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首页> 外文期刊>Journal of visual communication & image representation >Robust video streaming over wireless LANs using multiple description transcoding and prioritized retransmission
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Robust video streaming over wireless LANs using multiple description transcoding and prioritized retransmission

机译：通过使用多个描述转码和优先级重传的无线LAN进行强大的视频流传输

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摘要

Video transport over wireless Local Area Networks (LANs) usually suffers from signal fading, noise interference, and network congestion, leading to time-varying packet loss rate and fluctuating effective bandwidth. We propose in this paper an adaptive error control scheme to adaptively insert error-resilience features into a compressed video in the media gateway which serves roaming clients. Our scheme divides the error control operation into the single description (SD) and multiple-description (MD) modes according to channel condition estimation. In the SD mode, a content-based prioritized retransmission method is proposed to mitigate the error propagation due to packet loss in video transport over wireless LANs. The proposed prioritized retransmission scheme determines the retransmission schedule of a lost packet according to the packet's loss impact that is obtained in a front-end encoding process. In the MD mode, we propose a channel-aware MD transcoding method to take advantage of MD coding and path diversity so as to further mitigate the error propagation due to packet loss caused by transient channel switching while roaming in wireless LANs. Experimental results show that the proposed scheme effectively mitigates the error propagation due to packet loss, while maintaining low extra computational complexity and low overhead cost. The proposed method is suitable for realtime streaming of prestored videos.
机译：无线局域网（LAN）上的视频传输通常会遭受信号衰落，噪声干扰和网络拥塞的困扰，从而导致时变数据包丢失率和有效带宽波动。我们在本文中提出了一种自适应错误控制方案，可将错误恢复特性自适应地插入到为漫游客户端提供服务的媒体网关中的压缩视频中。我们的方案根据信道条件估计将错误控制操作分为单描述（SD）模式和多描述（MD）模式。在SD模式下，提出了一种基于内容的优先级重传方法，以减轻由于无线LAN上的视频传输中的数据包丢失而导致的错误传播。所提出的优先级重传方案根据在前端编码过程中获得的分组的丢失影响来确定丢失的分组的重传时间表。在MD模式下，我们提出了一种信道感知的MD转码方法，以利用MD编码和路径分集的优势，从而进一步减轻由于在无线LAN中漫游时瞬态信道切换导致的数据包丢失而导致的错误传播。实验结果表明，该方案有效地减轻了由于丢包引起的错误传播，同时保持了较低的额外计算复杂度和较低的开销成本。所提出的方法适用于预存储视频的实时流。

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