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

A deep space communication and pipeline technology, applied in the field of channel coding, can solve the problems of high circuit cost, large memory, slow coding speed, etc., and achieve the effect of improving throughput, reducing memory and improving coding speed.

Inactive Publication Date: 2015-12-09
RONGCHENG DINGTONG ELECTRONICS INFORMATION SCI & TECH CO LTD
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Problems solved by technology

This scheme has two disadvantages: one is that a large amount of memory is required, resulting in high circuit cost; the other is that the information bits are serially input, and the encoding speed is slow

Method used

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

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Embodiment Construction

[0020] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0021] The row and column weights of a circular matrix are the same, denoted as w. If w=0, then the circulant matrix is ​​an all-zero matrix. If w=1, then the circulant matrix is ​​permutable, called a permutation matrix, which can be obtained by cyclically shifting the identity matrix I to the right by several bits. The check matrix H of the QC-LDPC code is composed of c×t b×b order circulant matrices H j,k (1≤j≤c, 1≤k≤t, t=e+c) constitute the following array:

[0022]

[0023] Usually, any circulant matrix in the parity check matrix H is either an all-zero matrix (w=0) or a permutation matrix (w=1). Let the circular matrix H j,k the firs...

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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. [...

Claims

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Application Information

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IPC IPC(8): H03M13/11
Inventor 张鹏
Owner RONGCHENG DINGTONG ELECTRONICS INFORMATION SCI & TECH CO LTD
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