Construction method of QC-LDPC (Quasi-Cyclic Low-Density Parity-Check) codes for code modulation and code modulation method

A construction method and encoding and modulation technology, applied in the field of encoding and modulation, can solve problems such as difficult integration and optimization, and high complexity of hardware implementation

Active Publication Date: 2013-01-30
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0025] The purpose of the present invention is to provide a method for constructing a QC-LDPC code for encoding and modulation and a method for encoding and modulating, so as to solve the difficul

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  • Construction method of QC-LDPC (Quasi-Cyclic Low-Density Parity-Check) codes for code modulation and code modulation method
  • Construction method of QC-LDPC (Quasi-Cyclic Low-Density Parity-Check) codes for code modulation and code modulation method
  • Construction method of QC-LDPC (Quasi-Cyclic Low-Density Parity-Check) codes for code modulation and code modulation method

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Embodiment 1

[0150] The multi-code-rate and multi-code-length QC-LDPC code constructed in this embodiment includes FEC forward error correction coding with 4 kinds of code rates and 2 kinds of code lengths:

[0151] 1. 1 / 2-b128 code (15360, 7680) and 1 / 2-b512 code (61440, 30720) with a code rate of 1 / 2, these two codes have the same offset address matrix, recorded as:

[0152] E ( 1 / 2 ) = [ e i , j ( 1 / 2 ) ] 60 × 120 ,

[0153] The difference is that the former parameter b=128 and the latter parameter b=512;

...

Embodiment 2

[0191] This embodiment slightly improves the shift index of the b=128 short code in embodiment 1:

[0192] S1, in embodiment 1, the offset address matrix of obtained 4 kinds of coding rates is:

[0193] code rate 1 / 2 E ( 1 / 2 ) = [ e i , j ( 1 / 2 ) ] 60 × 120 ,

[0194] E with code rate 2 / 3 = ( 2 / 3 ) [ e ...

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Abstract

The invention discloses a construction method of QC-LDPC (Quasi-Cyclic Low-Density Parity-Check) codes for code modulation, and a code modulation method. The construction method comprises the following steps of: constructing a mother code offset address matrix E of the QC-LDPC codes, and setting a submatrix order to be b; constructing offset address matrixes of the QC-LDPC codes with different code rates on the basis of the matrix E and by virtue of line division and merger properties of a unit shift matrix; and generating the QC-LDPC codes with the different code rates according to the offset address matrixes of the QC-LDPC codes with the different code rates and the submatrix order b. The code modulation method adopts the construction method to generate the QC-LDPC codes and then performs coding and modulation on information bits. According to the technical scheme provided by the invention, the code modulation method fully utilizes line merge codes and excellent properties of part of the line merge codes, can effectively improve the flexibility, expandability and multi-service applicability of a code modulation system on the premise of obtaining the excellent properties, and can ensure a relatively low hardware implementation complexity.

Description

technical field [0001] The invention relates to the technical field of digital channel coding, in particular to a construction method of a QC-LDPC code used for coding and modulation and a coding and modulation method. Background technique [0002] Low Density Parity Check (Low Density Parity Check, LDPC) code is a kind of special linear block code based on sparse check matrix proposed by Robert G. Gallager in 1962. It is usually described by a parity check matrix H, and the nullification space of H is the codeword space of the LDPC code. Its main feature is that H is sparse. LDPC code not only has good performance close to the Shannon limit, but also has low decoding complexity, high throughput, and flexible structure. It is a research hotspot in the field of channel coding in recent years. Satellite digital multimedia broadcasting and other fields. LDPC code has become a strong competitor for the channel coding scheme of the fourth generation wireless mobile communicatio...

Claims

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Application Information

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IPC IPC(8): H04L1/00
Inventor 彭克武范力文潘长勇宋健杨知行
Owner TSINGHUA UNIV
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