Systematical interpretation method of Reed-Solomon code cascade feedback systematic convolution code

A feedback system and convolutional code technology, applied in the decoding field of channel error correction coding, can solve the problems of insufficient use of soft information and large amount of calculation, and achieve the effect of increasing the amount of effective information, improving performance, and saving the amount of calculation.

Inactive Publication Date: 2008-11-19
SOUTHEAST UNIV
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Problems solved by technology

[0004] Technical problem: the purpose of this invention is to provide a kind of decoding method (based on Chase-2 type RS decoding method) of the system of Reed-Solomon code concatenated feedback system convolutional code, improve the form of its

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  • Systematical interpretation method of Reed-Solomon code cascade feedback systematic convolution code
  • Systematical interpretation method of Reed-Solomon code cascade feedback systematic convolution code
  • Systematical interpretation method of Reed-Solomon code cascade feedback systematic convolution code

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[0048]The semi-soft-decision iterative decoding method of cascaded BCJR and simplified Chase-2 type RS decoding algorithm is characterized in that: first, the convolutional code decoder performs soft-decision decoding to the inner code of the concatenated code; subsequently, The RS code decoder performs the following processing on the deinterleaved APP L value delivered by the convolutional code decoder: (1) reverse the APP L value whose absolute value is within a certain range (if this iteration is the last large iteration , and the previous large iteration did not correct all the errors), then perform BPSK demodulation after hard judgment of the sequence of APP L values; (2) sort the APP L values ​​according to reliability, and get the most unreliable ones ( Generally, it is 2) bits, add an error pattern to these bits each time for decoding, once the decoding result can pass the verification, it is considered that the code word is the correct decoding result, and then convert...

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Abstract

In the decoding method in a convolutional code system of a Reed-Solomon code concatenation and feedback system, the concatenated code is composed of an external code and an inner code. For this code structure, at least one big iterative decoding is performed in the decoding method; and in each big iterative decoding, the inner code is decoded first, then the decoding code of each external code decoder is obtained after the software output of the inner decoder is passed through a deinterleaver and a software information processor. The invention uses simplified criterion to select the output code of RS code, thereby reduces the number of error pattern of chase-2 algorithm; The RS code decoder not only provides prior probability information of a information sequence to RSC code decoder, but also modifies the symbol of the information sequence at the same time, thereby increases the effectiveness of information transfer between the inner decoder and the external decoder.

Description

technical field [0001] The invention is a semi-soft decision iterative decoding method of an improved RS code concatenated convolutional code system, and belongs to the technical field of channel error correction coding decoding. Background technique [0002] The RS code concatenated convolutional code system has been widely used in the field of deep space communication, and is adopted in the latest IEEE 802.16 protocol. For this cascaded system, cascaded BCJR (or SOVA) and Chase-2 type RS decoding algorithm for semi-soft decision iterative decoding has good performance, compared with hard decision iterative decoding algorithm, it has a comparative performance This is due to the mutual transmission of soft information between the decoders of the inner code and the outer code, and each decoder itself is also soft-decision or semi-soft-decision decoding. However, although the performance of the Chase-2 decoding algorithm of the RS code increases with the increase of the dimen...

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Application Information

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IPC IPC(8): H03M13/15H03M13/23H03M13/27
Inventor 赵春明刘晓健孙小钧
Owner SOUTHEAST UNIV
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