The soft decision Viterbi decoding device and manner, being the decoding device and

摘要

PROBLEM TO BE SOLVED: To surely reduce the power consumption, while maintaining an error correction capability when decoding convolutional codes.;SOLUTION: In a Viterbi decoder 100 which decodes a reception signal, which is a convolutional code and has a plurality of sequences, by a soft decision Viterbi decoding method, an evaluation control part 30 evaluates the quality of the reception signal and outputs a control signal M, corresponding to the quality to a data acquisition part 20 for branch metric calculation. The data acquisition part 20 for branch metric calculation takes an AND operation between digital multi-value data S1, representing the amplitude of the reception signal and the control signal M to leave the digital multi-value data S1 as is, when the quality of the reception signal lower than a prescribed level and to thin the digital multi-value data S1 per sequence, when the quality of the reception signal equal to or higher than the prescribed level, and outputs a branch metric as data S2 for calculation, to a decoding execution part 90.;COPYRIGHT: (C)2008,JPO&INPIT