SUBSTANTIATION OF OPTIMUM WAYS OF CREATION OF PROMISING TROPOSPHERIC STATIONS
Vladimir G. Anisimov, JSC “Moscow scientific-research radio engineering Institute”,
Moscow, Russia, anisimovvg54@mail.ru
Lyudmila O. Myrova, JSC “Moscow scientific-research radio engineering Institute”,
Moscow, Russia, lmyrova@rambler.ru
Abstract
The need for means of tropospheric communication for the deployment of telecommunication networks of the modern generation requires the study and justification of the main technical characteristics of promising means of tropospheric communication, which is the subject of the article. The purpose of the article is to determine the optimal principles of construction of modem equipment and microwave paths for the implementation of high efficiency and hardware reliability of promising means of tropospheric communication. In accordance with the research methodology, the article analyzes the energy efficiency of frequency ranges used for tropospheric communication in the Russian Federation, and makes recommendations on the use of frequency ranges in communication networks for various purposes. The energy efficiency of promising means significantly increases when adapting to the propagation conditions on the tropospheric interval with the choice of the optimal transmission frequency from the assigned frequency group N. the Transmission at the optimal frequency allows to obtain an energy gain of 3…5 dB compared to the classical multi-frequency signal method. The article presents the results of calculating the optimal capacity for mobile tropospheric lines, taking into account the peculiarities of the climate of the Russian Federation. Structural construction of means of tropospheric communication is largely determined by the type of modem. In principle, there are two approaches to the construction of a modem in the conditions of intersymbol interference. In the first case, the compensation of intersymbol interference with the separation of intersymbol copies of signals, their inphase addition with the implementation of the gain from the “hidden” spread to 3-4 dB. In the second approach, the General information flow is divided into sub-streams with velocities at which inter-symbol interference has no effect (the duration of the symbol is longer than the multipath time) and involves the use of signals of the form of the OFDM. The article presents a comparative analysis of the effectiveness of options for constructing a tropospheric modem with compensation for intersymbol interference and OFDM type.
Keywords: frequency adaptation, time duplex, over-the-horizon communication, intersymbol interference, multipath, optimal frequency, noise immunity, frequency duplex, energy gain, tropospheric communication, multipath propagation, spaced reception, OFDM.
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Information about authors:
Vladimir G. Anisimov, JSC “Moscow scientific-research radio engineering Institute”, chief designer-head of projects on tropospheric communication systems, Moscow, Russia
Lyudmila O. Myrova, JSC “Moscow scientific-research radio engineering Institute”, head of research Department, doctor of technical Sciences, professor, Moscow, Russia