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arXiv 1205.4233cs.NIcs.ITmath.IT
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面向异构用户的三种无线编码广播方案

Three Schemes for Wireless Coded Broadcast to Heterogeneous Users

Yao Li, Emina Soljanin, Predrag Spasojevic

摘要:

我们研究和比较三种编码方案的单服务器无线广播的多描述编码的内容,异构用户。用户(汇聚节点)在不同的丢包率的链路上需要不同数量的描述。这三种编码方案分别基于LT码、增长码和随机组块码。该计划进行比较的基础上,所需的传输总数,以提供所有用户的需求,我们称之为服务器(源)的交付时间。我们设计的LT码的度分布,通过解决适当定义的线性优化问题,并数值表征不同的编码方案的可实现的交付时间。我们发现,包括一个系统的阶段(未编码的传输)是非常有益的低需求的情况下,编码是必要的,有效地提供高需求。不同的需求和出错率情况可能需要非常不同的编码方案。在异构通信场景中,增长码和分块码的性能不如优化的LT码。

英文摘要:

We study and compare three coded schemes for single-server wireless broadcast of multiple description coded content to heterogeneous users. The users (sink nodes) demand different number of descriptions over links with different packet loss rates. The three coded schemes are based on the LT codes, growth codes, and randomized chunked codes. The schemes are compared on the basis of the total number of transmissions required to deliver the demands of all users, which we refer to as the server (source) delivery time. We design the degree distributions of LT codes by solving suitably defined linear optimization problems, and numerically characterize the achievable delivery time for different coding schemes. We find that including a systematic phase (uncoded transmission) is significantly beneficial for scenarios with low demands, and that coding is necessary for efficiently delivering high demands. Different demand and error rate scenarios may require very different coding schemes. Growth codes and chunked codes do not perform as well as optimized LT codes in the heterogeneous communication scenario.

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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