LDPC coder for two-level part parallel input, right shift and accumulation in DTMB

An encoder and accumulator technology, applied in the field of channel coding, can solve the problems of large memory, high circuit cost, slow coding speed, etc.

Inactive Publication Date: 2017-03-08
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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  • LDPC coder for two-level part parallel input, right shift and accumulation in DTMB
  • LDPC coder for two-level part parallel input, right shift and accumulation in DTMB
  • LDPC coder for two-level part parallel input, right shift and accumulation in DTMB

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Embodiment Construction

[0015] 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.

[0016] 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:

[0017]

[0018] 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 coder based on two-level pipelines in DTMB. The coder comprises a sparse matrix and vector multiplier and a vector and high-density matrix multiplier; the sparse matrix and vector multiplier is used for realizing multiplication of a sparse matrix and a vector; and the vector and high-density matrix multiplier is used for realizing multiplication of a vector and a high-density matrix by adopting a part parallel input, right shift and accumulation mechanism. The whole coding process is divided into two-level pipelines; and the QC-LDPC coder having the 4/5 code rate in the DTMB system provided by the invention has the advantages of being low in cost, high in throughput capacity 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 partial parallel input right-shifting and accumulating 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 stand...

Claims

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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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