Title: Coding-decoding method and device
Application Number: 200610109374 Application Date: 2006.08.14
Publication Number: 1937470 Publication Date: 2007.03.28
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H04L1/00;H03M13/00;H03M13/11
Applicant(s) Name: Huawei Technology Co., Ltd. Address:
Inventor(s) Name:
Attorney & Agent: lijuan
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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