Soft decision value generation apparatus and soft decision value generation method

摘要

A hard decision value calculation unit 41 that calculates a hard decision value from the I-ch and Q-ch coordinates of the received symbol subjected to multilevel modulation, and an LLR from the I-ch and Q-ch coordinates of the received symbol. An LLR calculation unit 42 that calculates approximately is provided, and the LLR correction unit 43 contradicts the hard decision value calculated by the hard decision value calculation unit 41 with the sign bit of the LLR calculated by the LLR calculation unit 42. In this case, the sign bit of the LLR is inverted, and the LLR after the sign bit inversion is output to the error correction decoding unit 32 as a soft decision value.