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LDPC decoding method and storage medium

An LDPC code and decoding technology, applied in the field of channel decoding, can solve the problems of high decoding error rate and great performance degradation, and achieve the effect of reducing the decoding error rate

Active Publication Date: 2021-08-24
HEFEI INNOVATION RES INST BEIHANG UNIV
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Problems solved by technology

Under such non-ideal and non-Gaussian impulse noise channel, the performance of traditional soft-decision decoding algorithm is greatly degraded, and the decoding error rate is relatively high.

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  • LDPC decoding method and storage medium
  • LDPC decoding method and storage medium

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Embodiment Construction

[0046] In order to further illustrate the features of the present invention, please refer to the following detailed description and accompanying drawings of the present invention. The accompanying drawings are for reference and description only, and are not intended to limit the protection scope of the present invention.

[0047] Such as figure 1 , Figure 7 As shown, this embodiment discloses an LDPC code decoding method, including the following steps S1 to S6:

[0048] S1. Initialize the impulse noise channel, and convert the information of the received LDPC code signal into the log likelihood ratio information of the channel;

[0049] S2. Transmitting the log likelihood ratio information of the channel to the decoder, and outputting an iterative decoding soft information result;

[0050] S3. Using the EM algorithm based on gradient descent to process the decoded soft information result to obtain the estimated value of the current iterative channel parameter;

[0051] S4...

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Abstract

The invention discloses an LDPC decoding method and a storage medium, and belongs to the technical field of channel decoding, and the method comprises the steps: S1, initializing an impulse noise channel, and converting the information of a received LDPC signal into the log-likelihood ratio information of the channel; S2, transmitting log-likelihood ratio information of the channel to a decoder, and outputting a primary iterative decoding soft information result; S3, processing the decoding soft information result by using an EM algorithm based on gradient descent to obtain a current iteration channel parameter estimation value; S4, updating log-likelihood ratio information of the channel by using the channel parameter estimation value; and repeating the steps S2-S4 until the maximum number of iterations is met, and outputting a final decoding hard decision result. By the method, the precision of impulse noise channel estimation can be improved through transmission of soft information between channel estimation and the sum-product decoding algorithm, and therefore the LDPC decoding error rate under a time-varying and burst impulse noise channel is reduced.

Description

technical field [0001] The invention relates to the technical field of channel decoding, in particular to an LDPC code decoding method and a storage medium. Background technique [0002] With the completion of the Beidou-3 system and the broadcast of the new Beidou signals B1C and B2A, users' requirements for GNSS service quality are gradually increasing. For the receiver of the new system signal, the error-free transmission and signal quality of the navigation signal directly affect the accuracy and reliability of GNSS positioning. A good navigation signal is the guarantee for providing high-quality and high-stability services for subsequent positioning. In the new system of Beidou signals B1C and B2A, in order to prevent errors during signal transmission and improve the ability of signals to resist various interferences during transmission, error correction coding technology - LDPC code is applied. [0003] The navigation messages of the Beidou signals B1C and B2A in the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/11
CPCH03M13/1151
Inventor 赵洪博许憧冯文全
Owner HEFEI INNOVATION RES INST BEIHANG UNIV
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