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Lookup table based LDPC (low-density parity-check) serial encoder and encoding method in near-earth communication

A serial encoder and near-earth communication technology, which is applied in the field of near-earth space data communication, 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: 2013-01-09
苏州威士达信息科技有限公司 +1
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  • Abstract
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  • Application Information

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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

Method used

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  • Lookup table based LDPC (low-density parity-check) serial encoder and encoding method in near-earth communication
  • Lookup table based LDPC (low-density parity-check) serial encoder and encoding method in near-earth communication
  • Lookup table based LDPC (low-density parity-check) serial encoder and encoding method in near-earth communication

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Embodiment Construction

[0014] 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.

[0015] 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 for serially encoding QC-LDPC (quasi-cyclic-low-density parity-check) codes in a CCSDS (consultative committee for space data system) near-earth communication system. The scheme is characterized in that a QC-LDPC code serial encoder of the system mainly comprises a register, a lookup table and a b-bit two-input exclusive-OR gate. The QC-LDPC serial encoder can effectively reduce the resource demands under the condition of keeping the encoding speed unchanged, and has the advantages of simplicity in control, low resource consumption, low power consumption, low cost and the like.

Description

technical field [0001] The invention relates to the field of near-earth space data communication, in particular to a serial implementation method of a QC-LDPC code encoder in a CCSDS near-earth 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 Q...

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Application Information

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IPC IPC(8): H04L1/00
Inventor 张鹏蔡超时周德扬
Owner 苏州威士达信息科技有限公司