Generating method of quality control (QC)-low density parity check (LDPC) check matrix based on longitudinal diagonal storage

A parity check matrix and vertical technology, applied in the field of channel coding, can solve the problems of 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

Method used

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  • Generating method of quality control (QC)-low density parity check (LDPC) check matrix based on longitudinal diagonal storage
  • Generating method of quality control (QC)-low density parity check (LDPC) check matrix based on longitudinal diagonal storage
  • Generating method of quality control (QC)-low density parity check (LDPC) check matrix based on longitudinal 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 relates to a generating scheme of a quality control (QC)-low density parity check (LDPC) check matrix of three different code rates in a digital terrestrial multimedia broadcasting (DTMB) system. A generating method of the QC-LDPC check matrix based on longitudinal diagonal storage is characterized in that a generating device of the QC-LDPC check matrix of the DTMB system is based on a longitudinal diagonal storage mechanism and comprises a block line table, a longitudinal diagonal ring shift right table, an index generator and a permutation matrix former. The generating method of the QC-LDPC check matrix based on the longitudinal diagonal storage is simple in process and easy to achieve. The generating method of the QC-LDPC check matrix based on the longitudinal diagonal storage has the advantages of being compatible in multi-code rate, capable of effectively reducing the requirement for a storer under the condition of keeping constant storing speed, little in resource consumption, small in power consumption, low in cost, and the like.

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 of generating H is to output the block row number i (0≤i<r) where each permutation matrix is ​​located block by column and It is relative to the number s of cyclic right shifts of the ident...

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Application Information

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IPC IPC(8): H03M13/11
Inventor 张鹏蔡超时刘蕾
Owner 苏州威士达信息科技有限公司
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