Correction decoding method for short-block-length low-bit-rate LDPC code of 5G-NR system

A 5G-NR and LDPC code technology, applied in the field of decoding, can solve the problem that the flat layer cannot meet the decoding performance requirements of the communication system, and achieve the effect that the complexity has no impact, and the complexity and decoding performance are balanced

Active Publication Date: 2021-06-29
SOUTHEAST UNIV
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Problems solved by technology

[0008] The technical problem of the present invention is to overcome the problem that the error floor of the conventional iterative decoding method of 5G-NR system with short block length and low code rate LDPC code cannot meet the decoding performance requirements of the communication system. Modified Decoding Method of Short Block Length and Low Code Rate LDPC Codes

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  • Correction decoding method for short-block-length low-bit-rate LDPC code of 5G-NR system
  • Correction decoding method for short-block-length low-bit-rate LDPC code of 5G-NR system
  • Correction decoding method for short-block-length low-bit-rate LDPC code of 5G-NR system

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[0027] Specifically, such as figure 1 As shown, the modified decoding method for the 5G-NR system short block length low code rate LDPC code of the present invention includes the following steps:

[0028] S101, a conventional iterative decoding algorithm, the NMS algorithm is selected in this embodiment.

[0029]S1011, iterative initialization: the number of initialization iterations k=0, the maximum number of iterations is K_MAX; for each variable node v n , n∈[1,N]; initialization:

[0030]

[0031] Among them, β is a constant fixed multiplicative correction factor; is the initial input approximate likelihood ratio information, is the variable node to the connected check nodes c m (m∈A(n)) the initial information delivered.

[0032] S1012, k=k+1.

[0033] S1013, update the check node: for each check node c m (m∈[1,M]), using the information passed by the corresponding variable node generated in the k-1th iteration Update the check node to the corresponding vari...

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Abstract

The invention relates to the technical field of decoding, in particular to a correction decoding method for a short-block-length low-bit-rate LDPC code of a 5G-NR system, and provides a correction decoding method for solving the leveling problem of decoding performance of the short-block-length low-bit-rate LDPC code of the 5G-NR system. When error code words output by a conventional iterative decoder, namely cyclic redundancy check (CRC) of an output information bit sequence, are not met, CRC detection is carried out on each flipping result by querying a table and using a cyclic correction mode, namely flipping decoding bits at a specified position, and the maximum repetition frequency is Z (an expansion factor of an LDPC code in a 5G-NR system), so that the error code words output by the conventional iterative decoder are subjected to cyclic redundancy check (CRC) detection, and if yes, an information bit sequence is output. According to the method, the decoding error floor of the short-block-length low-code-rate LDPC code of the 5G-NR system is effectively reduced under the condition that the algorithm complexity is slightly increased.

Description

technical field [0001] The present invention relates to the technical field of decoding, in particular to a modified decoding method for 5G-NR system short block length low code rate LDPC codes. Background technique [0002] LDPC codes, namely Low-Density Parity-Check (LDPC) codes, have become a research hotspot in the past 20 years because of their outstanding performance close to the Shannon limit. It was first proposed by Dr. Gallager in the 1960s, and was rediscovered by Mackey et al. in the 1990s after the appearance of Turbo codes and iterative decoding. Due to the low complexity of the LDPC decoding algorithm, flexible structure, and high-speed parallel decoding, it has been widely used in storage, WiFi, WiMax, digital broadcasting, optical fiber communication, and deep space communication. In 2016, LDPC code was adopted as the coding scheme for data services in the fifth-generation mobile communication technology enhanced mobile broadband scenario. [0003] (N,K)LD...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/11
CPCH03M13/1128
Inventor 姜明何海赵春明
Owner SOUTHEAST UNIV
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