Analysis of total signal decay and capacity of information data in wireless atmospheric communication links. Part 2

Abstract

Introduction: Analysis of total signal decay is based on prognosis of the total path loss occurring in the atmospheric communication links, accounting for effects of gaseous structures attenuation and scattering, hydrometeors (rain, snow and clouds) absorption and attenuation, and turbulent structures fast fading on radio and optical signals passing atmospheric channels with fading. Purpose: To perform a novel methodology of definition and estimation of effects of decay, absorption, scattering, and fading of radio and optical signals propagating in atmospheric channels in various meteorological conditions. Results: Wasanalyzed the impact of gaseous structures, hydrometeors and turbulent structures in total path loss for link budget design and in degradation of data stream parameters, such as capacity, spectral efficiency and bit-error-rate, which lead in loss of information data signals passing such kinds of channels with fast fading and decrease of quality of service. An optimal algorithm was found of the total path loss prediction for various meteorological situations occurring in the real atmosphere at different heights and for various frequencies of radiated signals. A method was proposed of how to evaluate the data stream parameters, capacity, spectralefficiency and bit-error-rate, accounting for the effects of atmospheric turbulence impact on fast fading, which corrupts information passing such kinds of channels. All practical tests were illustrated by the use of the MATLAB utility. A new methodology was proposed on how to evaluate and estimate the capacity, the spectral efficiency, and the loss in energy and in the information data stream for different scenarios of radio and optical signals propagation via atmospheric channels with fading caused by different meteorological conditions. Practical relevance: The results obtained allow to achieve better accuracy of prognosis and increase quality of service in atmospheric communication channels.

NLOS Communication: Theory and Experiments in the Atmosphere and Underwater

“…For atmospheric OECS, it is possible to choose the spectral characteristics of laser sources over a wide range of the spectrum, from UV to IR. In water, this choice is limited to the visible (green or dark blue) range of the spectrum because of the strong absorption by water of non-visible radiation (for example, see [12,26]). There are a number of drawbacks of the bistatic communication configuration that could result in its unfeasibility.…”

“…Over the past 7 years, investigations on problems of NLOS communication in atmospheric and water media have been carried out in the Russian Federation only at the Institute of Atmospheric Optics of the Siberian Branch of the Russian Academy of Science (SB RAS). Some aspects of joint research work, regarding optical waves and laser beams in the irregular atmosphere performed with our co-authors from Israel, were published by IEEE in 1970 [3] and by CRC Press in 2018 [4], and in papers [12]. The present paper summarizes the main results of this research undertaken during the past decade.…”

“…In the present work, results of investigations of optoelectronic communication systems (OECS) in which the useful signal is comprised of scattered or reflected optical radiation are considered. These OECS are called non-line-of-sight (NLOS) systems, and in Russia they are more often called over-the-horizon or bistatic systems (for example, see [2][3][4][5][6][7][8][9][10][11][12]). If communication is based on reflected radiation (from a plane, a building, a ship hull, a submarine surface, etc.…”