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Method for encoding channel of mixed automatic request retransmission and modulation mapping of LDPC code

一种LDPC码、混合自动的技术，应用在信号空间编码进行的检错、编码、编码元件等方向，能够解决编译码困难等问题

Active Publication Date: 2008-12-17
ZTE CORP
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Problems solved by technology

[0023] In IEEE802.16e, LDPC code supports code rate 1 / 2, code rate 2 / 3, code rate 3 / 4, and code rate 5 / 6. At this time, four basic matrices appear, and the only encoder / decoder It will become more difficult to realize encoding and decoding of different code rates; if four code rates require four codecs, hardware cost will become an application bottleneck

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  • Method for encoding channel of mixed automatic request retransmission and modulation mapping of LDPC code
  • Method for encoding channel of mixed automatic request retransmission and modulation mapping of LDPC code
  • Method for encoding channel of mixed automatic request retransmission and modulation mapping of LDPC code

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Embodiment Construction

[0133] The basic idea of ​​the present invention is to realize the support for HARQ based on the low-density parity-check code supporting any code length and any code rate, and the code word arrangement ensures that the code words generated by bit selection have an optimal puncture distribution, Word selection can be realized by a very simple circular buffer, and channel interleaving and modulation mapping can combine the characteristics of LDPC codewords to provide the largest constellation gain for codewords.

[0134] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0135]The HARQ channel coding and modulation mapping method of structured LDPC codes supporting any code rate / code length in this embodiment has a processing chain including LDPC coding, code word arrangement, bit selection, channel interleaving, and modulation mapping. Such as figure 2 As shown, the method specifically includes th...

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Abstract

A retransmitted channel coding of mixing automatic request of a low density parity check LDPC code is disclosed, comprising: (a) performing the structurization coding on the information bit sequence with the length K of the channel coder, transmitting the generated code word to the mixing automatic request retransmission HARQ buffer; (b) rearranging the code word bit of LDPC HARQ mother code in the HARQ buffer, then selecting the code word bit sequentially, generating the binary sequence of the HARQ pack; (c) mapping the code word bit of the HARQ pack to a planisphere, which ensures that the high-order bit of the coding block of the HARQ pack is mapped onto the bit of the planisphere with high reliability. The method of the invention provides largest planisphere gain for the LDPC code word, causing the LDPC HARQ channel coding with optimum performance.

Description

technical field [0001] The present invention relates to hybrid automatic retransmission (HARQ) of low-density parity-check (LDPC) codes, in particular to channel coding and modulation mapping processing method therein. Background technique [0002] All digital communication systems require channel coders, such as figure 1 shown. 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 ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04L1/00H03M13/00
CPCH03M13/116H03M13/1185H03M13/255H03M13/356H03M13/618H03M13/6306H03M13/6393H04L1/0057H04L1/007H04L1/0071H04L1/1812
Inventor 徐俊袁志锋胡留军
Owner ZTE CORP
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