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High-speed qc-ldpc encoder based on four-stage pipeline in dtmb

A pipeline and encoder technology, applied in the field of channel coding, can solve the problems of high circuit cost, slow coding speed, large memory, etc., and achieve the effects of increasing throughput, increasing coding speed, and reducing memory.

Inactive Publication Date: 2018-06-19
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 four-stage pipeline in dtmb
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  • High-speed qc-ldpc encoder based on four-stage pipeline in dtmb

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Embodiment Construction

[0022] 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.

[0023] 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:

[0024]

[0025] 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 four-stage pipeline in DTMB, the encoder includes a multiplier of a sparse matrix and a vector, an I-type backward iterative circuit, and a high-density matrix and vector multipliers and a Type II backward iteration circuit. The sparse matrix-vector multiplier realizes the sparse matrix-vector multiplication operation, the high-density matrix-vector multiplier realizes the high-density matrix-vector multiplication operation, and both Type I and Type II backward iteration circuits implement backward iteration operations. The whole encoding process is divided into 4 pipelines. The 4 / 5 code rate high-speed QC-LDPC encoder in the DTMB system provided by the invention has the advantages of simple structure, low cost, large throughput and the like.

Description

technical field [0001] The invention relates to the field of channel coding, in particular to a high-speed QC-LDPC coder based on a four-stage pipeline in a DTMB 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 DTMB standard adopts the QC-LDPC code ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M13/11
Inventor 张鹏刘志文张燕
Owner RONGCHENG DINGTONG ELECTRONICS INFORMATION SCI & TECH CO LTD
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