COMMUNICATION APPARATUS AND DECODING METHOD

摘要

A communication apparatus according to the present invention is a communication apparatus at a receiving side that decodes an LDPC-encoded codeword, and includes: an intermediate-result retaining unit (21) that retains an intermediate result of a decoding; a row processing unit (22) that repeatedly performs row processing of calculating a column-processing LLR for each column and each row in a check matrix, by a predetermined number of times; and a column processing unit (23) that calculates a row-processing LLR for each column and each row of the check matrix, and further repeatedly performs column processing of holding a minimum value k of absolute values of the row-processing LLR for the row weight in the intermediate-result retaining unit (21). The row processing unit (22) and the column processing unit (23) alternately execute the process in column unit. The column processing unit (23) cyclically updates the minimum k value of each row, and the row processing unit (22) performs calculation using an approximate minimum value.