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Multi-system orthogonal signal low-density check code coding/decoding method

A low-density check code and low-density check technology, which is applied in the fields of digital modulation and demodulation, soft-decision decoding, and error control coding, and can solve the requirements that cannot meet the requirements of higher information transmission rates, the system implementation is complex, and the decoding problems such as large complexity, to achieve the effect of improving computing efficiency and storage efficiency, improving iterative efficiency, and overcoming the complexity of updating

Inactive Publication Date: 2014-05-21
XIDIAN UNIV
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Problems solved by technology

The shortcomings of this patented technology are: the use of interleaver for random interleaving, the delay is large, and the whole system is complicated
The shortcomings of this method are: the use of BPSK modulation technology cannot meet the demand for higher information transmission rates; the use of logarithmic domain belief propagation algorithm decoding complexity is large

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  • Multi-system orthogonal signal low-density check code coding/decoding method
  • Multi-system orthogonal signal low-density check code coding/decoding method
  • Multi-system orthogonal signal low-density check code coding/decoding method

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings.

[0042] combined with figure 1 The specific steps to realize the present invention are described as follows:

[0043] Step 1, generate a multi-ary low-density check matrix.

[0044] A binary low-density check matrix is ​​generated by using the step-by-step edge growth method, and a multi-ary low-density check matrix is ​​obtained by using a random replacement method for this matrix. Random replacement refers to the non-zero elements of the binary low-density check matrix Randomly replaced with nonzero elements on the finite field GF(q).

[0045] The multi-ary low-density check matrix used in the embodiment of the present invention refers to a hexadecimal low-density check matrix, and q=16.

[0046] Step 2, generate codewords.

[0047] Perform Gaussian elimination on the multi-ary low-density check matrix to obtain a generator matrix, input the information sequence t...

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Abstract

The invention discloses a multi-system orthogonal signal low-density check code coding / decoding method, mainly aiming to solve the problems of weak anti-jamming capability, large number of decoding iteration times, great operand and poor decoding performance in the prior art. The method comprises the following specific implementation steps: (1) generating a multi-system low-density check matrix; (2) generating a code word; (3) performing orthogonal signal modulation; (4) receiving a message from a variable message processing device; (5) receiving an estimated code word; (6) judging whether a check equation is satisfied or not; (7) judging whether a maximum iteration time is reached or not; (8) ending decoding. In the orthogonal signal modulation, very high bit error rate performance can be achieved through less decoding iteration times, and the anti-jamming capability and frequency spectrum utilization ratio of the entire system are increased. By adopting fast Hadamard transform, the operation efficiency and storage efficiency of a decoding algorithm are increased, and the programming complexity of the decoding algorithm on a programmable device is lowered.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to an error control coding, digital modulation and demodulation and soft decision decoding method in a communication system. The method is a method of encoding and decoding by combining multi-ary system orthogonal signal modulation and low-density check code. It can be used in the technical fields of deep space communication, satellite communication, and ultra-wideband communication, and can realize reliable communication with high transmission rate and low bit error rate. Background technique [0002] At present, in domestic and foreign communication systems, Turbo codes and LDPC codes are error control codes close to Shannon tolerance, which can improve system reliability and spectrum efficiency. [0003] The patented technology "Coding and Modulation Method Based on Full Response CPM and Turbo Product Code" (authorized announcement number: CN102223204B, patent applic...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor 王勇超方娟闫辉
Owner XIDIAN UNIV
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