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arXiv 2509.08079cs.ITmath.IT
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线性可靠性信道

The Linear Reliability Channel

Alexander Mariona, Ken R. Duffy, Muriel Médard

AI总结:

本文提出线性可靠性信道(LRC),在噪声方差高时近似一般离散调制连续噪声信道,利用其组合性质分析ML解码错误指数,并评估软判决优势,为软判决码构造提供新视角。

摘要:

我们引入并分析了一种离散软判决信道,称为线性可靠性信道(LRC),其中软信息是接收符号可靠性的秩排序。我们证明,当噪声方差较高时,LRC是对一般离散调制、连续噪声信道类别的适当近似。LRC的核心特征在于其组合性质,使得能够对信道及其相应的硬判决和软判决最大似然(ML)解码器进行广泛的数学分析。特别是,我们在使用随机码进行硬判决和软判决解码时,为LRC中的ML解码建立了显式的错误指数。该分析能够直接、定量地评估软判决解码的相对优势。LRC的离散几何与以汉明重量为特征的BSC不同,为软判决环境下的码构造提供了新的视角。

英文摘要:

We introduce and analyze a discrete soft-decision channel called the linear reliability channel (LRC) in which the soft information is the rank ordering of the received symbol reliabilities. We prove that the LRC is an appropriate approximation to a general class of discrete modulation, continuous noise channels when the noise variance is high. The central feature of the LRC is that its combinatorial nature allows for an extensive mathematical analysis of the channel and its corresponding hard- and soft-decision maximum likelihood (ML) decoders. In particular, we establish explicit error exponents for ML decoding in the LRC when using random codes under both hard- and soft-decision decoding. This analysis allows for a direct, quantitative evaluation of the relative advantage of soft-decision decoding. The discrete geometry of the LRC is distinct from that of the BSC, which is characterized by the Hamming weight, offering a new perspective on code construction for soft-decision settings.

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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