LDPC CODE CREATING METHOD, COMMUNICATION DEVICE, AND CODE SEQUENCE CREATING METHOD

摘要

An LDPC code creating method applicable to multivalue modulation. For example, after the distribution of received signals is categorized for each bit position of a modulation symbol, an order ensemble (an ensemble of the weights of the lines and columns) of a parity check matrix which minimizes the SNR threshold (the SNR value at which the bit error rate sharply decreases when the code length is adequately great) is sought, and a parity check matrix and a creation matrix are created on the basis of the order ensemble acquired as the seek result.