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LDPC codeword interleaving and mapping method and LDPC codeword de-interleaving and de-mapping method

A technology of LDPC codes and mapping methods, applied in digital transmission systems, electrical components, and error prevention, etc., can solve problems such as inability to form targeted constellation mapping methods of LDPC code words, and achieve system performance improvement and good system performance.

Inactive Publication Date: 2016-02-17
SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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AI Technical Summary

Problems solved by technology

[0003] The problem solved by the present invention is that it is impossible to form a targeted constellation mapping method for LDPC codewords of a specific code rate in the prior art

Method used

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  • LDPC codeword interleaving and mapping method and LDPC codeword de-interleaving and de-mapping method
  • LDPC codeword interleaving and mapping method and LDPC codeword de-interleaving and de-mapping method

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Embodiment Construction

[0010] The inventors found that in the prior art, it is impossible to form a targeted constellation mapping method for LDPC codes with a specific code rate.

[0011] In view of the above problems, the inventor provides an interleaving and mapping method and a de-interleaving and de-mapping method of LDPC codewords after research, and selects a specific mapping and de-mapping method for an LDPC code of a specific code rate to obtain better system performance. promote.

[0012] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0013] In the embodiment of the present invention, the transmitter end is as follows: firstly input the bit stream after information source encoding and BCH encoding to an LDPC encoder to encode an LDPC codeword with a specific code rate and code length, and then input i...

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Abstract

The invention discloses an LDPC codeword interleaving and mapping method and an LDPC codeword de-interleaving and de-mapping method. The method comprises the following steps: performing bit interleaving of a coded LDPC codeword according to a certain bit interleaving method and an interleaving pattern; and performing constellation mapping of the bit interleaved LDPC codeword according to a constellation diagram so as to obtain a symbolic stream. According to the technical scheme provided by the invention, specific mapping and de-mapping methods are selected for an LDPC code having a specific code rate, such that the system performance is improved better.

Description

technical field [0001] The invention relates to the technical field of digital television, in particular to an LDPC codeword interleaving and mapping method and a deinterleaving and demapping method. Background technique [0002] In existing broadcast communication standards, LDPC coding, bit interleaving and constellation mapping are the most common coding and modulation methods. In different transmission systems, LDPC coding, bit interleaving and constellation mapping all need to be designed separately and jointly debugged to achieve the best channel performance. Therefore, how to form a targeted constellation mapping method for an LDPC codeword of a specific code rate is a technical problem in the art. Contents of the invention [0003] The problem solved by the present invention is that in the prior art, it is impossible to form a targeted constellation mapping method for LDPC codewords of a specific code rate. [0004] In order to solve the above problems, an embodi...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L27/34
Inventor 张文军徐洪亮史毅俊徐胤郭序峰管云峰
Owner SHANGHAI NAT ENG RES CENT OF DIGITAL TELEVISION
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