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Method for forming mixed automatic request re-sending packet of low density parity check code

A low-density parity, hybrid automatic technology, applied in the field of digital communication, can solve problems such as representation and storage problems

Active Publication Date: 2007-07-25
ZTE CORP
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  • Application Information

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Problems solved by technology

[0018] If a basic matrix is ​​used for each different spreading factor LDPC code, then, for each different code length, the LDPC codec coder needs to store a basic matrix, and when the code length is a lot, it will be stored Many underlying matrices, so there are representation and storage issues

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  • Method for forming mixed automatic request re-sending packet of low density parity check code
  • Method for forming mixed automatic request re-sending packet of low density parity check code
  • Method for forming mixed automatic request re-sending packet of low density parity check code

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Embodiment Construction

[0137] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0138] As shown in Figure 3, the present invention provides a method A for generating a hybrid automatic repeat request HARQ packet of an Extending-and-Puncturing structured low-density parity-check code, and the method A includes the following steps :

[0139] A1), the low-density parity-check code encoder generates N according to the input K-bit information grouping FIR Bit LDPC HARQ mother code code word, described code word comprises bit information packet, expansion check bit group and puncture check bit group, the generated code word is sent to HARQ buffer (buffer);

[0140] A2), rearrange the LDPC HARQ mother code codeword bits in the HARQ buffer (buffer), keep the order of the information bits and the extended check bits unchanged, and change the order of the punctured check bits, in order to obtain an optimal punctured distribution;...

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Abstract

The method includes following steps: (1) based on inputted K bits information packet, encoder for low-density parity check code crates code word in NFIR bits LDPC HARQ parent code; the code word includes bit information packet, expanded check bit packet, and remaining check bit packet after deletion; the created code word is sent to HARQ buffer; (2) rearranging bits of code word of LDPC HARQ parent code in HARQ buffer, and keeping sequence of information bits and expanded check bits unchanged, and changing sequence of remaining check bits; (3) selecting bits code word in sequence from rearranged code word of HARQ parent code, i.e. first transmission starts up from first system bits, and then, start position of each transmission follows close to position of ending the previous transmission so as to generate binary sequence of HARQ packet.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a low density parity check code HARQ packet generation method. Background technique [0002] All digital communication systems require a channel encoder. The channel coder is to fight against all kinds of noise and interference in the transmission process. By artificially adding redundant information, the system has the ability to automatically correct errors, thereby ensuring the reliability of digital transmission. Low-density parity-check codes are a type of linear block codes that can be defined by a very sparse parity-check matrix or a bipartite graph. They were originally discovered by Gallager, so they are called Gallager codes. After decades of silence, with the development of computer hardware and related theories, MacKay and Neal rediscovered it and proved that it has performance close to the Shannon limit. The latest research shows that low-density parity-check c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/18H03M13/09
CPCH03M13/1102H03M13/618H03M13/6306H03M13/6393H04L1/0057H04L1/0068H04L1/1812
Inventor 徐俊袁志锋胡留军
Owner ZTE CORP
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