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arXiv 1807.11289cs.ITmath.IT
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强噪声信道的最大信息布尔函数

On the Most Informative Boolean Functions of the Very Noisy Channel

Hengjie Yang, Richard D. Wesel

摘要:

令$X^n$是均匀分布的$n$维二进制向量,并且$Y^n$是使$X^n$通过具有交叉概率$α$的二进制对称信道(BSC)的结果.最近由Courtade和Kumar提出的一个猜想指出,对于任何布尔函数$f:\{0,1\}^n\to\{0,1\}$,$I(f(X^n);Y^n)\le 1-H(α)$。虽然该猜想已被证明是真实的无量纲高噪声制度的Samorodnitsky,在这里,我们提出了一个基于微积分的方法,通过检查在$α=1/2$的二阶导数的$H(α)-H(f(X^n)|Y^n)$显示的尺寸依赖的结果。一路上,我们表明,独裁者的功能是最翔实的功能,在高噪音制度。

英文摘要:

Let $X^n$ be a uniformly distributed $n$-dimensional binary vector, and $Y^n$ be the result of passing $X^n$ through a binary symmetric channel (BSC) with crossover probability $α$. A recent conjecture postulated by Courtade and Kumar states that for any Boolean function $f:\{0,1\}^n\to\{0,1\}$, $I(f(X^n);Y^n)\le 1-H(α)$. Although the conjecture has been proved to be true in the dimension-free high noise regime by Samorodnitsky, here we present a calculus-based approach to show a dimension-dependent result by examining the second derivative of $H(α)-H(f(X^n)|Y^n)$ at $α=1/2$. Along the way, we show that the dictator function is the most informative function in the high noise regime.

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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