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arXiv 2103.11904cs.ITmath.IT
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二进制删除信道的新容量上界

New Capacity Upper Bounds For Binary Deletion Channel

School of EECS, Oregon State University(俄勒冈州立大学电气与计算机工程学院)

Hassan Tavakoli

AI总结:

研究二进制删除信道容量上界,通过计算辅助信道容量及逼近互信息得出两个闭式上界,采用一阶马尔可夫过程,从第一原理验证优化,还将第二个上界与其他上界比较。

摘要:

本文研究了具有删除功能的二进制信道。我们推导了二进制删除信道(BDC)容量的两个闭式上界。第一个上界是通过计算辅助信道(两位固定长度输入BDC,即FI-BDC)的容量,并证明该辅助容量是BDC容量的上界得到的。第二个上界是通过直接逼近发送和接收比特之间的互信息,得到一个由一阶马尔可夫相关参数γ参数化的闭式表达式。两个上界都对信道输入采用一阶马尔可夫过程。我们从第一原理验证了定理1的优化,直接从两位辅助信道的转移矩阵而非仅从互信息表达式进行验证:潜在目标是严格凹的,有唯一的内部最大化器,所得闭式上界被确认为正确的。在图4中,将第二个提出的上界与Fertonani-Duman和Dalai上界进行了比较。

英文摘要:

This paper considers a binary channel with deletions. We derive two closed-form upper bounds on the capacity of the binary deletion channel (BDC). The first bound is obtained by computing the capacity of an auxiliary channel, the two-bit Fixed-length-Input BDC (FI-BDC), and showing that this auxiliary capacity upper-bounds the capacity of the BDC. The second bound is obtained by approximating the mutual information between sent and received bits directly, yielding a closed-form expression parameterized by a first-order Markov correlation parameter $γ$. Both bounds use a first-order Markov process for the channel input. We verify Theorem~1's optimization from first principles, directly from the two-bit auxiliary channel's transition matrix rather than from the mutual-information expression alone: the underlying objective is strictly concave with a unique interior maximizer, and the resulting closed-form bound is confirmed correct. The second proposed upper bound is evaluated against the Fertonani--Duman and Dalai bounds in Fig.~4.

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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