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arXiv 2012.00077cs.ITmath.ITstat.AP
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准定长信道码的误差指数及其假设检验

On Error Exponents of Almost-Fixed-Length Channel Codes and Hypothesis Tests

Anusha Lalitha, Tara Javidi

摘要:

我们研究一类新的信道编码策略,并假设检验被称为几乎固定长度的策略,在固定长度的策略停止时间几乎没有灵活性。这些策略的停止时间被允许稍微大,只有在一组罕见的样本路径与指数小的概率。我们表明,几乎固定长度的信道编码策略可以实现Burnashev的最佳错误指数。类似地,几乎固定长度的假设检验被证明可以弥合具有固定样本大小的假设检验和序贯假设检验之间的差距,并改善I型和II型误差指数之间的权衡。

英文摘要:

We examine a new class of channel coding strategies, and hypothesis tests referred to as almost-fixed-length strategies that have little flexibility in the stopping time over fixed-length strategies. The stopping time of these strategies is allowed to be slightly large only on a rare set of sample paths with an exponentially small probability. We show that almost-fixed-length channel coding strategies can achieve Burnashev's optimal error exponent. Similarly, almost-fixed length hypothesis tests are shown to bridge the gap between hypothesis testing with fixed sample size and sequential hypothesis testing and improve the trade-off between type-I and type-II error exponents.

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