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Minimal sum decoding method based on grading excursion correction

A decoding and minimal technology, applied in the decoding field of channel error correction coding, can solve the problems of poor performance, robust channel estimation parameters, and high complexity of the sum-product algorithm, achieving close performance, high accuracy, and computational complexity. falling effect

Inactive Publication Date: 2006-05-10
SOUTHEAST UNIV
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Problems solved by technology

[0004] Technical problem: the purpose of this invention is to provide an improved check node output information correction method (minimum sum decoding method based on segmentation offset correction), which solves the problem of the existing simplified LDPC code soft decision decoding method The performance of the long irregular code is poor, and the complexity of the existing sum-product algorithm is still high; at the same time, the method is more robust to the channel estimation parameters

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  • Minimal sum decoding method based on grading excursion correction
  • Minimal sum decoding method based on grading excursion correction
  • Minimal sum decoding method based on grading excursion correction

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[0043] According to the minimum sum decoding method of the low density parity check code based on segment offset correction in the present invention, the minimum value of the output information reliability of the check node is different, and the parameters defined by the segment are used to respectively calculate the minimum sum of the output The small reliability information is corrected and offset, that is, the operation unit of the check node performs multiplication according to the sign of the input signal to obtain the total output symbol, and at the same time compares the minimum value according to the absolute value of the signal, and the next minimum value corresponds to the minimum value Enter the serial number; according to the magnitude of the minimum value, look up the table to obtain the corresponding correction factor, and use this factor to make offset corrections for the minimum value and the second minimum value; check the reliability of the information output b...

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Abstract

This invention relates to section bias amending minimum and coding method suitable for low density LDPC code flexible coding, which comprises the following steps: using the channel received information as variable joint to send out correction joint information adn to fetch input information for computation and comparing the resolute values for minimum and secondary information reliability; then according to minimum amplitude to selecting minimum value and secondary amending factors from section list; then outputting to the variable joint to receive the information as overlap judging soft information to judge whether the sequence satisfies the test equation and if not then updates output information and enters next overlap codes.

Description

technical field [0001] The invention relates to a simplified decoding method for soft-judgment iterative decoding of low-density parity check codes, and belongs to the technical field of channel error correction coding decoding. Background technique [0002] Among the decoding methods of LDPC codes, the iterative soft-decision decoding method based on bipartite graph has a good bit error rate performance. For longer irregular LDPC codes, the performance close to the Shannon limit can be achieved. The standard soft-decision algorithm is called the sum product algorithm. When the algorithm calculates the information output of the check node, whether it is decoding in the probability domain or the log likelihood ratio domain, it always involves a large number of additions, multiplications, Logarithmic and exponential operations, plus a large number of nodes, make the operation more complex. The minimum-sum decoding method is a simplification of the algorithm, directly using th...

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Application Information

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IPC IPC(8): H03M13/11
Inventor 姜明赵春明尤肖虎黄鹤蒋良成
Owner SOUTHEAST UNIV
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