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arXiv 1006.0334cs.ITmath.IT
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离散信道的单次容量

One-Shot Capacity of Discrete Channels

Rui A. Costa, Michael Langberg, João Barros

摘要:

香农将信道容量定义为存在块长度为$n$的码序列的最高速率,使得当$n$变为无穷大时错误概率变为零。在该定义中,隐含的是,可以被视为可用信道使用的数量的块长度是无限的。当传输功率必须集中在单个传输上时,情况并非如此,特别是在具有敌对条件的军事场景或具有随机短暂遭遇的延迟容忍网络中。一个很自然的问题出现了:在一次信道使用中,我们可以传输多少信息?我们给出了一个精确的表征离散信道的单次容量,定义为在一个单一的使用一个信道的错误概率,不超过规定的值,可以传输的位数的最大值。这种能力的定义被证明是有用的,并显着不同的零错误的问题陈述。

英文摘要:

Shannon defined channel capacity as the highest rate at which there exists a sequence of codes of block length $n$ such that the error probability goes to zero as $n$ goes to infinity. In this definition, it is implicit that the block length, which can be viewed as the number of available channel uses, is unlimited. This is not the case when the transmission power must be concentrated on a single transmission, most notably in military scenarios with adversarial conditions or delay-tolerant networks with random short encounters. A natural question arises: how much information can we transmit in a single use of the channel? We give a precise characterization of the one-shot capacity of discrete channels, defined as the maximum number of bits that can be transmitted in a single use of a channel with an error probability that does not exceed a prescribed value. This capacity definition is shown to be useful and significantly different from the zero-error problem statement.

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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