And an error correction decoding apparatus calculator Llr

2 sets reference-point unit (101) becomes a calculation target bit LLR symbol is transmitted and a point 0 transmission symbol point 1 is determined by selecting two reference point pairs 2. LLR computation unit (113) for each calculated for the reference point pairs 2 2 LLR weighted adder, adding the value obtained by adding the correction term depending on the case of 0, the value of the computation is thus obtained for the two reference point pairs LLR.