Horlynskyi B. Methods for ensuring the reliability of information in the wireless data transmission device adaptive coding

The dissertation is devoted to the research of topical problems of wireless data transmission device (WDTD), their further development, and increase of effi-ciency of WDTD in the conditions of interference of interferences by ensuring the reliability of information through the development of methods based on adaptive coding and their use. For the first time, a method of ensuring the reliability of information in the WDTD is proposed based on the adaptation of different code structures, which allows to provide the specified indicators of information reliability and reduce the number of elementary operations of digital signal processors in digital processing of coded data. The difference between the developed method and the existing one, which determines its novelty, is the application of different noise-resistant codes in the structure, from simpler to more complex ones, depending on the signal-to-noise ratio in the channel, which leads to providing the specified characteristics of the reliability of information. It is established that the introduction of adaptive selection of Reed-Solomon`s codes, BCH codes and multicomponent turbo codes for a given bit error probability allowed to reduce the number of elementary operations of digital signal processors in digital processing of encoded data by 39-46% in case of influence of non-stationary intent on the intentional signal interference from 6 to 1 dB. For the first time was proposed, a computational method of fuzzy decoding of many component turbo codes in the WDTD, which, in contrast to the available ones, uses membership functions to calculate transient recursions and log-likelihood ratios of the turbo code decoding algorithms. It has been investigated that the use of the method due to the introduction of membership functions allows to obtain an energy gain of 0.2–0.8 dB compared to the known methods. For the first time was proposed, a method of preparing primary information for adaptive WDTD, which, unlike the available ones, increases the dimensionality of code and interference space, and also uses new analytical ratios to calculate the average bit error probability for different intentional interference strategies and the use of three components turbo code. It is investigated that the use of the method due to the introduction of new analytical dependencies obtained, taking into account the parameters of the interference, allows to secure the specified indicators of reliability of information in the WDTD, with the energy-genetic gain of coding due to the use of three component turbo-code is 0.8 dB in comparison with known methods.