Abstract: The present invention relates to a data processing apparatus and a data processing method which can improve the tolerance to errors of data. A demultiplexer replaces, in accordance with an allocation rule for allocating code bits of an LDPC code to symbol bits representative of symbols, mb bits from among the code bits and sets the code bits after the replacement as symbol bits of b symbols. According to the allocation rule, where groups into which the code bits and the symbol bits are to be grouped in response to an error probability thereof are set as code bit groups and symbol bit groups, respectively, a combination of any of the code bit groups and the symbol bit group of the symbol bits to which the code bits of the code bit group are to be allocated and bit numbers of the code bits and the symbols bits are prescribed.

Abstract: When carrying out puncturing of some redundant bits in an LDPC code having a check matrix of QC structure and LDGM structure, a puncture rule for preventing redundant bits which are chained to one another from being punctured is set up, and some redundant bits out of an LDPC-coded signal are punctured out of the LDPC-coded signal according to the puncture rule. As a result, redundant bits which are chained to one another can be left.

Abstract: A communication device that transmits and receives LDPC-encoded information by using MIMO technology. The communication device includes a transmission sorting unit that sorts LDPC-encoded bits constituting the LDPC-encoded information in a descending order of column degree of a check matrix used for generating the LDPC-encoded bits; and a signal transmitting unit that transmits the LDPC-encoded bits sorted by the transmission sorting unit by allocating the LDPC-encoded bits from a transmission line having a lower noise level in sorted order.