Patent ID: 6615386
Filing Date: 2003-09-02
Classification: H03M,H04L

Abstract:
An error correcting apparatus for receiving a signal subjected to a repetition processing in which a part of bits of an error-correction code train are repeatedly transmitted, and decoding said received signal so as to be restored to the original data train, said error-correction apparatus comprising:a receiver/demodulator unit for receiving and demodulating a signal subjected to the repetition processing in which a part of bits of the error-correction code train are repeatedly transmitted, and outputting a soft decision data train; a soft decision data train generator for adding a soft decision data which corresponds to the repeatedly transmitted bits, so as to generate a soft decision data train which corresponds to the original error-correction code train; and a soft decision error-correction decoder for restoring said soft decision data train to said original data train; wherein said soft decision data train generator includes: a repetition regenerator for obtaining the positions of said bits which are repeatedly transmitted due to said repetition processing, and adding a soft decision data which corresponds to said positions so as to generate said soft decision data train which corresponds to said original error-correction code train; a repetition rate calculator for calculating the repetition rate of said received signal subjected to said repetition processing; a first soft decision data cut-off position decision unit for deciding a position at which a part of said soft decision data which is to be input into said soft decision error-correction decoder is cut off from said soft decision data which is generated by said repetition regenerator, on the basis of said repetition rate; and a first soft decision data cutting means for cutting off said part of said soft decision data at the decided cut-off position and inputting the cut part into said soft decision error-correction decoder.