SOFT DECISION APPARATUS AND METHOD Russian patent published in 2012 - IPC H03M13/45 

FIELD: information technology.

SUBSTANCE: soft decision apparatus and method are used to output a soft decision value for each bit of each symbol, used when decoding each symbol, as a value which corresponds to a function value obtained by applying a predetermined function for each bit to the sampling value of each symbol in accordance with the demodulated signal such that probability distribution of the sampling value in each symbol point is a Gaussian distribution. The function for each bit approaches a curve which expresses probability that each bit is equal to 1 or 0 for the sampling value of each symbol of the demodulated signal, and is also defined using a quadratic function.

EFFECT: high accuracy of decoding.

5 cl, 17 dwg