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arXiv 2501.12971cs.ITmath.IT
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通过噪声猜测在有限状态加性信道上的通用译码

Universal Decoding over Finite-State Additive Channels via Noise Guessing

Henrique K. Miyamoto, Sheng Yang

AI总结:

本文针对由有限状态随机过程决定的未知离散加性信道,提出确定性和随机化两种噪声猜测通用译码策略,证明其具有与最优最大似然译码相同的随机编码误差指数,并给出复杂度上界,数值实验表明其性能优于基于训练的方法。

摘要:

我们研究由有限状态(单射)随机过程决定的未知离散加性信道上的通用译码。为了追求低复杂度译码器,我们研究了噪声猜测译码器的变体,这些变体在实际信道规律未知时使用噪声序列概率的估计器。一个确定性版本以固定顺序产生噪声序列,而一个新的随机化版本则随机抽取噪声序列,直到找到一个序列,将其从接收序列中减去后能得到一个有效码字。我们证明这两种策略都是随机编码通用的(即具有与最优最大似然译码相同的随机编码误差指数),并推导出它们复杂度的上界。加性马尔可夫信道中的数值例子说明了所提方法的性能,表明它们始终优于更常见的基于训练的策略。

英文摘要:

We study universal decoding over unknown discrete additive channels determined by a finite-state (unifilar) random process. Aiming at low-complexity decoders, we study variants of noise-guessing decoders that use estimators for the probability of a noise sequence when the actual channel law is unknown. A deterministic version produces noise sequences in a fixed order, and a new randomised version draws them at random, until finding a sequence that, subtracted from the received sequence, results in a valid codeword. We show that both strategies are random-coding universal (i.e. have the same random-coding error exponent as the optimal maximum likelihood decoding), and derive upper bounds for their complexity. Numerical examples in additive Markov channels illustrate the proposed methods' performance, showing that they consistently outperform a more usual training-based strategy.

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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