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arXiv 2102.07756cs.ITcs.NIeess.SPmath.IT
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使用优化的可变长度编码的及时传输

Timely Transmissions Using Optimized Variable Length Coding

Ahmed Arafa, Richard D. Wesel

摘要:

考虑了一种状态更新系统,其中使用变长码在有噪声的信道上向接收机发送消息。目标是优化码字长度,使得成功解码的消息及时。也就是说,使得接收器处的信息年龄(AoI)最小化。采用混合ARQ(HARQ)方案,其中可变长度增量冗余(IR)比特被添加到原始发送的码字,直到解码成功。每次解码尝试都会导致非零处理延迟。最佳的码字长度解析推导出利用顺序差分优化(SDO)的框架。该框架是通用的,因为它只需要作为码字长度的函数的正反馈(ACK)概率的解析表达式的知识。

英文摘要:

A status updating system is considered in which a variable length code is used to transmit messages to a receiver over a noisy channel. The goal is to optimize the codewords lengths such that successfully-decoded messages are timely. That is, such that the age-of-information (AoI) at the receiver is minimized. A hybrid ARQ (HARQ) scheme is employed, in which variable-length incremental redundancy (IR) bits are added to the originally-transmitted codeword until decoding is successful. With each decoding attempt, a non-zero processing delay is incurred. The optimal codewords lengths are analytically derived utilizing a sequential differential optimization (SDO) framework. The framework is general in that it only requires knowledge of an analytical expression of the positive feedback (ACK) probability as a function of the codeword length.

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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