RECEPTION APPARATUS AND METHOD, TRANSMISSION APPARATUS AND METHOD, COMMUNICATION SYSTEM, RECORD MEDIUM, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To achieve soft judgment Viterbi decoding even if a multiple-value modulation system is used. SOLUTION: The same processing as a bit interleave that is performed at a transmission side is executed to a candidate replica in all the states of the shift register in a convolutional coder at a transmission side and the candidate Sn ' of a symbol value that is subjected to symbol mapping is stored in a memory 124 in the soft decision Viterbi decoder of the reception apparatus. A multiplication section 125 multiplies the candidate Sn ' of the symbol value that is stored in a memory 124 by a transmission line estimation value fk , and outputs a multiplication result Snk ' to a calculation section 126. The calculation section 126 calculates the square error bnk (namely, square of euclidian distance) between an input symbol xk and the multiplication result Snk '. An extraction section 127 extracts a candidate series for minimizing the square error that is calculated by the calculation section 126 for outputting as a decoded result.