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Simplified Log-BP iterative decoding method based on equal-chord-length straight line approximation

A linear approximation and iterative decoding technology, applied in the field of decoding, can solve the problem of balance between complexity and bit error performance, and achieve the effect of reducing computational complexity, simple hardware implementation, and small performance loss.

Inactive Publication Date: 2014-10-08
XIDIAN UNIV
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  • Application Information

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Problems solved by technology

This method can reduce the complexity of the classic Log-BP algorithm, but there is still room for the existing technology to balance the complexity and bit error performance

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  • Simplified Log-BP iterative decoding method based on equal-chord-length straight line approximation
  • Simplified Log-BP iterative decoding method based on equal-chord-length straight line approximation
  • Simplified Log-BP iterative decoding method based on equal-chord-length straight line approximation

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Embodiment Construction

[0010] In one embodiment, the present invention discloses the following technical solution: a simplified Log-BP iterative decoding method based on equichord straight line approximation, the method is used for decoding binary LDPC codes, characterized in that the The method uses the straight line obtained based on the principle of equichord straight line approximation to replace the hyperbolic tangent function and inverse hyperbolic tangent function in the classical Log-BP algorithm.

[0011] As far as this embodiment is concerned, the key point is that the inventor introduced the principle of equichord straight line approximation into the field of Log-BP iterative decoding for the first time, thereby simplifying the existing technical scheme: by using the equichord long line approximation principle to obtain The straight line to replace the hyperbolic tangent function and the inverse hyperbolic tangent function in the classic Log-BP algorithm. Compared with the correlation cal...

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Abstract

The invention discloses a simplified Log-BP iterative decoding method based on equal-chord-length straight line approximation. The method is used for decoding binary LDPC codes and mainly characterized in that a straight line is obtained according to the equal-chord-length straight line approximation principle to replace a hyperbolic tangent function and an inverse hyperbolic tangent function in the classical Log-BP algorithm. As is shown in simulation results and analysis, compared with the classical Log-BP algorithm, the computation complexity of the equal-chord-length simplified algorithm is greatly lowered, hardware implementation is easier, and performance loss is smaller. Under the condition of the same complexity, the error bit ratio of the equal-chord-length simplified algorithm is lower than that of existing similar simplified algorithms like the SSP algorithm.

Description

technical field [0001] The invention relates to the field of decoding, in particular to a simplified Log-BP iterative decoding method based on equichord straight line approximation. Background technique [0002] Due to its good performance, the LDPC code has become the standard of the second generation digital satellite TV broadcasting (DVB-S2), WLAN and WIMAX communication. The sum-product (SP) algorithm in the LDPC decoding algorithm is also called the confidence (BP) algorithm, which has a good bit error rate performance. Log-BP algorithm makes full use of the properties of check nodes and information nodes and all the information of the received sequence, so that the decoding performance close to Shannon limit can be obtained. However, the hyperbolic tangent function tanh(x) and the inverse hyperbolic tangent function tanh must be calculated in the check node update -1 (x), increasing the complexity of the algorithm. [0003] In the hyperbolic tangent function tanh (x...

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Application Information

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IPC IPC(8): H03M13/11
Inventor 李卓邢莉娟万玉洁
Owner XIDIAN UNIV