Мerzlikin A. METHODS AND MEANS OF INCREASING THE PERFORMANCE AND AVAILABILITY OF MILLIMETRE WAVE COMMUNICATION CHANNELS

Merzlikin A.O. Methods and means of enhancing the productivity and communication channels readiness of the millimeter wavelength. – Qualifying scientific work on manuscript rights. Dissertation for obtaining the degree of Doctor of Philosophy in specialty 172 "Telecommunications and radio engineering" (17 - Electronics and telecommunications). - Kharkiv National University of Radio Electronics, Ministry of Education and Science of Ukraine, Kharkiv, 2023. The dissertation is devoted to the current task of researching the characteristics of the propagation of radio waves of the millimeter wave frequency range (MM DW), calculating the readiness of communication channels, and developing working MM DW lines taking into account the microclimatic parameters characteristic of the Kharkiv region in the city of Kharkiv. The relevance lies in the creation of databases through experimental studies, without which it is impractical to introduce a new generation of communication in Ukraine. Without data on precipitation with a short averaging period, and without experimental studies of atmospheric attenuation in the MM wave frequency range, it is impossible and economically impractical to introduce optimized networks of the next 5G-6G generations in Ukraine. MM DW works at high frequencies from 30 GHz to 300 GHz, such a signal is not capable of working stably over long distances. Many countries are now actively conducting research in this direction. In the USA, China and some other countries, 5G is already being actively introduced; this can be observed by looking at how smartphone manufacturers are actively installing processors capable of working with next-generation networks in their new gadgets. Unfortunately, Ukraine cannot yet start implementing communication channels that will work in MM DW due to the lack of data on the influence of precipitation and the atmosphere on the spread of the 30-300 GHz range. If a database is to be created on the amount of precipitation, it would be possible to calculate the availability coefficient of radio lines; based on this data communication lines with a high reliability coefficient could be built. In the next-generation communication networks, antennas have to be installed from 1000 to several hundred meters apart from each other, which results in high costs for the construction of communication channels. To reduce the expenses, the readiness parameter needs to be calculated and the installation of the antennas should be done at the maximum permissible distance at which they will work correctly all the time. Therefore, a relevant task of reducing costs emerges, to tackle which it is necessary to accurately calculate the readiness of the millimeter wave communication channel.