Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com