ANGULAR SPACED RECEPTION ON TROPOSCATTER AND IONOSPHERIC COMMUNICATION LINES
DOI:
https://doi.org/10.26906/SUNZ.2023.4.167Keywords:
angular diversity reception, spatially diversity reception, troposcatter communication, ionospheric communication, correlation coefficient, energy gainAbstract
In the article paper estimates the effectiveness of the angular diversity of signals on troposcatter and ionospheric communication lines by determining the optimal angle of diversity and energy gain from angular diversity. The dependence of the power at the input receiver of the azimuthal angle at the a angular diversity is presented. The correlation coefficient of the signal envelope at the angular spread in azimuth was obtained, which shows that the correlation is determined not only by the angular spread, but also by the ratio of the width of the antenna directional diagram to the width of the angular energy spectrum of waves scattered by the troposphere. The energy gain at the angular diversity when the directional pattern is oriented along the direction of the radio waves on the track is found. An approximate formula for the error probability of a quadruple reception is given. The formula for energy gain when switching from double spatially dispersed reception to quadruple reception with angular diversity is presented. The maximum energy gain at the optimal angle in compare with the double spatially dispersed reception is found. It was established that the double reception with angular separation has an energy loss in comparison with the double spatially separated reception. The optimal diversity angles for different antenna patterns diagrams is estimates. It is proved that the degree of improvement of the system due to the spread reception is almost the same as when receiving completely uncorrelated signals. Taking into account the change in the correlation coefficient over time, it was established that the efficiency of angular diversity reception will be the same as that of completely uncorrelated signals. It is recommended that angular spread reception for mobile digital troposcatter stations is better implemented horizontally than vertically.Downloads
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