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arXiv 2107.05965cs.ITmath.IT
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极化码的高效置信传播列表有序统计译码

Efficient Belief Propagation List Ordered Statistics Decoding of Polar Codes

Yonatan Urman, Guy Mogilevsky, David Burshtein

摘要:

提出了用于在二进制擦除信道(BEC)或加性高斯白噪声信道(AWGNC)上传输的极化码(其可以是CRC增强的)的有效解码的新算法。首先提出了一种基于失活译码的BEC精确最大似然译码算法,并分析了该算法的计算复杂性。该算法在稀疏极化码奇偶检验矩阵上应用矩阵三角剖分过程,然后求解GF(2)上的小尺寸线性系统。然后,我们考虑通过AWGNC传输的极化码的有效解码。该算法采用CRC辅助的置信传播列表(CBPL)解码,然后进行低阶有序统计解码(OSD)。即使当OSD的再处理顺序低至1时,新的解码器被示出为显着改善平原CBPL。为了有效地实现OSD,我们从BEC的情况下,采用矩阵三角剖分算法。我们还指出如何解码算法可以并行实现低延迟解码。数值模拟被用来评估新算法的性能和计算复杂性。

英文摘要:

New algorithms for efficient decoding of polar codes (which may be CRC-augmented), transmitted over either a binary erasure channel (BEC) or an additive white Gaussian noise channel (AWGNC), are presented. We start by presenting a new efficient exact maximum likelihood decoding algorithm for the BEC based on inactivation decoding and analyze its computational complexity. This algorithm applies a matrix triangulation process on a sparse polar code parity check matrix, followed by solving a small size linear system over GF(2). We then consider efficient decoding of polar codes, transmitted over the AWGNC. The algorithm applies CRC-aided belief propagation list (CBPL) decoding, followed by ordered statistics decoding (OSD) of low order. Even when the reprocessing order of the OSD is as low as one, the new decoder is shown to significantly improve on plain CBPL. To implement the OSD efficiently, we adapt the matrix triangulation algorithm from the BEC case. We also indicate how the decoding algorithms can be implemented in parallel for low latency decoding. Numerical simulations are used to evaluate the performance and computational complexity of the new algorithms.

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