Recognition of Convolutional Codes

Radio communication remains one of the most effective and prevalent methods of communication to date. Therefore, there is a need for tools (such as the Universal Digital Demodulator), which would give the appropriate state services the ability to monitor unknown radio emissions. Un-fortunately, manufacturers of hardware and software for automatic recognition of radio com-munication protocols do not publish the solutions they use, arguing that these solutions are proprietary information. The authors of the article did not find many articles on automatic recognition of convolutional codes in the available literature, and thus propose such a convolu-tional code recognition method, which is one of many components of the radio communication protocol recognition system. The first part of the article contains a short description of the convolutional code decoding process using the Viterbi algorithm. What follows is a presentation of an innovative method of automatic recognition of convolutional code types, based on monitoring of path metrics values during the operation of the Viterbi decoder. Finally, the results of operational efficiency measurements for the proposed algorithm convolutional code recognition algorithm, achieved using computer simulation, are presented.