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Encoder and encoding method for Quasic-low-density parity-check (QC-LDPC) codes in digital television terrestrial multimedia broadcasting (DTMB) system

An encoder and coding technology, applied in error detection coding, transmission system, digital transmission system using multi-bit parity bits, etc., can solve the problems of transmission signal interference, digital signal error, etc.

Inactive Publication Date: 2011-07-13
COMMUNICATION UNIVERSITY OF CHINA +2
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Problems solved by technology

[0002] Since various distortions and noises in the transmission channel will interfere with the transmitted signal, it is inevitable that the digital signal will generate bit errors at the receiving end.

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  • Encoder and encoding method for Quasic-low-density parity-check (QC-LDPC) codes in digital television terrestrial multimedia broadcasting (DTMB) system
  • Encoder and encoding method for Quasic-low-density parity-check (QC-LDPC) codes in digital television terrestrial multimedia broadcasting (DTMB) system
  • Encoder and encoding method for Quasic-low-density parity-check (QC-LDPC) codes in digital television terrestrial multimedia broadcasting (DTMB) system

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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 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 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 first column). The row and column weights of ...

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Abstract

The invention relates to an encoding solution to three quasic-low-density parity-check (QC-LDPC) codes with different code rates in a digital television terrestrial multimedia broadcasting (DTMB) system. The encoding solution is characterized in that an encoder for the QC-LDPC codes in the system mainly comprises six parts, including a task scheduling module, a barrel shift accumulation circuit, a linear feedback shift register circuit, a convolution sum circuit, a modified shift register and accumulation circuit and an rearrangement splicing circuit.

Description

technical field [0001] The invention relates to digital terrestrial television broadcasting (Digital Television Terrestrial Multimedia Broadcasting, DTMB) technology, in particular to an efficient implementation method of a QC-LDPC coder in the 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 close to the Shannon limit and high-speed parallel decoding. The quasi-cyclic LDPC code (Quasic-LDPC, QC-LDPC) code is a special LDPC code, its encoding can adopt the Shift-Register-Adder-Accumulator (SRAA) method, and the decoding can be partially imple...

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Application Information

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IPC IPC(8): H03M13/11H04L1/00
Inventor 张鹏刘昌银万欣周德扬陈晋伦
Owner COMMUNICATION UNIVERSITY OF CHINA
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