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Cascade error-correcting coder

A technology of error correction coding and encoder, which is applied in the field of cascaded error correction encoders and their error correction coding, and can solve the problems of not being able to directly provide inner code decoding input C2 soft information, not including, and the algorithm does not converge.

Inactive Publication Date: 2004-05-26
TSINGHUA UNIV
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Problems solved by technology

[0017] Therefore, the information about the symbol x output by the outer code decoding cannot directly provide information about the input C of the inner code decoding. 2 soft information;
[0018] 2) Simple feedback will inevitably introduce positive feedback, so that the algorithm does not converge or converges far away from the correct solution
As for the second question, it is required that the feedback soft information used in the second inner code decoding does not include the information used in the last decoding of the same code

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Embodiment Construction

[0096] Combine below Figure 3 to Figure 8 Several embodiments of concatenated error correction coding according to the present invention are described.

[0097] image 3 The first embodiment of the cascaded error correction encoder according to the present invention is shown, wherein QPSK is used as the modulation method, and 1 / 2 code rate convolutional code is used for the error correction code of the inner code.

[0098] The concatenated error correction coder according to this embodiment is characterized in that a 1 / 2 rate convolutional error correction code is used as the QPSK constellation symbol.

[0099] Specifically, the generator polynomial of the 1 / 2 code rate, 64-state convolutional code of the I symbol modulated by QPSK is

[0100] G1(x)=1+x+x 2 +x 3 +x 6

[0101] The generator polynomial of the 1 / 2 code rate, 64-state convolutional code of the Q symbol modulated by QPSK is

[0102] G2(x)=1+x 2 +x 3 +x 5 +x 6

[0103] The concatenated...

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Abstract

A cascading error correction coder and its coding method can be used in ground data multimedia television broadcast system. It takes the error correction coding planisphere and modulation mapping planisphere as a whole to be considered to finished the net lattice coding modulation and then to realize the coding and the mapping after coding according to certain format for greatly raising the system performance in its error correction and transmission. The said net lattice coding modulation pattern can be cecular QPSK, turbo cecullar QPSK, cecullar 16 QAM, turbo cecullar 16 QAM, cecullar 64 QAM, turbo cecullar 64 QAM and etc.

Description

[0001] This application is a divisional application of "Terrestrial Digital Multimedia Television Broadcasting System" with application number 00123597.4 filed on August 25, 2000. technical field [0002] The invention belongs to the technical field of digital information transmission error correction encoding, in particular to a cascaded error correction encoder and its encoding method, and more particularly to a cascaded error correction encoder and its error correction used in a terrestrial digital multimedia television broadcasting system encoding method. Background technique [0003] In a digital transmission system, no matter what type of medium the signal is transmitted through, due to signal attenuation, distortion and various interferences, errors will inevitably occur in the received data. For different information data types, the bit error rate requirements are different. Taking the predictive coding and transform coding of images as an example, if there is a bit...

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Application Information

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IPC IPC(8): H03M13/00H04N7/24H04N19/89
Inventor 杨林杨知行
Owner TSINGHUA UNIV
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