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LDPC-BCH (Low-density Parity-Check Code-Broadcast Channel) grid-based low-bit rate coding method

A technology of LDPC code and BCH code, applied in the field of communication channel coding

Active Publication Date: 2013-06-12
TSINGHUA UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

However, generalized LDPC codes with excellent performance still face many design problems, such as the selection of alternative short subcodes and the grid correspondence between short subcodes and LDPC codes.

Method used

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  • LDPC-BCH (Low-density Parity-Check Code-Broadcast Channel) grid-based low-bit rate coding method
  • LDPC-BCH (Low-density Parity-Check Code-Broadcast Channel) grid-based low-bit rate coding method
  • LDPC-BCH (Low-density Parity-Check Code-Broadcast Channel) grid-based low-bit rate coding method

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Experimental program
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Embodiment Construction

[0040] The embodiment of the low code rate coding method based on LDPC-BCH grid proposed by the present invention, its flow is as follows image 3 As shown, the method adopts the BCH code constraint to replace the parity check code constraint in the conventional LDPC grid to expand the check sequence, and the method includes the following steps:

[0041] 1) Perform LDPC encoding:

[0042] Let the parity check matrix H of LDPC L for M L ×N L Dimensions, input a length K L =N L -M L information sequence a L =[a(0),a(1),…,a(K L -1)], after LDPC encoding, a length of N L The LDPC code word c L =[p L ,a L ], where p L =[p(0),p(1),...,p(M L -1)] is the generated LDPC code check sequence;

[0043] The relationship between the check matrix and the code word of the LDPC code can be expressed as:

[0044] H L · c L T = 0 ...

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Abstract

The invention relates to an LDPC-BCH (Low-density Parity-Check Code-Broadcast Channel) grid-based low-bit rate coding method, which belongs to the technical field of communication channel coding. The method includes the following steps: non-systematic BCH code constraints are adopted to replace parity check code constraints in the conventional LDPC grid in order to extend a check sequence; a method, such as LDPC information bit deletion, check bit deletion or BCH transmission bit deletion, is carried out on the obtained LDPC-BCH code, and thereby variable-code length, variable-bit rate low-bit rate LDPC-BCH coding is implemented. The coding method provided by the invention has excellent performance approximating the Shannon theoretical limit, and moreover, the coding method can be implemented with lower complexity, and has a broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of communication channel coding, and in particular relates to a low code rate based on LDPC-BCH grid, a code design method with low complexity and variable code length and code rate, which is a method for correcting channel Efficient coding method for erroneous data. Background technique [0002] In a digital communication system, errors often occur due to random noise or other disturbances during the transmission or storage of information bits. Channel coding and decoding technology is the key technology to effectively eliminate data transmission and storage errors and ensure the reliability of communication system data. Low bit rate coding can be applied to communication with extremely low signal-to-noise ratio, and has great demands in complex electromagnetic environments such as communication in mountainous areas and dense forests. It is a hot and difficult point in the research and application of chann...

Claims

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Application Information

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IPC IPC(8): H03M13/11H03M13/15
Inventor 殷柳国李琪陆建华
Owner TSINGHUA UNIV
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