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Low density parity check (LDPC) serial encoder in digital terrestrial multimedia broadcasting (DTMB) and based on lookup table and coding method

A technology of serial encoder and lookup table, which is applied to the application of multi-bit parity error detection coding, data representation error detection/correction, error correction/detection using block codes, etc., which can solve the problem of high equipment cost, Problems such as high power consumption, to achieve the effect of reducing hardware cost and power consumption, and reducing resource requirements

Inactive Publication Date: 2013-01-16
苏州威士达信息科技有限公司
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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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  • Low density parity check (LDPC) serial encoder in digital terrestrial multimedia broadcasting (DTMB) and based on lookup table and coding method
  • Low density parity check (LDPC) serial encoder in digital terrestrial multimedia broadcasting (DTMB) and based on lookup table and coding method
  • Low density parity check (LDPC) serial encoder in digital terrestrial multimedia broadcasting (DTMB) and based on lookup table and coding method

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Embodiment Construction

[0015] 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.

[0016] 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 solving a problem of serial coding of quality control-low density parity check (QC-LDPC) in different code rates in a digital terrestrial multimedia broadcasting (DTMB) system. An LDPC serial encoder is characterized in that a serial encoder of QC-LDPC codes of the system is mainly composed of four components including a register, an indexing encoder, a lookup table and a b-bit dual-input exclusive-or gate. The QC-LDPC serial encoder can be compatible to multiple code rates, can effectively reduce resource demands on condition of keeping coding rate to be unchanged, and has advantages of being simple in control, less in resource consumption, small in consumption, low in cost and the like.

Description

technical field [0001] The invention relates to the field of digital terrestrial television broadcasting, in particular to a serial realization method of a QC-LDPC code encoder in a DTMB 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). At present, QC-LDPC codes have been widely used in standards such as IEEE802.11n, 802.16e and China's digital terrestria...

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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 苏州威士达信息科技有限公司
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