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General LDPC decoder

A decoder and general-purpose technology, applied in the field of LDPC decoders, can solve problems such as incompatibility of LDPC code decoders, achieve good flexibility, improve reliability, and occupy less FPGA resources

Active Publication Date: 2011-02-16
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

The invention solves the problem of incompatibility of LDPC code decoders with different code lengths, and realizes the decoding of LDPC codes with different lengths with a general-purpose decoding structure

Method used

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Embodiment Construction

[0035] 1. The principle of the invention

[0036] Check Matrix H of Quasi-Cyclic LDPC Codes qc As shown in formula (1), each sub-matrix A i，j It is a b×b cyclic right shift permutation matrix or a b×b 0 matrix.

[0037]

[0038] Since the cyclic permutation matrix A i，j The form of is completely determined by the offset of the matrix, therefore, the mother matrix H can always be used b =[p(i,j)] m×n To represent the parity check matrix H qc , where p(i, j) is A i，j offset.

[0039] If p(i, j)>0, it means H qc The corresponding A in the matrix i，j is a permutation matrix with a rightward offset of p(i, j), that is, by cyclically shifting the identity matrix to the right by p(i, j) bits, A can be obtained i，j ;

[0040] If p(i, j)=0, it means A i，j is the unit matrix, that is, the unit matrix is ​​not cyclically shifted;

[0041] If p(i, j)i，j is a matrix of all 0s.

[0042] In this way, as long as the mother matrix is ​​stored in the design, the parity check mat...

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Abstract

The invention discloses a general LDPC (low-density parity check code) decoder, which comprises a dispatching module, an input module, a decoding module and an output module. The input module, the decoding module and the output module work independently under the control of the dispatching module by adopting a mode of a state machine, wherein the decoding module has general hardware design and can decode LDPC of different lengths.

Description

technical field [0001] The invention relates to an LDPC decoder, in particular to a universal LDPC decoder, and belongs to the technical field of decoding. Background technique [0002] With the continuous development of technologies such as deep space communication and mobile satellite communication, low signal-to-noise ratio communication has become an important direction for the development of communication technology. In order to be able to communicate reliably, high-gain channel coding has become an indispensable part of low signal-to-noise ratio communication systems. Among the error correction coding technologies invented and applied so far, only Turbo codes and LDPC codes have performance close to the Shannon limit. performance. Compared with Turbo codes, LDPC codes have obvious advantages in computing speed, decoding threshold and error floor, and become a research hotspot in the field of channel coding. The European Digital Television Broadcasting Organization (D...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/11
Inventor 杨磊龚险峰李雄飞惠腾飞赵雨侴胜男
Owner XIAN INSTITUE OF SPACE RADIO TECH
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