On Streaming Codes With Unequal Error Protection
On Streaming Codes With Unequal Error Protection
复制标题
具有不平等错误保护的流码
DOI：
--
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
J. Apostolopoulos
中科院分区：
文献类型：
--
作者：
Mahdi Haghifam;M. Krishnan;A. Khisti;Xiaoqing Zhu;Wai;J. Apostolopoulos
用于实时交互应用（例如音频和视频流）的错误控制代码必须在严格的延迟约束下运行，并且能够适应突发丢失。以前的工作已经描述了最佳流编码，当突发丢失低于某个最大阈值时，可以保证所有源数据包的完美及时恢复。在这项工作中，我们将流代码的概念推广到不等错误保护（UEP）设置。为此，我们定义了流代码的两个自然概念；符号级UEP和数据包级UEP。在符号级UEP中，每个源数据包内的符号具有不同的可恢复性要求。在分组级UEP场景中，偶数时隙和奇数时隙的分组具有不同的恢复保证。我们讨论这两种设置的实际动机并开发编码方案。我们通过信息论逆界建立最优性或接近最优性保证。对 Gilbert 和 Fritchman 通道的仿真表明，我们的编码方案在各种通道参数上都优于基线方案。
Error control codes for real-time interactive applications such as audio and video streaming must operate under strict delay constraints and be resilient to burst losses. Previous works have characterized optimal streaming codes that guarantee perfect and timely recovery of all source packets when the burst loss is below a certain maximum threshold. In this work, we generalize the notion of streaming codes to the unequal error protection (UEP) setting. Toward this end, we define two natural notions of streaming codes; symbol-level UEP and packet-level UEP. In the symbol-level UEP, the symbols within each source packet have varying recoverability requirements. In the packet-level UEP scenario, packets at even time slots and odd time slots have different recovery guarantees. We discuss practical motivations for both settings and develop coding schemes. We establish optimality or near-optimality guarantees through information-theoretic converse bounds. Simulations over Gilbert and Fritchman channels show that our coding schemes outperform baseline schemes over a wide range of channel parameters.