Method of encoding structured low density check code

Abstract

The utility model discloses a structured encoding method of low density parity checking code encoder. The rows mb and lines mb basic matrix Hb that needs to contracture are confirmed according to the requirements of code rate and code length, the weight distribution of the matrix Hb is determined by the density evolution algorithm. An original basic matrix Hb<>MASK<> that matches and has the same structure with the with the basic matrix Hb is formed; a basic matrix Hb is generated according to the original matrix Hb<>MASK<> for storage; then the basic matrix Hb is modified to become a basic matrix Hb' so as to make all element value inside the modified basic matrix Hb'smaller than the extension factor Z of the low density parity code; the modified basic matrix Hb'is extended to gain the parity matrix H of the (mb is multipled by Z) row and (nb is multipled by Z)that is used in actual encoding. Finally, the data is encoded with the parity matrix H to obtain structured low density parity checking code. The coding method is simple and practical and a low density checking code that has a plurality of code length and excellent frame error rate performance.

Description

technical field [0001] The invention relates to an encoding method of an error-correcting code in a digital communication system, to be precise, relates to an encoding method of a structured low-density check code, and belongs to the technical field of communication. Background technique [0002] The environment of data transmission in wireless mobile communication is usually affected by various factors such as channel fading, inter-symbol interference and time-varying noise. The introduction of channel coding (also known as error correction code) is to use error correction codes at the sending end and the receiving end respectively. The purpose of encoding and decoding data is to add error correction protection to the transmitted data to improve and ensure the transmission quality of the digital communication system. From the perspective of the construction method of channel coding, the basic idea is to add some artificial redundant code elements-check codes to the informat...

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Problems solved by technology

[0016] However, how to construct such an LDPC code with as few short loops as possible and as large a shortest loop period as possible has not yet been well resolved, and has become a new focus of research and attention in the industry.

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