NOISE-RESISTANT TRANSMISSION OF DIGITAL INFORMATION BASED ON CONVOLUTIONAL CODES

Background. Information transfer is the main physical process that determines the characteristics of information systems for various purposes. In this process, information security methods and tools protect data from the effects of all kinds of interference and noise, leakage, file corruption or other types of attacks. Therefore, the development of this area is relevant for information systems for various purposes. One of the effective ways to deal with errors that occur when transmitting messages over noise channels is the use of noise-resistant coding, which ensures the safe transmission of large amounts of digital information with a minimum number of errors. The operation of a noninvasive electrocardiagnostic system with multiple registration of electrocardiosignals in screening conditions is characterized by a complex signal-interference environment and leads to the development of technical and organizational methods to combat interference. The purpose of the article is to substantiate the use of convolutional codes in a multichannel information and measurement system to ensure the safe and reliable transmission of large amounts of digital information with a minimum number of errors. Materials and methods. Based on a critical analytical review, a method of secure information transmission based on convolutional codes has been selected for use in a noninvasive electrocardiagnostic system with multiple registration of electrocardiosignals and in a free-form inertial navigation system. Results. A simulation of the encoding of convolutional codes with a short code restriction length and with decoding using the Viterbi algorithm is presented. The difference in the signal-to-noise ratio when using coding and without it, with its positive value, determines the energy gain of the code, expressed in decibels. Conclusions. The results obtained show the advantages of using convolutional codes when transmitting information in a non-invasive electrocardiagnostic system with multiple registration of electrocardiosignals and in a free-form inertial navigation system.