Method for improving performance of LDPC (Low Density Parity Check) decoder by utilizing given information

Abstract

The invention relates to a method for improving performance of an LDPC (Low Density Parity Check) decoder by utilizing given information, which is suitable for the field of digital television reception technologies. The conventional decoder design method equally treats an information bit and a check bit which are included in an LDPC code word, and does not utilize the structural feature of the LDPC code word and the structural feature of the LDPC code. According to the method, information carried by a signaling domain of the LDPC code word is taken as the given information, and the highest degree of confidence is endowed in each iteration process, and the improved degree of confidence information is continuously transmitted to other associated information bits and check bits in the iteration process, so that the speed for iterative convergence is accelerated; and furthermore, the transmission process for the degree of confidence information of the given information to intervene the degree of confidence continuously is adjusted in the iterative process under the condition that the signal quality is critical, the accelerating convergence of the degree of confidence information is guided, the error correcting capability of the decoder is improved, and some code words which cannot be corrected by the existing decoding method are corrected.

Description

technical field [0001] The invention belongs to the technical field of digital television reception and relates to a method for improving the performance of an LDPC decoder by using known information. Background technique [0002] Since LDPC (Low Density Parity Check Code) has good error correction performance, it has been gradually and widely used in the field of digital TV transmission as a channel error correction code in recent years. The good error correction performance of LDPC comes from iterative decoding. During the iterative decoding process, the confidence information of the information bits and check bits of the LDPC codeword is continuously fed back and transmitted. After continuous iterations, the confidence information gradually converges. As the confidence The convergence decoding result of the information also converges gradually, and the LDPC decoder can obtain the correct decoding result when it converges. The convergence speed of the decoding result dete...

AI Technical Summary

Problems solved by technology

[0004] The existing decoder design method treats the information bits and check bits contained in the LDPC codeword equally without distinction, and does not take advantage of the structural characteristics of the LDPC codeword in the digital TV transmission system and the structural characteristics of the LDPC code itself.

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