TURBO DECODER AND TURBO DECODING METHOD, PROGRAM, AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a turbo decoder the increase in the circuit scale of which is suppressed. SOLUTION: A turbo decoder includes: a first element decoding unit 12 for obtaining a first information likelihood A1on the basis of an information bit sequence S, a first redundant bit sequence P1, and a first prior likelihood L1; a first subtractor 16 for subtracting the first prior likelihood L1from the first information likelihood A1; a first interleaver 18 for interleaving the output of the first subtractor 16; a second interleaver 19 for interleaving the information bit sequence S; a prior likelihood arithmetic section 40 for subtracting the doubled output of the second interleaver 19 from the output of the first interleaver 18 to obtain a second prior likelihood L2; a second element decoding unit 22 for obtaining a second information likelihood A2on the basis of the output of the second interleaver 19, a second redundant bit sequence P2, and the second prior likelihood L2; a first de-interleaver 32 for de-interleaving the second information likelihood A2; and a hard decision unit 34 for applying hard decision to the output of the first de-interleaver 32, and the first prior likelihood L1is obtained on the basis of the second information likelihood A2. COPYRIGHT: (C)2006,JPO&NCIPI