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Coding, decoding method and encoder, decoder

A coding method and coding technology, which are applied in the field of channel coding, can solve problems such as mobile channel interference, high coding gain, and long burst errors, and achieve the effect of improving anti-error capability and high coding gain

Active Publication Date: 2008-03-12
HUAWEI TECH CO LTD
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  • Description
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Problems solved by technology

[0004] During the research and practice of the prior art, the inventor found that the prior art has the following problems: due to the multipath effect and the Doppler effect, the mobile channel has serious interference and has the characteristics of long burst error, even after CRC-32 encoding, the forward error correction code adopts RS (255, 191) and can only correct up to 64 error bytes; when there are more than 64 error bytes in the codeword, the error datagram will not be recovered, so RS is used The coding gain of forward error correction coding is not too high

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Embodiment Construction

[0018] The embodiment of the present invention provides a forward error correction coding method based on Low Density Parity Check (LDPC, Low Density ParityCheck), which replaces the RS (255, 191) coding in the DVB-H standard, and can obtain higher coding gain and Adapt to more demanding channel environment.

[0019] LDPC code is a linear block code whose parity check matrix is ​​a sparse matrix. Its performance is close to the Shannon limit, and it has the characteristics of controllable coding complexity and simple and fast decoding. Under the same bit error rate, higher coding gain can be obtained by using LDPC code as forward error correction coding compared with RS code.

[0020] The embodiment of the present invention provides a forward error correction coding method based on LDPC (2040, 1528). Among them, "1528" is the bit length of the input information, "2040" is the bit length of the encoded codeword, and the check bit length is 2040-1528=512. LDPC (2040, 1528) is ...

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Abstract

The invention discloses a coding method that consists of: obtaining input information; filling information is arranged at the tail of the input information; encode the input information that is provided with filling information according to the matrix generated by the LDPC code so as to obtain corresponding code word. The invention also provides a decoding method. Correspondingly, the invention provides an encoder and a decoder. The invention can obtain higher coding benefits, improve the anti error code capacity of the system.

Description

technical field [0001] The invention relates to the technical field of channel coding, in particular to a low density check code (LDPC code) encoding and decoding method, an encoder and a decoder. Background technique [0002] DVB-H (Digital Video Broadcasting Handled) is a transmission standard developed by the European Digital Television Standards Organization to provide multimedia services to portable and handheld terminals through terrestrial digital broadcasting networks. ) of the extended application on the mobile terminal. In the current DVB-H standard, a Reed-Solomon RS code (Reed-Solomon) code is used for encoding. According to the DVB-H standard, the IP datagram will be filled into a matrix with a fixed number of 255 columns and a variable number of rows (1024, 512 or 256) in the IP encapsulator, and pre-preceded using RS(255, 191) error correction coding. Among them, "191" is the length of the input information bit, "255" is the length of the code word after en...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/11
CPCH03M13/6393H03M13/6356H03M13/1102
Inventor 郑平方刘荣科戚达平
Owner HUAWEI TECH CO LTD
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