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arXiv 1302.5153cs.ITmath.IT
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利用迭代比特信道升级构造极化码

Constructing Polar Codes Using Iterative Bit-Channel Upgrading

Arash Ghayoori, T. Aaron Gulliver

摘要:

Arikan给出的极化码的定义是明确的,但构造复杂性是一个问题。这是由于随着码字长度增加,比特信道的输出字母表的大小呈指数增长。Tal和Vardy最近提出了一种用于构建控制这种增长的极化码的方法。他们用一个更好的通道和一个更差的通道来近似每个比特通道,同时减小了字母表的大小。他们基于较差的信道构建了极化码,并使用较好的信道来测量与最佳信道的距离。本文认为,从更好的渠道的角度获得的知识。提出了一种利用比特通道的迭代升级的方法,该方法连续地产生更接近原始通道的通道。结果表明,这种方法可以用来获得一个信道任意接近原始信道,因此极化码的最佳结构。

英文摘要:

The definition of polar codes given by Arikan is explicit, but the construction complexity is an issue. This is due to the exponential growth in the size of the output alphabet of the bit-channels as the codeword length increases. Tal and Vardy recently presented a method for constructing polar codes which controls this growth. They approximated each bit-channel with a better channel and a worse channel while reducing the alphabet size. They constructed a polar code based on the worse channel and used the better channel to measure the distance from the optimal channel. This paper considers the knowledge gained from the perspective of the better channel. A method is presented using iterative upgrading of the bit-channels which successively results in a channel closer to the original one. It is shown that this approach can be used to obtain a channel arbitrarily close to the original channel, and therefore to the optimal construction of a polar code.

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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