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arXiv 1902.01922cs.ITmath.IT
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多核极化码的快速译码

Fast Decoding of Multi-Kernel Polar Codes

Adam Cavatassi, Thibaud Tonnellier, Warren J. Gross

摘要:

极化码是一类线性纠错码,其可证明地获得具有无限码字长度的信道容量。有限长度极化码已经被采用到用于新无线电的第五代3GPP标准中,尽管它们的原生长度被限制为2的幂。利用多个极化矩阵以更复杂的解码过程为代价增加了极化码的长度灵活性。连续消除(SC)是标准极化解码器,并且由于其顺序性质而具有时间复杂度$\mathcal{O}(N \log N)$。然而,冻结集合中的一些模式反映了具有低延迟解码器的简单线性码,这允许通过修剪解码调度来显著减少SC延迟。这种快速解码技术以前仅用于传统的Arikan极化码,导致多内核极化码成为不切实际的长度兼容技术,没有可用的快速解码器。我们提出了快速简化的连续抵消解码节点模式,这是兼容的极化码构造的Arikan和三进制内核,和推广技术。我们概述了高效的实现,可能通过对三元节点参数施加约束。我们表明,在码字长度为(96,432,768,2304)的所有情况下,与SC解码器相比,多核极化码的快速解码至少减少了72%的延迟。

英文摘要:

Polar codes are a class of linear error correction codes which provably attain channel capacity with infinite codeword lengths. Finite length polar codes have been adopted into the 5th Generation 3GPP standard for New Radio, though their native length is limited to powers of 2. Utilizing multiple polarizing matrices increases the length flexibility of polar codes at the expense of a more complicated decoding process. Successive cancellation (SC) is the standard polar decoder and has time complexity $\mathcal{O}(N \log N)$ due to its sequential nature. However, some patterns in the frozen set mirror simple linear codes with low latency decoders, which allows for a significant reduction in SC latency by pruning the decoding schedule. Such fast decoding techniques have only previously been used for traditional Arikan polar codes, causing multi-kernel polar codes to be an impractical length-compatibility technique with no fast decoders available. We propose fast simplified successive cancellation decoding node patterns, which are compatible with polar codes constructed with both the Arikan and ternary kernels, and generalization techniques. We outline efficient implementations, made possible by imposing constraints on ternary node parameters. We show that fast decoding of multi-kernel polar codes has at least 72% reduced latency compared with an SC decoder in all cases considered where codeword lengths are (96, 432, 768, 2304).

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