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LDPC (Low-Density Parity-Check) encoder and encoding method based on parallel filtering in CMMB (China Mobile Multimedia Broadcasting)

An encoder and bit rate technology, applied in the field of mobile multimedia broadcasting, can solve the problems of long encoding time and increase equipment cost, and achieve the effect of improving encoding speed, reducing hardware cost and power consumption, and reducing logic resource requirements.

Inactive Publication Date: 2015-03-25
COMMUNICATION UNIVERSITY OF CHINA
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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

Method used

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  • LDPC (Low-Density Parity-Check) encoder and encoding method based on parallel filtering in CMMB (China Mobile Multimedia Broadcasting)
  • LDPC (Low-Density Parity-Check) encoder and encoding method based on parallel filtering in CMMB (China Mobile Multimedia Broadcasting)
  • LDPC (Low-Density Parity-Check) encoder and encoding method based on parallel filtering in CMMB (China Mobile Multimedia Broadcasting)

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Embodiment Construction

[0025] 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.

[0026] QC-LDPC code is a special kind of LDPC code, its generator matrix G QC and check matrix H QC Both are arrays composed of cyclic matrices and 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 matr...

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Abstract

The invention relates to a scheme for realizing the encoding of QC-LDPC (Quasi-Cyclic Low-Density Parity-Check) codes with 2 kinds of different code rates in a CMMB (China Mobile Multimedia Broadcasting) system. The invention is characterized in that an encoder of the QC-LDPC codes in the system mainly comprises shared registers, a parallel filter, a cycle right shifter and a parallel cycle left shift accumulator (parallel CLSA), and the core technology is parallel filtering. The parallel filter, the cycle right shifter and the parallel CLSA share 41 b-bit registers. The QC-LDPC encoder provided by the invention does not require memory, is compatible with multiple code rates, can effectively reduce the resource demand under the condition of obviously increasing 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 mobile multimedia broadcasting, in particular to an efficient implementation method of a QC-LDPC code encoder in a CMMB 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 QC to encode. The generator matrix G of QC-LDPC code QC It is composed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M13/11
Inventor 陈晋伦刘晋杨霏
Owner COMMUNICATION UNIVERSITY OF CHINA
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