Check-Irregular LDPC Codes for Unequal Error Protection under Iterative Decoding
Check-Irregular LDPC Codes for Unequal Error Protection under Iterative Decoding
复制标题
迭代译码下不等差错保护的校验不规则LDPC码
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
D. Declercq
中科院分区：
文献类型：
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作者：
L. Sassatelli;W. Henkel;D. Declercq
在LDPC码的许多优化技术中，通常认为校验节点的不规则性是固定的，因为为了最大化码的整体收敛速度，轮廓只需包含两个连续的阶数。在本文中，我们证明了在校验节点侧构造两个以上不同次数的比特正则码是可能的，以加速码字的某些部分的收敛，即使我们可能略微降低全局收敛。然后，利用校验不规则性构造了不等差错保护(UEP)码，并给出了一种非常灵活的实现方法。该方法基于修剪母码，从而创建具有不同UEP属性的不同子码，但使用相同的解码器进行解码。
In many optimization techniques of LDPC codes, the check node irregularity is usually considered as being fixed because the profile must contain only two consecutive degrees in order to maximize the overall convergence speed of the code. We show in this paper that it is possible to construct bit-regular codes with more than two different degrees at check nodes side to speed up the convergence of some parts of the codeword, even if we may decrease a little the global convergence. Then, we take advantage of the check irregularity to create unequal error protection (UEP) codes, and present a very flexible method to achieve it. This method is based on pruning a mother code, thereby creating different subcodes with different UEP properties, but decoded with the same decoder.