TURBO DECODING APPARATUS

A turbo decoding apparatus comprises: a backward-probability calculation unit that executes backward-probability calculation from time N to time 0 with respect to coded data having an information length N (N is a natural number) which is encoded with turbo-encoding; a storage unit to store backward-probability calculation results extracted from a plurality of continuous backward-probability calculation results regarding a predetermined section of at intervals of n-time; a forward-probability calculation unit that executes forward-probability calculation from time 0 to time N with respect to the coded data; and a decoded result calculation unit that calculates a decoded result of the coded data through joint-probability calculation using forward-probability calculation results by the forward-probability calculation unit and the backward-probability calculation results stored in the storage unit and backward-probability calculation results obtained through recalculation by the backward-probability calculation unit.