LDPC encoder for secondary level full parallel input ring shift left in deep space communication

A deep space communication and encoder technology, applied in the field of QC-LDPC encoder, can solve the problems of low throughput, long addition delay, and low operating frequency of the encoder

Inactive Publication Date: 2017-04-19
RONGCHENG DINGTONG ELECTRONICS INFORMATION SCI & TECH CO LTD
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Problems solved by technology

[0006] The existing all-parallel input solution for the 8 / 11 code rate QC-LDPC encoder in the deep space communication standard is as follows: figure 1 As shown, the main disadvantage of this scheme is that the modulo 2 adder has e×b input terminals, and the delay of the addition operation is long, which will cause the encoder to have low operating frequency and low throughput

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  • LDPC encoder for secondary level full parallel input ring shift left in deep space communication
  • LDPC encoder for secondary level full parallel input ring shift left in deep space communication
  • LDPC encoder for secondary level full parallel input ring shift left in deep space communication

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[0014] 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.

[0015] 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:

[0016]

[0017] 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 QC-LDPC encoder based on a secondary pipeline in deep space communication. The encoder comprises a sparse matrix and vector multiplier and a vector and high-density matrix multiplier. The sparse matrix and vector multiplier realizes sparse matrix and vector multiplication. The vector and high-density matrix multiplier uses a full parallel input ring shift left mechanism to realize vector and high-density matrix multiplication. The whole coding process is divided into two levels of pipeline. According to the invention, the 8/11 bit rate QC-LDPC encoder in a deep space communication system has the advantages of high operating frequency, high throughput and the like.

Description

technical field [0001] The invention relates to the field of channel coding, in particular to a QC-LDPC coder with two-stage fully parallel input cyclic left shift in a 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 (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. [0003] The commun...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/11
CPCH03M13/116
Inventor 张鹏
Owner RONGCHENG DINGTONG ELECTRONICS INFORMATION SCI & TECH CO LTD
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