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arXiv 1401.3753cs.ITmath.IT
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基于LLR的极化码连续消去列表译码

LLR-based Successive Cancellation List Decoding of Polar Codes

Alexios Balatsoukas-Stimming, Mani Bastani Parizi, Andreas Burg

摘要:

我们表明,连续取消列表解码可以制定专门使用对数似然比。除了数值稳定性之外,基于对数似然比的公式具有有用的性质,其简化了在连续消除列表解码中涉及的排序步骤。我们提出了一个硬件架构的连续取消列表解码器在对数似然比域,相比于对数似然域的实现,需要较少的不规则和较小的内存。这种简化与度量分类器中的增益一起,导致$56\%$到$137\%$比其他最近提出的架构更高的每单位面积吞吐量。然后,我们评估的CRC辅助连续消除列表解码器在不同的列表大小使用不同的CRC的经验性能,并得出结论,重要的是要适应CRC长度的列表大小,以实现级联极化码的最佳错误率性能。最后,我们合成传统的连续取消解码器在大块长度与我们提出的CRC辅助连续取消列表解码器相同的块错误概率,以证明,虽然我们的解码器具有略低的吞吐量和较大的面积,他们有一个显着较小的解码延迟。

英文摘要:

We show that successive cancellation list decoding can be formulated exclusively using log-likelihood ratios. In addition to numerical stability, the log-likelihood ratio based formulation has useful properties which simplify the sorting step involved in successive cancellation list decoding. We propose a hardware architecture of the successive cancellation list decoder in the log-likelihood ratio domain which, compared to a log-likelihood domain implementation, requires less irregular and smaller memories. This simplification together with the gains in the metric sorter, lead to $56\%$ to $137\%$ higher throughput per unit area than other recently proposed architectures. We then evaluate the empirical performance of the CRC-aided successive cancellation list decoder at different list sizes using different CRCs and conclude that it is important to adapt the CRC length to the list size in order to achieve the best error-rate performance of concatenated polar codes. Finally, we synthesize conventional successive cancellation decoders at large block-lengths with the same block-error probability as our proposed CRC-aided successive cancellation list decoders to demonstrate that, while our decoders have slightly lower throughput and larger area, they have a significantly smaller decoding latency.

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