METHOD FOR DIAGNOSING CONVOLUTIONAL CODES Russian patent published in 2017 - IPC H03M1/00 H03M13/23 

FIELD: radio engineering, communication.

SUBSTANCE: knowing the structure of the used encoder and the convolutional code is required when performing the decoding of the convolutional codes, since it is impossible to perform the error correction in the absence of this information. In this method, the components of the total received code sequence with different generating polynomials, are re-encoded by handling their structure, the re-encoded results are compared. Since the symbols of the initial code sequence are mutually independent, the comparison results for all combination kinds of the polynomials will also be random, except the desired kind of the polynomials. They will always coincide for it. After accumulating a sufficient number of thecomparison results, the prevailing cumulative sum will indicate the diagnosed structure of the generating polynomials and the diagnosed code structure.

EFFECT: defining the structure of the used encoder to provide efficiency of the decoders, and increasing the interference immunity of the information transmission.

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