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QC-LDPC codes and system and method applied thereof

A technology of a transmitting system and a receiving system, applied in the field of digital broadcasting, can solve the problems of lack of structural characteristics, complex coding, consumption of large storage units, etc., achieving good error correction performance, simple system structure, and improving the effect of mobile receiving functions.

Inactive Publication Date: 2010-06-23
ACAD OF BROADCASTING SCI SARFT
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Problems solved by technology

[0003] LDPC codes have a sparse parity check structure, so it is easy to realize parallel decoding, but generally speaking, the coding matrix of LDPC codes is not sparse, especially the random LDPC codes searched by computers, due to the lack of sufficient structural characteristics, the coding is complex and consumes a lot of memory

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  • QC-LDPC codes and system and method applied thereof
  • QC-LDPC codes and system and method applied thereof
  • QC-LDPC codes and system and method applied thereof

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Embodiment Construction

[0030] Below, refer to the attached Figure 1~3 The system and method for applying the QC-LDPC code family and the code family of the present invention are described in detail.

[0031] Inspired by irregular LDPC codes, Hui Jin proposed irregular repeat accumulation (IRA) codes in 2001, and proved that binary IRA codes can achieve the same superior performance as irregular LDPC codes, but the complexity of the encoding algorithm is far lower in LDPC codes. See Jin Hui, Khandekar A, McEliece R. Irregular repeat-accumulate codes [C]. In Proc. 2nd International Symposium on Turbo Codes and Related Topics, Brest, France, 2000, 9: 1-8. IRA codes can be encoded by the serial connection of two member codes like turbo codes; like LDPC codes, they can be decoded using the sum-product decoding algorithm on the Tanner graph, so IRA codes not only have the low coding complexity of turbo codes A bit, also has the advantage of strong decoding ability of LDPC code and high parallelism.

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Abstract

The invention provides QC-LDPC codes and a system and a method applied thereof. The system comprises a transmitting system and a receiving system. The transmitting system conducts quasi-cycle low-density parity check (QC-LDPC) matrix coding to input information, orthogonal frequency division multiplexing modulation is conducted to the QC-LDPC coded information and modulating signals are transmitted through a transmitter. The receiving system receives signals transmitted by the transmitting system, demodulation is conducted to orthogonal frequency division multiplexing signals first and then QC-LDPC matrix decoding is conducted to obtain the transmitted information data. The invention has the advantages that the structure of the system is simple, the error code correction performance is high, the system can adapt to the high-speed data transmission technology in the multi-path environment and frequency selectivity fading channel and the mobile receiving function is improved.

Description

technical field [0001] The invention relates to the technical field of digital broadcasting, in particular to a system and method for applying the QC-LDPC code family and the code family. Background technique [0002] The Low Density Parity Check (LDPC) code was first proposed by Gallager in 1962, and it has been proved to be a coding method that can approach the Shannon limit well under Gaussian White Noise (AWGN), so received widespread attention. The excellent performance of LDPC codes is not only a research hotspot in academia, but also widely used in industry. At present, LDPC codes are used in some standards, such as DVB-S2, IEEE802.16e, and China's digital TV terrestrial broadcasting, digital TV satellite broadcasting, and mobile multimedia broadcasting standards. [0003] LDPC codes have a sparse parity check structure, so it is easy to realize parallel decoding, but generally speaking, the coding matrix of LDPC codes is not sparse, especially the random LDPC codes...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L27/26
Inventor 李继龙杨明李锦文高鹏吴智勇盛国芳邸娜
Owner ACAD OF BROADCASTING SCI SARFT
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