High-speed QC-LDPC encoder based on three-stage pipeline in deep space communication

Abstract

The invention provides a high-speed QC-LDPC encoder based on a three-stage pipeline in deep space communication. The encoder comprises a type-I backward iteration circuit, a high-density matrix and vector multiplier and a type-II backward iteration circuit. The high-density matrix and vector multiplier realizes high-density matrix and vector multiplication operation, and the type-I backward iteration circuit and the type-II backward iteration circuit both realize backward iteration operation. The whole encoding process is divided into three pipeline stages. The provided 1/2 code-rate high-speed QC-LDPC encoder in deep space communication has the advantages of simple structure, low cost and large throughput capacity and the like.

Description

technical field [0001] The invention relates to the field of channel coding, in particular to a high-speed QC-LDPC encoder based on a three-stage pipeline in a CCSDS deep space communication system. Background technique [0002] Low-Density Parity-Check (Low-Density Parity-Check, LDPC) code is one of efficient channel coding techniques, and quasi-cyclic LDPC (Quasi-Cyclic LDPC, QC-LDPC) code is a special LDPC code. Both the generation matrix G and the check matrix H of the QC-LDPC code are arrays composed of circulant matrices, which have the characteristics of a segmented cycle, so they are called QC-LDPC codes. The first row of the circulant matrix is ​​the result of the cyclic right shift of the last row by 1 bit, and the remaining rows are the result of the cyclic right shift of the previous row by 1 bit. Therefore, the circulant matrix is ​​completely characterized by its first row. Usually, the first row of a circulant matrix is ​​called its generator polynomial. [...

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This scheme has two disadvantages: one is that a large amount of memory is required, resulting in high

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