EVALUATION OF THE EFFICIENCY OF SYNCHRONIZING PSEUDORANDOM SEQUENCES ON THE BASIS OF MAJORITARY ALGORITHM AT THE DEVELOPMENT OF DESTRUCTIVE ERRORS
Despite a substantial period of time, the problem of pseudo-random sequences (PRS) synchronization still remains topical. First, this is due to the wide technologies commercialization of distributed spectrum started in the late 70-s of XX century [1] by introduction of mobile telephone systems, and due to continued development aimed at increased efficiency [2]. Secondly, the urgency of the problem can be connected to the implementation of advanced methods of multiple accesses, greatly increasing the performance of media access control (MAC) protocols using PRS. Thus, the use of PRS-oriented MAC protocols in the information processing systems is topical and the most promising tendency of information technology development under informatization conditions in country during the transition to a digital economy. The paper aims at evaluating the effectiveness of PRS synchronization on the basis of majority algorithm with increasing destructive errors and at justification of objectives for further research. The paper deals with the following methods: Ward’s method (for ‘valid interval’), the synchronization method based on a majority of the processing segments of the PRS. It is shown that the majority method is beneficial for noise immunity by correcting errors in the valid interval, in comparison with Ward’s method and can be easily implemented at sub-level access to the transmission medium MAC. Also the paper considers the synchronization method based on a majority of the processing segments of the PRS. It justifies urgency of such techniques at sub-level of MAC protocols. The article also describes goals and topical objectives of further study viz. evaluation of time characteristics of the synchronization method based on the majority of checks; evaluation of probabilistic characteristics method, providing that the information processing system is synchronized by a short segment of PRS; method modification based on obtained results for the purpose of improving its efficiency by increased probability of destructive errors in information processing and control systems using PRS-oriented MAC protocols of multiple access.