Method for constructing low density parity check (LDPC) code check matrix, and method and device for encoding LDPC code

A technology of LDPC code and parity check matrix, which is applied in the field of encoding devices, can solve problems such as the length of LDPC codes and the complexity of encoder implementation, and achieve the effects of solving storage problems, reducing implementation complexity, and improving link margin

Inactive Publication Date: 2011-04-20
TIMI TECH
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  • Claims
  • Application Information

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Problems solved by technology

And because the code length of the LDPC code is long, the implementation of the encoder is very complicated.

Method used

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  • Method for constructing low density parity check (LDPC) code check matrix, and method and device for encoding LDPC code
  • Method for constructing low density parity check (LDPC) code check matrix, and method and device for encoding LDPC code
  • Method for constructing low density parity check (LDPC) code check matrix, and method and device for encoding LDPC code

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specific Embodiment 1

[0037] Construct an LDPC code with code rate 1 / 4 suitable for CMMB system.

[0038] In order to be compatible with the physical layer structure of the CMMB system, the code length N is selected as 9216, that is to construct a check matrix H of 6912×9216 dimensions. In order to be compatible with the 1 / 2 and 3 / 4 code rate LDPC codes in the CMMB system, the expansion ratio K is selected as 256. Thus, the dimension of the fundamental matrix B is 27×36.

[0039] Select the row weight and column weight of the underlying matrix B. Preferably, the row redistribution of B is {λ 5 ,λ 4} = {2 / 27, 25 / 27}, the column redistribution is {ρ 10 , ρ 4 , ρ 3 , ρ 2} = {3 / 36, 3 / 36, 8 / 36, 22 / 36}.

[0040] Under the premise of satisfying the row weight and column redistribution, select the position of "1" in each row and column of the basic matrix B to ensure that the 27×27-dimensional sub-matrix composed of the last 27 columns of B is full rank, while avoiding Presence of short rings in B...

specific Embodiment 2

[0056] Construct an LDPC code with code rate 1 / 3 suitable for CMMB system.

[0057] In order to be compatible with the physical layer structure of the CMMB system, the code length N is selected as 9216, that is to construct a parity check matrix H of 6144×9216 dimensions. In order to be compatible with the 1 / 2 and 3 / 4 code rate LDPC codes in the CMMB system, the expansion ratio K is selected as 256. Thus, the dimension of the fundamental matrix B is 24×36.

[0058] Select the row weight and column weight of the underlying matrix B. Preferably, the row redistribution of B is {λ 5}={24 / 24}, the column redistribution is {ρ 10 , ρ 3 , ρ 2} = {4 / 36, 16 / 36, 16 / 36}.

[0059] Under the premise of satisfying the row weight and column redistribution, select the position of "1" in each row and column of the basic matrix B to ensure that the 24×24-dimensional sub-matrix composed of the last 24 columns of B is full rank, while avoiding Presence of short rings in B.

[0060] The bas...

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Abstract

The embodiment of the invention provides a method for constructing a low density parity check (LDPC) code check matrix. The method comprises the following steps of: constructing an MB*NB dimensional basic matrix B, which generates code rate R and code length N, of the LDPC code, wherein MB is equal to M / K, NB is equal to N / K, M is equal to N(1-R), K is divergence ratio of the basic matrix and belongs to phi, and phi is a set of common factors of M and N; substituting a K*K matrix for elements in the basic matrix B; and expanding the basic matrix B to be an M*N dimensional check matrix H which is used for encoding or decoding the LDPC code. The embodiment of the invention also provides a method and a device for encoding the LDPC code. According to the technical scheme provided by the embodiment of the invention, the LDPC code with any code rate and excellent performance can be constructed. In addition, the technical scheme provided by the embodiment of the invention solves the storage problem of the check matrix and effectively reduces the implementation complexity of an encoder.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular, the present invention relates to a construction method of an LDPC code parity check matrix, an LDPC code encoding method and an encoding device. Background technique [0002] In Shannon's famous "Mathematical Theory of Communication", he clarified that the way to achieve reliable transmission in noisy channels is coding. He proposed the maximum rate at which information can be transmitted in a noisy channel, that is, the channel capacity; at the same time, he also deduced the minimum signal-to-noise ratio value required for information to be transmitted without error, which is called the Shannon limit. Although Shannon's channel coding theory gives the ultimate performance of the best coding, it does not give a specific coding scheme. Based on this, people have been working on finding a coding scheme whose performance is close to Shannon's limit. [0003] The LDPC co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H03M13/11
CPCH03M13/036H03M13/116H03M13/118H04L1/0057
Inventor 刘斌彬白栋葛啟宏陶涛王军伟陈文姜红旗
Owner TIMI TECH
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