Generation method for Quasic Low-Density Parity-Check (QC-LDPC) check matrix based on transverse diagonal storage

A parity check matrix and horizontal technology, applied in the field of channel coding, can solve problems such as multi-memory and increased equipment cost

Inactive Publication Date: 2013-02-13
苏州威士达信息科技有限公司
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Problems solved by technology

If the QC-LDPC check matrix of DTMB is generated by the conventional method, the diagonal characteristic of H cannot be fully utilized, and more memory is required, which increases the cost of the equipment

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  • Generation method for Quasic Low-Density Parity-Check (QC-LDPC) check matrix based on transverse diagonal storage
  • Generation method for Quasic Low-Density Parity-Check (QC-LDPC) check matrix based on transverse diagonal storage
  • Generation method for Quasic Low-Density Parity-Check (QC-LDPC) check matrix based on transverse diagonal storage

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0016] The check matrix H of the QC-LDPC code is an array composed of circulant matrices, which has the feature of segmented cyclic. From the perspective of rows, each row of the circulatory matrix is ​​the result of the previous row (the first row is the last row); from the perspective of columns, each column of the circulatory matrix is ​​the result of the previous column (the first row is the last row). column) the result of circularly shifting down one bit. The set of row vectors of a circulant matrix is ​​exactly the same as the set of column vectors. Therefore, a circulant matrix can be completely characterized by its first row or column. The row and column weights of a circular matrix are the same, denoted as w. If w=0, then the circulant matrix is ​​an all-zero matrix. If w=1, then th...

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Abstract

The invention discloses a generation method for a Quasic Low-Density Parity-Check (QC-LDPC) check matrix based on transverse diagonal storage and relates to a generation scheme for a QC-LDPC code check matrix with three different code rates in a Digital Terrestrial Multimedia Broadcasting (DTMB) system. The method is characterized in that a generation device of the QC-LDPC code check matrix of the system mainly consists of a block list, a transverse diagonal rotational right meter, an index generator and a permutation matrix forming machine based on a transverse diagonal storage mechanism. The method is simple in process and easy to implement. The generation device of the QC-LDPC code check matrix has the advantages of being compatible with multi-rates, capable of reducing demands of a memory effectively on the condition that the processing speed is not changed, little in source consumption, low in energy consumption and low in cost.

Description

technical field [0001] The invention relates to the field of channel coding, in particular to a method for efficiently generating a check matrix of a QC-LDPC code in a DTMB system. Background technique [0002] Quasic Low-Density Parity-Check (QC-LDPC) code is an efficient channel coding technique. The check matrix H of the QC-LDPC code is an array composed of r×c b×b order circulant matrices, the number of block rows is r, the number of block columns is c, and the order of the circulant matrix is ​​b. A circulant matrix is ​​usually an all-zero matrix or a permutation matrix. H is used for coding at the sending end and decoding at the receiving end. [0003] Usually, the check matrix H of the QC-LDPC code only has an all-zero matrix and a permutation matrix. The conventional method for generating H is to output the column number j of each permutation matrix row by block (0≤j<c) and It is relative to the number s of cyclic right shifts of the identity matrix (0≤s<b)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/11
Inventor 张鹏蔡超时林子良
Owner 苏州威士达信息科技有限公司
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