FIELD: the invention refers to the field of radio liaison particularly to arrangements and modes for definition of logarithmic likelihood ratio for turbo codes and the metrics of embranchment for convolutional codes at using preliminary coding.
SUBSTANCE: the technical result is reduction of the effect of multiplication of errors achieved because multitude of signal elements is received. At that the signal element contains the totality of modulation symbols out of the totality of coded bits, the first subset of signal elements for which the bit has the first meaning and the second subset of signal elements for which the bit has the second meaning are defined. At that the first and the second subsets are signal elements out of an extended signal group. The probability that the bit equals the first meaning or the second meaning depending from the received signal element is defined, then the symbol of flexible decision of possibility that the bit equals the first meaning or the second meaning is defined. At that the symbols of flexible decision may be represented by the logarithmical likelihood ratios.
EFFECT: reduces effect of multiplication of errors.
38 cl, 7 dwg
