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arXiv cs/0602020cs.ITmath.IT
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块间置换Turbo码

Inter-Block Permuted Turbo Codes

Yan-Xiu Zheng, Yu T. Su

摘要:

Turbo码中交织器的结构和大小对分量译码器的信息输入和软输出的距离谱和协方差特性有重要影响。本文介绍了一类新的交织器,块间置换(IBP)交织器,可以建立在任何现有的“好”的块式交织器通过简单地添加一个IBP阶段。IBP交织器降低了上述相关性并增加了有效交织大小。增加的有效交织尺寸改善了距离谱,而减小的协方差增强了迭代解码器的性能。此外,IBP(交织)Turbo码(IBPTC)的结构自然适合于需要并行解码的高速率应用。我们提出了一些有用的界限和约束与IBPTC,可用作设计准则。推导出权重为2和权重为4的输入序列的相应码字权重上界。基于一些设计准则,我们提出了一个简单的IBP算法,并表明,相关的IBPTC产生0.3至1.2 dB的性能增益,或等效地,一个IBPTC呈现相同的性能,大大减少交织延迟。EXIT和协方差行为提供了另一个数值证明的IBPTC的优越性。

英文摘要:

The structure and size of the interleaver used in a turbo code critically affect the distance spectrum and the covariance property of a component decoder's information input and soft output. This paper introduces a new class of interleavers, the inter-block permutation (IBP) interleavers, that can be build on any existing "good" block-wise interleaver by simply adding an IBP stage. The IBP interleavers reduce the above-mentioned correlation and increase the effective interleaving size. The increased effective interleaving size improves the distance spectrum while the reduced covariance enhances the iterative decoder's performance. Moreover, the structure of the IBP(-interleaved) turbo codes (IBPTC) is naturally fit for high rate applications that necessitate parallel decoding. We present some useful bounds and constraints associated with the IBPTC that can be used as design guidelines. The corresponding codeword weight upper bounds for weight-2 and weight-4 input sequences are derived. Based on some of the design guidelines, we propose a simple IBP algorithm and show that the associated IBPTC yields 0.3 to 1.2 dB performance gain, or equivalently, an IBPTC renders the same performance with a much reduced interleaving delay. The EXIT and covariance behaviors provide another numerical proof of the superiority of the proposed IBPTC.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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