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arXiv 1901.06975cs.ITmath.IT
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线性分组码在擦除信道上的差错指数的一个下界

A Lower Bound on the Error Exponent of Linear Block Codes over the Erasure Channel

Enrico Paolini, Gianluigi Liva

摘要:

给出了线性分组码在擦除信道下的最大似然(ML)译码误差指数的一个下界。在擦除概率的系综特定区间上,当系综权重谱形状函数随着分数码字权重趋于零而趋于负值时,下限变为正。因此,对于这些集合,我们可以降低逐块ML解码阈值。给出了两个例子,即线性随机奇偶校验码和固定速率Raptor码与线性随机预编码器。虽然对于前者,完整的解析解是可能的,但对于后者,我们可以通过简单地求解2x 2非线性方程组来降低擦除信道上的ML解码阈值。

英文摘要:

A lower bound on the maximum likelihood (ML) decoding error exponent of linear block code ensembles, on the erasure channel, is developed. The lower bound turns to be positive, over an ensemble specific interval of erasure probabilities, when the ensemble weight spectral shape function tends to a negative value as the fractional codeword weight tends to zero. For these ensembles we can therefore lower bound the block-wise ML decoding threshold. Two examples are presented, namely, linear random parity-check codes and fixed-rate Raptor codes with linear random precoders. While for the former a full analytical solution is possible, for the latter we can lower bound the ML decoding threshold on the erasure channel by simply solving a 2 x 2 system of nonlinear equations.

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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