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Highly parallel qc-ldpc encoder and encoding method in cmmb

An encoder and high-level technology, applied in the application of multi-bit parity error detection coding, error correction/detection using block codes, data representation error detection/correction, etc., can solve high equipment cost and high power consumption , multi-logic resources and other issues to achieve the effect of reducing resource requirements, hardware costs and power consumption

Inactive Publication Date: 2015-09-02
RONGCHENG DINGTONG ELECTRONICS INFORMATION SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When implemented by FPGA, more logic resources are required, which will inevitably result in high equipment cost and high power consumption

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  • Highly parallel qc-ldpc encoder and encoding method in cmmb
  • Highly parallel qc-ldpc encoder and encoding method in cmmb
  • Highly parallel qc-ldpc encoder and encoding method in cmmb

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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 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 point of view of rows, each row of the circulatory matrix is ​​the result of a cyclic right shift of the previous row (the first row is the last row); from the perspective of columns, each column of the circulatory matrix is ​​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 QC-LDPC...

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Abstract

The invention relates to a scheme for realizing highly parallel encoding of two types of QC-LDPC (Quasic-Low Density Parity Check) codes with different code rates in a CMMB (China Mobile Multimedia Broadcasting) system. The scheme is characterized in that a highly parallel encoder of the DC-LDPC codes in the system is mainly composed of four parts, including a register, a lookup table, a bc bit two-input exclusive OR gate and a b bit two-input exclusive OR gate. The QC-LDPC highly parallel encoder provided by the invention is compatible to multiple code rates, can make full use of the lookup table function in a FPGA (Field Programmable Gate Array) logical resource, effectively reduces the resource needs under the condition of keeping constant encoding speed, and has the advantages of being simple in resource control, low in resource consumption, low in power consumption and low in cost, and the like.

Description

technical field [0001] The invention relates to the field of mobile multimedia broadcasting, in particular to a highly parallel realization 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 (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 of a×t b×b order circul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M13/11
Inventor 刘志文
Owner RONGCHENG DINGTONG ELECTRONICS INFORMATION SCI & TECH CO LTD