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Method for generating RC-LDPC code check matrix

A check matrix and matrix technology, applied in the field of channel coding, to achieve the effect of improving throughput and bit error performance

Active Publication Date: 2017-10-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Application Information

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Problems solved by technology

[0008] The present invention aims at the defects of the existing RC-LDPC codes in terms of computational complexity and rate adaptation, and proposes a method for constructing a check matrix of RC-LDPC codes based on PEG expansion

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  • Method for generating RC-LDPC code check matrix

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Embodiment Construction

[0068] Below in conjunction with accompanying drawing and embodiment, describe technical solution of the present invention in detail:

[0069] The present invention is a construction method of a rate-compatible LDPC code based on PEG extension, which constructs a check matrix under each sub-code rate by combining the method of keeping the information bit length unchanged and optimizing the PEG algorithm. In this method, a generation method of incremental parity bits is designed, and then a code with a low code rate is obtained, which realizes rate compatibility and avoids the degradation of decoding performance caused by puncturing.

[0070] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings.

[0071] The rate-compatible and compatible encoding is a nested sequence code, in which the check bits of the higher code rate are embedded into the check bits of the low-rate c...

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Abstract

The present invention belongs to the technical field of channel coding and relates to a method for generating an RC-LDPC code check matrix. The method is based on the complexity of the coding, and is modified based on the PEG algorithm to construct a check matrix with a lower triangular form. The obtained coding complexity is linear. On this basis, the method of expanding the check bit step by step is adopted to support the flexible and variable code rate, which provides a feasible channel coding method for the adaptation of a wireless link. At the same time, the obtained series of sub-codes also have a lower triangular form, which almost does not increase the complexity but can achieve linear coding with regard to the mother code. According to the invention, the method utilizes the PEG algorithm to optimize the position of the nonzero element in the expanded part and optimizes the code structure so as to eliminate the short loop, to reduce the computational complexity of the codec and to further improve the transmission performance.

Description

technical field [0001] The invention belongs to the technical field of channel coding, and relates to a method for generating a check matrix of an RC-LDPC code. Background technique [0002] In traditional communication systems, in order to ensure the reliability of communication transmission, the transmission mode is usually designed according to relatively poor channel conditions. In the case of relatively good channel conditions, it is a great waste of resources and greatly affects the data transmission rate. Therefore, in a time-varying channel, channel coding must not only have a strong error correction capability, but also be able to dynamically adjust the code rate of the transmitted code word according to the current state of the channel, so that the structural design of the channel coding has more advantages. high demands. [0003] In order to provide different quality of service to adapt to different transmission environments, the communication system needs the c...

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Application Information

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IPC IPC(8): H03M13/11
CPCH03M13/1148
Inventor 甘柳月史治平
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA