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arXiv 2203.13552cs.ITmath.IT
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论软信息在Quantization中的作用

On the Role of Quantization of Soft Information in GRAND

Peihong Yuan, Ken R. Duffy, Evan P. Gabhart, Muriel Médard

摘要:

在这项工作中,我们研究猜测随机加性噪声解码(GRAND)量化软输入。首先,我们分析了有序可靠性比特GRAND(ORBGRAND)的可达速率,它使用可靠性的秩顺序作为量化的软信息。我们表明,多线ORBGRAND可以接近任何信噪比(SNR)的能力。然后,我们引入离散软GRAND(DSGRAND),它使用的信息从一个传统的量化器。仿真结果表明,DSGRAND很好地近似最大似然(ML)解码的量化位数,这是符合当前的软解码实现。对于(128,106)CRC级联极化码,基本ORBGRAND能够匹配或优于具有64的码字列表大小和3比特量化软信息的CRC辅助连续消除列表(CA-SCL)解码,而DSGRAND优于具有128个码字的列表大小的CA-SCL解码。ORBGRAND和DSGRAND都表现出比CA-SCL低一个数量级的平均复杂度和低两个数量级的内存需求。

英文摘要:

In this work, we investigate guessing random additive noise decoding (GRAND) with quantized soft input. First, we analyze the achievable rate of ordered reliability bits GRAND (ORBGRAND), which uses the rank order of the reliability as quantized soft information. We show that multi-line ORBGRAND can approach capacity for any signal-to-noise ratio (SNR). We then introduce discretized soft GRAND (DSGRAND), which uses information from a conventional quantizer. Simulation results show that DSGRAND well approximates maximum-likelihood (ML) decoding with a number of quantization bits that is in line with current soft decoding implementations. For a (128,106) CRC-concatenated polar code, the basic ORBGRAND is able to match or outperform CRC-aided successive cancellation list (CA-SCL) decoding with codeword list size of 64 and 3 bits of quantized soft information, while DSGRAND outperforms CA-SCL decoding with a list size of 128 codewords. Both ORBGRAND and DSGRAND exhibit approximately an order of magnitude less average complexity and two orders of magnitude smaller memory requirements than CA-SCL.

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