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arXiv 1209.4444cs.ITmath.IT
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关于极化码的构造

On the Construction of Polar Codes

Ramtin Pedarsani, S. Hamed Hassani, Ido Tal, Emre Telatar

摘要:

我们考虑在二进制无记忆对称(BMS)信道上有效构造极化码的问题。经由极化信道的精确评估来设计极化码以找出哪些极化信道是“好的”的复杂度在块长度上似乎是指数的。在\cite{TV11}中,Tal和Vardy表明,如果近似地执行评估,则构造只有线性复杂度。在本文中,我们遵循这种方法,并提出了一个框架,\cite{TV11}和新的相关算法的算法可以分析的复杂性和准确性。我们提供的数值和分析结果,这样的算法的效率,特别是我们可以找到所有的“好”的通道(除了消失的分数),几乎线性复杂的块长度(除了一个polylogarithmic因子)。

英文摘要:

We consider the problem of efficiently constructing polar codes over binary memoryless symmetric (BMS) channels. The complexity of designing polar codes via an exact evaluation of the polarized channels to find which ones are "good" appears to be exponential in the block length. In \cite{TV11}, Tal and Vardy show that if instead the evaluation if performed approximately, the construction has only linear complexity. In this paper, we follow this approach and present a framework where the algorithms of \cite{TV11} and new related algorithms can be analyzed for complexity and accuracy. We provide numerical and analytical results on the efficiency of such algorithms, in particular we show that one can find all the "good" channels (except a vanishing fraction) with almost linear complexity in block-length (except a polylogarithmic factor).

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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