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Parallel filtering based LDPC (low-density parity-check) encoder and encoding method in deep space communication

A deep space communication and encoder technology, applied in the field of high-efficiency implementation of QC-LDPC code encoders, can solve the problems of long encoding time and increased equipment costs, so as to improve encoding speed, reduce hardware cost and power consumption, and reduce resources effect of demand

Inactive Publication Date: 2015-05-20
苏州威士达信息科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

When implemented in hardware, such a large storage requirement increases equipment cost and takes longer to encode

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  • Parallel filtering based LDPC (low-density parity-check) encoder and encoding method in deep space communication
  • Parallel filtering based LDPC (low-density parity-check) encoder and encoding method in deep space communication
  • Parallel filtering based LDPC (low-density parity-check) encoder and encoding method in deep space communication

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0032] QC-LDPC code is a special kind of LDPC code. Its generator matrix G and check matrix H are both arrays composed of cyclic matrices, which have the characteristics of segmented cyclic, so they are called quasi-cyclic LDPC codes. From the perspective of rows, each row of the circulatory matrix is ​​the result of the previous row (the first row is the last row); from the perspective of columns, each column of the circulatory matrix is ​​the result of the previous column (the first row is the last row). column) the result of circularly shifting down one bit. The set of row vectors of a circulant matrix is ​​exactly the same as the set of column vectors. Therefore, a circulant matrix can be completely characterized by its first row or column. The row and column weights of a circular matrix ar...

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Abstract

The invention relates to a scheme for encoding nine QC-LDPC (quasi-cyclic-low-density parity-check) codes in a CCSDS (consultative committee for space data system) deep space communication system. The scheme is characterized in that a QC-LDPC code encoder of the system mainly comprises a shared register, a parallel filter and a serial cyclic left shift accumulator (CLSA); the core technology of the encoder is parallel filtering; and the parallel filter and the serial CLSA share t-numbered b-bit registers. The QC-LDPC encoder is compatible in multiple code rates, can effectively reduce the resource demands while obviously improving the encoding speed, and has the advantages of high encoding speed, low resource consumption, low power consumption, low cost and the like.

Description

technical field [0001] The invention relates to the field of deep space data communication, in particular to an efficient implementation method of a QC-LDPC code encoder in a CCSDS deep space communication system. Background technique [0002] Since various distortions and noises in the transmission channel will interfere with the transmitted signal, bit errors in the digital signal will inevitably occur at the receiving end. In order to reduce the bit error rate, channel coding technology needs to be adopted. [0003] Low-Density Parity-Check (Low-Density Parity-Check, LDPC) codes have become a research hotspot in the field of channel coding because of their excellent performance of approaching the Shannon limit. The quasi-cyclic LDPC code (Quasic-LDPC, QC-LDPC) code is a special LDPC code, and its coding can be realized by using a Shift-Register-Adder-Accumulator (SRAA). [0004] The SRAA method uses the generator matrix G for encoding. The generator matrix G of the QC-...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M13/11
Inventor 张鹏蔡超时杨刚
Owner 苏州威士达信息科技有限公司