Construction method of LDPC code check matrix

A technology of LDPC code and check matrix, applied in the field of 5G channel coding, can solve the problem that LDPC code is difficult to guarantee excellent performance

Active Publication Date: 2018-12-11
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

[0023] To sum up, under the existing technology, the low code rate (<1 / 3) part of LDPC code has high design flexibility, and it is difficult for LDPC code to guarantee excellent performance in this code rate range

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  • Construction method of LDPC code check matrix
  • Construction method of LDPC code check matrix
  • Construction method of LDPC code check matrix

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Embodiment Construction

[0115] In order to find a set of LDPC code design methods that support multiple code rates and multiple information sequence lengths and have low storage complexity, in the embodiment of the present invention, the following design scheme is adopted: first generate a low code rate (<1 / 3) part The row weight ω satisfies the basic model graph of the set range A≤ω≤B, and then the basic matrix is ​​obtained based on the basic model graph and the constructed original circulant coefficient matrix. Finally, according to each specified code rate, from the basic matrix The corresponding sub-matrix is ​​intercepted and expanded into a corresponding parity check matrix.

[0116] Based on the preset number of information bit columns in the schema map and the size of the preset schema graph, generate a corresponding schema graph, and then, based on the obtained schema graph, select the corresponding number of rows from the original cyclic coefficient matrix Part of the cyclic coefficient ma...

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Abstract

The invention relates to a 5G channel coding technology, in particular to a construction method of an LDPC code check matrix, which is used for improving the system transmission performance. The method comprises the steps of generating a base graph with a low code rate fraction, of which the row weight satisfies a preset range, and determining a part of the base graph which needs to be used on thebasis of the specified code rate and the base graph, adopting a cyclic permutation matrix determined based on the expansion factors to expand the cyclic coefficient corresponding to the non-zero element in the part of the base graph to obtain a corresponding check matrix. In this way, the row weight of the low code rate fraction is defined in the designed base graph. The transmission performanceof the check matrix obtained according to the circulation coefficient corresponding to the base graph in the application process is guaranteed. The design scheme is simple and easy to implement, the storage complexity is not increased, the subsequent operation and maintenance cost is not increased. The multiple code rates and support information bit lengths in the information transmission processcan be effectively supported, so that the transmission performance of the system can be improved to the maximum extent.

Description

technical field [0001] This application relates to 5G channel coding technology, in particular to the construction method of LDPC code parity check matrix. Background technique [0002] At present, as the 4th Generation mobile communication technology (4G) enters the stage of large-scale commercial use, the future-oriented 5th Generation mobile communication technology (5G) has become a global research and development hotspot. [0003] In the 5G New Radio (NR) design, the data channel of the enhanced Mobile Broadband (eMBB) scenario decided to use the Low Density Parity CheckCode (LDPC) code instead of the original Long Term Evolution (LTE). Turbo code adopted by LTE). [0004] 5G NR defines three typical application scenarios: enhanced mobile broadband (eMBB, enhanced MobileBroadband), massive Machine Type Communications (mMTC) and Ultra-Reliable and Low Latency Communications (Ultra-Reliable and Low Latency Communications, URLLC). LDPC codes have been selected as the co...

Claims

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Application Information

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IPC IPC(8): H03M13/11
CPCH03M13/1157H03M13/11
Inventor 李华安王加庆白宝明孙韶辉
Owner DATANG MOBILE COMM EQUIP CO LTD
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