无线局域网中用于无缝切换的交错FEC系统:实现经验与实验研究

Hang Liu, Mingquan Wu, Dekai Li, S. Mathur, K. Ramaswamy, Liqiao Han, D. Raychaudhuri
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引用次数: 10

摘要

本文报告了一种用于无线局域网视频组播的交错自适应前向纠错(FEC)系统的实现经验和实验评估。在系统中,由一个跨包的FEC码产生的奇偶校验包从原始视频包中延时传输,即在不同的组播组中错播视频流和FEC流。延迟提供了时间分集,提高了视频组播的鲁棒性,特别是使客户端能够使用FEC纠正突发丢包,实现无缝切换。无线客户端根据自己的信道条件和切换事件动态加入FEC多播组。我们实现了包括流媒体服务器和客户端代理在内的系统。设计了一种新颖的软件体系结构,可以在不改变现有视频播放器软件的情况下将FEC功能集成到客户端。我们进行了大量的实验来研究FEC开销以及视频流和FEC流之间的延迟在不同干扰水平和移动切换持续时间下对视频质量的影响。在实际系统实现中,证明了交错自适应FEC系统在提高视频组播质量方面的有效性。
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A Staggered FEC System for Seamless Handoff in Wireless LANs: Implementation Experience and Experimental Study
We report the implementation experience and experimental evaluation of a staggered adaptive forward error correction (FEC) system for video multicast over wireless LANs. In the system, the parity packets generated by a cross-packet FEC code are transmitted at a time delay from the original video packets, i.e. staggercasting video stream and FEC stream in different multicast groups. The delay provides temporal diversity to improve the robustness of video multicast, especially to enable the clients to correct burst packet loss using FEC and to achieve seamless handoff. A wireless client dynamically joins the FEC multicast groups based upon its channel conditions and handoff events. We have implemented the system including the streaming server and client proxy. A novel software architecture is designed to integrate the FEC functionality in the clients without requirement for changing the existing video player software. We conduct extensive experiments to investigate the impact of FEC overhead and the delay between the video stream and FEC stream to the video quality under different interference levels and mobile handoff durations. The efficacy of staggered adaptive FEC system on improving video multicast quality is demonstrated in real system implementation.
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