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LDPC (Low Density Parity Check) encoder and encoding method based on summation array in deep space communication

A deep space communication and encoder technology, applied in the field of parallel implementation of QC-LDPC code encoders, can solve the problems of high power consumption and high equipment cost, and achieve the effect of reducing hardware cost and power consumption, and reducing resource requirements

Inactive Publication Date: 2013-01-02
刘志文
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Problems solved by technology

When implemented by hardware, more memory and registers are required, which will inevitably lead to high equipment cost and high power consumption

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  • LDPC (Low Density Parity Check) encoder and encoding method based on summation array in deep space communication
  • LDPC (Low Density Parity Check) encoder and encoding method based on summation array in deep space communication
  • LDPC (Low Density Parity Check) encoder and encoding method based on summation array in deep space communication

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Embodiment Construction

[0017] 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.

[0018] 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 generator matrix G of the QC-LDPC code is comp...

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Abstract

The invention relates to a scheme of solving parallel encoding of nine QC-LDPC (Quasi-Cyclic-Low Density Parity Check) codes in a CCSDS (Consultative Committee for Space Data Systems) deep space communication system, which is characterized in that a parallel encoder of the QC-LDPC codes in the system is mainly composed of four parts of a register, a summation array, a selecting expander and a b-digit 2-input exclusive-or gate. The QC-LDPC parallel encoder provided by the invention is compatible with a multi-code rate, and resource requirements can be effectively reduced in the condition that the encoding speed is kept unchanged. The QC-LDPC parallel encoder has the advantages of simple control, less resource consumption, little 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 a parallel 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-LD...

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Application Information

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IPC IPC(8): H03M13/11
Inventor 张鹏蔡超时刘昌银
Owner 刘志文
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