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Second-Order Asymptotics for Communication Under Strong Asynchronism

机译:强异步下的通信二阶渐近性

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The capacity under strong asynchronism was recently shown to be essentially unaffected by the imposed decoding delay-the elapsed time between when information is available at the transmitter and when it is decoded-and the output sampling rate. This paper shows that, in contrast with capacity, the second-order term in the maximum rate expansion is sensitive to both parameters. When the receiver must locate the sent codeword exactly and therefore achieve minimum delay equal to the blocklength n, the second-order term in the maximum rate expansion is of order Theta (1/rho) for any sampling rate rho = O(1/root n) (and rho = omega(1) for otherwise reliable communication is impossible). Instead, if rho = omega (1/root n), then the second-order term is the same as under full sampling and is given by a standard Theta (root n) term. However, if the delay constraint is only slightly relaxed to n(1+o(1)), then the above order transition (for rho = O(1/root n) and rho = (1/root n)) vanishes and the second-order term remains the same as under full sampling for any rho = omega(1).
机译:最近显示出强异步下的容量基本上不受所施加的解码延迟,即在发射机处可获得信息和对其进行解码之间所经过的时间以及输出采样率的影响。本文表明,与容量相比,最大速率扩展中的二阶项对这两个参数都敏感。当接收机必须精确定位发送的码字并因此获得等于块长n的最小延迟时,对于任何采样率rho = O(1 / root),最大速率扩展中的二阶项的Theta(1 / rho)阶数n)(并且rho = omega(1 / n),否则无法进行可靠的通信)。相反,如果rho = omega(1 / root n),则二阶项与完全采样下的项相同,并由标准Theta(root n)项给出。但是,如果延迟约束仅稍微放松到n(1 + o(1)),则上述阶跃转移(对于rho = O(1 / root n)和rho =(1 / root n))消失,并且对于任何rho = omega(1 / n),二阶项均与完全采样下的项相同。

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