Data processing apparatus and method

Abstract

A data processing apparatus includes a group-wise interleaving unit that performs group-wise interleaving; and a block interleaving unit that performs block interleaving in such a manner that an LDPC code obtained by performing the group-wise interleaving is written in m number of columns as storage regions arranged in the row direction. A type of the block interleaving includes a type A and a type B. A MODCOD which is a combination of the LDPC code and the modulation scheme includes a MODCOD-A which is a MODCOD based on the assumption that the block interleaving of the type A is performed, and a MDOCOD-B which is a MDOCOD based on the assumption that the block interleaving of the type B is performed.

What is claimed is: 
     
         1 . A transmitting apparatus comprising:
 circuitry configured to   perform group-wise interleaving which interleaves an LDPC code word to obtain a group-wise interleaved LDPC code word;   perform block interleaving which interleaves the group-wise interleaved LDPC code word to obtain a block interleaved and group-wise interleaved LDPC code word in such a manner that the group-wise interleaved LDPC code word obtained by performing the group-wise interleaving is written in m number of columns as storage regions arranged in a row direction, m bits are obtained by respectively reading the LDPC code word from m number of columns bit by bit,   perform mapping the block interleaved and group-wise interleaved LDPC code word to any one of 2m number of signal points defined by a modulation scheme; and   perform transmitting a digital broadcast signal including the mapped block interleaved and group-wise interleaved LDPC code word obtained by performing the group-wise interleaving, performing the block interleaving, and performing the mapping,   wherein a type of the block interleaving includes a type A in which writing of the group-wise interleaved LDPC code word obtained by performing the group-wise interleaving in a column direction of the columns is iteratively performed on m number of columns, and a type B in which the writing of the group-wise interleaved LDPC code word obtained by performing the group-wise interleaving in the row direction of m number of columns for every bit group is iteratively performed,   wherein a MODCOD which is a combination of the LDPC code word and the modulation scheme includes a MODCOD-A which is a MODCOD based on the block interleaving of the type A, and a MODCOD-B which is a MODCOD based on the block interleaving of the type B,   wherein when the block interleaving of the type A is performed on an LDPC code word of the MODCOD-B, the circuitry performs the group-wise interleaving on the LDPC code word of the MODCOD-B such that a same block interleaving result as a block interleaving result obtained when the block interleaving of the type B is performed is obtained, and   when the block interleaving of the type B is performed on an LDPC code word of the MODCOD-A, the circuitry performs the group-wise interleaving on the LDPC code word of the MODCOD-A such that a same block interleaving result as a block interleaving result obtained when the block interleaving of the type A is performed is obtained.   
     
     
         2 . A transmitting method comprising:
 group-wise interleaving which interleaves an LDPC code word to obtain a group-wise interleaved LDPC code word;   block interleaving which interleaves the group-wise interleaved LDPC code word to obtain a block interleaved and group-wise interleaved LDPC code word in such a manner that the group-wise interleaved LDPC code word obtained by performing the group-wise interleaving is written in m number of columns as storage regions arranged in a row direction, m bits are obtained by respectively reading the LDPC code word from m number of columns bit by bit,   mapping the block interleaved and group-wise interleaved LDPC code word to any one of 2m number of signal points defined by a modulation scheme; and   transmitting a digital broadcast signal including the mapped block interleaved and group-wise interleaved LDPC code word obtained by performing the group-wise interleaving, performing the block interleaving, and performing the mapping,   wherein a type of the block interleaving includes a type A in which writing of the group-wise interleaved LDPC code word obtained by performing the group-wise interleaving in a column direction of the columns is iteratively performed on m number of columns, and a type B in which the writing of the group-wise interleaved LDPC code word obtained by performing the group-wise interleaving in the row direction of m number of columns for every bit group is iteratively performed,   wherein a MODCOD which is a combination of the LDPC code word and the modulation scheme includes a MODCOD-A which is a MODCOD based on the block interleaving of the type A, and a MODCOD-B which is a MODCOD based on the block interleaving of the type B,   wherein when the block interleaving of the type A is performed on an LDPC code word of the MODCOD-B, the group-wise interleaving is performed on the LDPC code word of the MODCOD-B such that a same block interleaving result as a block interleaving result obtained when the block interleaving of the type B is performed is obtained, and   when the block interleaving of the type B is performed on the LDPC code word of the MODCOD-A, the group-wise interleaving is performed on the LDPC code word of the MODCOD-A such that a same block interleaving result as a block interleaving result obtained when the block interleaving of the type A is performed is obtained.   
     
     
         3 . A receiving apparatus comprising:
 circuitry configured to   perform block deinterleaving which generates, from m bits of a symbol obtained from a digital broadcast signal transmitted from a transmission apparatus, a group-wise interleaved LDPC code word obtained by performing group-wise interleaving; and   perform group-wise deinterleaving which generates, from the group-wise interleaved LDPC code word obtained by performing the group-wise interleaving, an original LDPC code word,   wherein the digital broadcast signal transmitted from the transmission apparatus is processed in the transmission apparatus by circuitry configured to
 perform group-wise interleaving which interleaves the original LDPC code word to obtain a group-wise interleaved LDPC code word, 
 perform block interleaving which interleaves the group-wise interleaved LDPC code word to obtain a block interleaved and group-wise interleaved LDPC code word in such a manner that the group-wise interleaved LDPC code word obtained by performing the group-wise interleaving is written in m number of columns as storage regions arranged in a row direction, m bits are obtained by respectively reading the LDPC code word from m number of columns bit by bit, 
 perform mapping the block interleaved and group-wise interleaved LDPC code word to any one of 2m number of signal points defined by a modulation scheme, and 
 perform transmitting the digital broadcast signal including the mapped block interleaved and group-wise interleaved LDPC code word obtained by performing the group-wise interleaving, performing the block interleaving, and performing the mapping, 
 wherein a type of the block interleaving includes a type A in which writing of the group-wise interleaved LDPC code word obtained by performing the group-wise interleaving in a column direction of the columns is iteratively performed on m number of columns, and a type B in which the writing of the group-wise interleaved LDPC code word obtained by performing the group-wise interleaving in the row direction of m number of columns for every bit group is iteratively performed, 
 wherein a MODCOD which is a combination of the LDPC code word and the modulation scheme includes a MODCOD-A which is a MODCOD based on the block interleaving of the type A, and a MODCOD-B which is a MODCOD based on the block interleaving of the type B, 
 wherein when the block interleaving of the type A is performed on an LDPC code word of the MODCOD-B, the circuitry of the transmission apparatus performs the group-wise interleaving on the LDPC code word of the MODCOD-B such that a same block interleaving result as a block interleaving result obtained when the block interleaving of the type B is performed is obtained, and 
 when the block interleaving of the type B is performed on an LDPC code word of the MODCOD-A, the circuitry of the transmission apparatus performs the group-wise interleaving on the LDPC code word of the MODCOD-A such that a same block interleaving result as a block interleaving result obtained when the block interleaving of the type A is performed is obtained. 
   
     
     
         4 . A receiving method for use by a receiving device comprising:
 block deinterleaving which generates, from m bits of a symbol obtained from a digital broadcast signal transmitted from a transmission apparatus, a group-wise interleaved LDPC code word obtained by performing group-wise interleaving; and   group-wise deinterleaving which generates, from the group-wise interleaved LDPC code word obtained by performing the group-wise interleaving, an original LDPC code word,   wherein the digital broadcast signal transmitted from the transmission apparatus is processed in the transmission apparatus by circuitry configured to
 perform group-wise interleaving which interleaves the original LDPC code word to obtain a group-wise interleaved LDPC code word, 
 perform block interleaving which interleaves the group-wise interleaved LDPC code word to obtain a block interleaved and group-wise interleaved LDPC code word in such a manner that the group-wise interleaved LDPC code word obtained by performing the group-wise interleaving is written in m number of columns as storage regions arranged in a row direction, m bits are obtained by respectively reading the LDPC code word from m number of columns bit by bit, 
 perform mapping the block interleaved and group-wise interleaved LDPC code word to any one of 2m number of signal points defined by a modulation scheme, and 
 perform transmitting the digital broadcast signal including the mapped block interleaved and group-wise interleaved LDPC code word obtained by performing the group-wise interleaving, performing the block interleaving, and performing the mapping, 
 wherein a type of the block interleaving includes a type A in which writing of the group-wise interleaved LDPC code word obtained by performing the group-wise interleaving in a column direction of the columns is iteratively performed on m number of columns, and a type B in which the writing of the group-wise interleaved LDPC code word obtained by performing the group-wise interleaving in the row direction of m number of columns for every bit group is iteratively performed, 
 wherein a MODCOD which is a combination of the LDPC code word and the modulation scheme includes a MODCOD-A which is a MODCOD based on the block interleaving of the type A, and a MODCOD-B which is a MODCOD based on the block interleaving of the type B, 
 wherein when the block interleaving of the type A is performed on an LDPC code word of the MODCOD-B, the circuitry of the transmission apparatus performs the group-wise interleaving on the LDPC code word of the MODCOD-B such that a same block interleaving result as a block interleaving result obtained when the block interleaving of the type B is performed is obtained, and 
 when the block interleaving of the type B is performed on an LDPC code word of the MODCOD-A, the circuitry of the transmission apparatus performs the group-wise interleaving on the LDPC code word of the MODCOD-A such that a same block interleaving result as a block interleaving result obtained when the block interleaving of the type A is performed is obtained.