ОГЛЯД АДАПТИВНИХ МЕТОДІВ ЗАБЕЗПЕЧЕННЯ ДОСТОВІРНОСТІ ПЕРЕДАЧІ ІНФОРМАЦІЇ ПРИ ВИКОРИСТАННІ ЗАВАДОСТІЙКОГО КОДУВАННЯ У СИСТЕМАХ БЕЗДРОТОВОГО ЗВ'ЯЗКУ

Analysis of the current state and development of wireless communication systems, such as first generation 1G, second generation 2G, third generation 3G, fourth generation 4G LTEAdvanced, fifth generation 5G, Wi-Max and Wi-Fi, shows the need application of information technologies that allow efficient data transmission in real time. In such systems, ensuring a given level of reliability of information transmission is carried out through the use of information technology adaptation and coding. With increasing noise levels, existing methods of ensuring the reliability of information based on correction codes do not provide the specified indicators of the efficiency of information transmission. With restrictions on code parameters, in systems with adaptation, in the case of increasing noise levels to a certain value, ensuring the specified characteristics of the reliability of information becomes impossible. Therefore, the question arises of the use of turbo codes and their multilevel parametric adaptation. In the case of reverse data decoding, there is a need for a priori information on the plausibility functions of the received data, taking into account the procedure of decoding algorithms based on probabilistic decoding, namely for turbo codes. It is possible to form estimates of uncertainty of information during decoding, to minimize these estimates by choosing the rules of decision using the methods of parametric adaptation and to ensure the reliability of information transfer. [ABSTRACT FROM AUTHOR]