Coding-decoding method and device

A decoding and encoding technology, applied in the field of decoding methods and devices, can solve problems such as the inability to reduce encoding performance, achieve the effects of suppressing encoding performance loss, reducing retransmission times, and improving encoding gain
CN100508442CActive Publication Date: 2009-07-01HUAWEI TECH CO LTD +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
HUAWEI TECH CO LTD
Publication Date
2009-07-01

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Abstract

The existed coding / decoding method with low density odd-even check code cannot reduce the small circulation existing in the checking matrix. The said small circulation depresses the coding feature. The technical scheme of the invention finds out the weak bit in the related signal original bit group in the given check matrix. When the coding end groups the signal source bits to be set, the scheme obtains corresponding code words after inserting appointing bit info promised by both sending and receiving ends into weak bit of each group. According to the appointed bit info, the decode end initializes the probability info related to the weak bit node into a value close to infinity. Thus the scheme raises the accuracy of probability info transferred between the bit node and the checking node during the iterative progress. The invention also corrects the error info of adjacent nodes. These raises decoding feature and obtains an obvious coding gain.
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Description

technical field

[0001] The present invention relates to encoding and decoding technology, in particular to an encoding method and device, decoding method and device based on low-density parity-check codes. Background technique

[0002] Channel coding technology is an indispensable key technology for mobile communication systems, and LDPC (Low Density Parity Code, Low Density Parity Check Code) code in channel coding technology is generally considered to be superior to previous channel coding methods. performance, and has been applied in the research of the fourth generation mobile communication system, LDPC codes can be characterized by generator matrix and parity check matrix.

[0003] For low-density parity-check codes based on iterative decoding algorithms, a crucial factor affecting its coding performance is the size of the minimum cycle (cycle) in the check matrix, that is, the size of the check matrix corresponding to the Tanner diagram. The perimeter (girth) of the s...

Claims

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