studied and it is found that turbulence induces attenuation and crosstalk among channels.
Journal ArticleDOI
Fading Reduction by Aperture Averaging and Spatial Diversity in Optical Wireless Systems
TL;DR: This paper quantifies the performance improvement in terms of average bit error rate (BER) and outage capacity, which are among important parameters in practice, and compares single- and multiple-aperture systems from the point of view of fading reduction.
Journal ArticleDOI
All-Optical Multihop Free-Space Optical Communication Systems
TL;DR: In this article, an all-optical amplify-and-forward (OAF) relaying technique was proposed to improve the error performance and overall distance coverage of free-space optical (FSO) communication systems.
Journal ArticleDOI
Diversity Gain and Outage Probability for MIMO Free-Space Optical Links with Misalignment
A.A. Farid,Steve Hranilovic +1 more
TL;DR: The diversity gain of MIMO FSO systems in the presence of atmospheric fading and no misalignment is shown to be proportional to the number of transmitters and receivers, in particular the product MN.
References
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Journal ArticleDOI
Free-space optical communication through atmospheric turbulence channels
Xiaoming Zhu,Joseph M. Kahn +1 more
TL;DR: The use of ML detection in spatial diversity reception to reduce the diversity gain penalty caused by correlation between the fading at different receivers is described.
Journal ArticleDOI
Mathematical model for the irradiance probability density function of a laser beam propagating through turbulent media
TL;DR: In this article, the authors developed a model for the probability density function (pdf) of the irradiance fluctuations of an optical wave propagating through a turbulent medium, which is a two-parameter distribution that is based on a doubly stochastic theory of scintillation.
Journal ArticleDOI
Channels with block interference
TL;DR: It is shown, among other things, that when all other parameters are held fixed, channel capacity C is an {\em increasing} function of the memory length, while the cutoff rate R_{0} generally is a {\em decreasing} function.
Journal ArticleDOI
Theory of optical scintillation
TL;DR: In this article, a heuristic model of irradiance fluctuations for a propagating optical wave in a weakly inhomogeneous medium is developed under the assumption that small-scale irradiance fluctuation fluctuations are modulated by large-scale fluctuations of the wave.
Journal ArticleDOI
Alamouti-type space-time coding for free-space optical communication with direct detection
Marvin K. Simon,V. A. Vilnrotter +1 more
TL;DR: A modification of the Alamouti code originally proposed for RF wireless applications is described that allows it to be applied in scenarios such as free-space optical communication with direct detection where unipolar modulations like pulse-position modulation and on-off keying are traditionally used to convey the information.
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