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

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...

AI Technical Summary

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 adaptation field of the MPEG-2TS stream, resulting in poor anti-error capability of these important information, thus affecting the performance of the system

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