Apparatus and method for decoding using channel code

An apparatus for decoding signals by using a channel code, the apparatus comprising:

• a receiving module for receiving signals encoded using a first parity check matrix of a low density parity check (LDPC) code, the first parity check matrix consisting of a plurality of z-by-z zero matrices and a plurality of z-by-z permutation matrices, wherein each of the plurality of z-by-z permutation matrices is formed by shifting each row or each column of a z-by-z identity matrix by a shift number in a specific direction, wherein z is a positive integer, and wherein the shift number is a non-negative integer;
• a parity check matrix generation module for generating a second parity check matrix by adjusting the order of rows or columns of the first parity check matrix, wherein the second parity check matrix is divided into X groups, each of the X groups consisting of Y columns, wherein X is a positive integer larger than 1, wherein Y is a positive integer larger than 1, wherein a number of columns of the second parity check matrix is equal to X*Y, and wherein at least one of the X groups includes at least one row of which every element is zero (0);
• and
• a decoding module for iteratively decoding the received signals for each of the X groups by using the second parity check matrix.

A method for encoding data using a low density parity check (LDPC) code, the method comprising:

• generating a second parity check matrix by adjusting the order of rows or columns of a first parity check matrix;
• encoding data to be transmitted, by using the generated second parity check matrix;
• and
• transmitting the encoded data,
• wherein the first parity check matrix consists of a plurality of z-by-z zero matrices and a plurality of z-by-z permutation matrices,
• wherein each of the plurality of z-by-z permutation matrices is formed by shifting each row or each column of a z-by-z identity matrix by a shift number in a specific direction,
• wherein z is a positive integer,
• wherein the shift number is a non-negative integer,
• wherein the second parity check matrix is divided into X groups, each of the X groups consisting of Y columns,
• wherein X is a positive integer larger than 1,
• wherein Y is a positive integer larger than 1,
• wherein a number of columns of the second parity check matrix is equal to X*Y, and
• wherein at least one of the X groups includes at least one row of which every element is zero (0).

An apparatus for encoding data using a channel code, the apparatus comprising:

• a parity check matrix generation module for generating a second parity check matrix by adjusting the order of rows or columns of a first parity check matrix;
• an encoding module for encoding data to be transmitted, by using the second parity check matrix;
• and
• a transmitting module for transmitting the encoded data,
• wherein the first parity check matrix consists of a plurality of z-by-z zero matrices and a plurality of z-by-z permutation matrices,
• wherein each of the plurality of z-by-z permutation matrices is formed by shifting each row or each column of a z-by-z identity matrix by a shift number in a specific direction,
• wherein z is a positive integer,
• wherein the shift number is a non-negative integer,
• wherein the second parity check matrix is divided into X groups, each of the X groups consisting of Y columns,
• wherein X is a positive integer larger than 1,
• wherein Y is a positive integer larger than 1,
• wherein a number of columns of the second parity check matrix is equal to X*Y, and
• wherein at least one of the X groups includes at least one row of which every element is zero (0).