Abnormal LDPC code to MPEG-2TS hierarchical inequality protection method

A technology of MPEG-2TS and LDPC codes, which is applied in TV, electrical components, digital video signal modification, etc. It can solve the problems of key protection of MPEG-2TS stream, affecting system performance, and poor anti-error ability.

Inactive Publication Date: 2006-03-01
TSINGHUA UNIV
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  • Abstract
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Problems solved by technology

However, in the current major digital TV transmission standards and other transmission standards, there is no key protection for the header and adapta

Method used

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  • Abnormal LDPC code to MPEG-2TS hierarchical inequality protection method
  • Abnormal LDPC code to MPEG-2TS hierarchical inequality protection method
  • Abnormal LDPC code to MPEG-2TS hierarchical inequality protection method

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Embodiment Construction

[0066] By analyzing the selected irregular LDPC code structure, the degree distribution function of the information node of the irregular LDPC code is obtained, and the address of the information node with higher degree is further obtained. Map the packet header and adaptation field of the input MPEG-2TS code stream to the information nodes with higher irregular LDPC code degree. The MPEG-2TS code stream is sequentially input into the buffer, and then read out according to the address of the information node with a high irregular LDPC code degree, and the position of the header and the adaptation field in the MPEG-2TS code stream are adjusted, thereby realizing the header and the adaptation domain. The mapping from the configuration domain to the information node with high irregular LDPC code degree is easy to realize.

[0067] The header of the MPEG-2TS code stream has a fixed length of 4 bytes, but the length of the adaptation field is not fixed, which increases the difficul...

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Abstract

A gradation-inequality protective method of irregular LDPC code to MPEG-2TS includes address protective processing circuit at emitting end of communication system for storing node adding with high irregular LDPC code degree to let MPEG-2TS code stream packet head and adaptive domain map on node with high irregular LDPC code degree , adding protective counter processing circuit at receiving end of communication system for storing MPEG-2TS stream packet head and adaptive domain address to utilize this address to restore normal order of MPEG-2TS code stream.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, and particularly relates to the key protection of important information such as the packet header and the adaptation field of the MPEG-2TS code stream by using the hierarchical and unequal error protection capability of the irregular LDPC code. Background technique [0002] The LDPC code is a linear code based on a sparse check matrix, which was proposed by Gallager in 1962, and its check matrix is ​​sparse. When the parity check matrix of an LDPC code can be represented by a tanner graph, as shown in Figure 1, there are M nodes below the tanner graph, and each node represents a check bit of the codeword, called a check node; there are N nodes on the top, each A node represents an information bit, which is called an information node; the number of edges connected to each node is called the degree of the node. [0003] LDPC codes can be divided into regular LDPC codes and...

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Application Information

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IPC IPC(8): H04N7/26H04N19/67
Inventor 杨知行张杨潘长勇王军宋健
Owner TSINGHUA UNIV
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