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首页> 外文期刊>IEEE Transactions on Circuits and Systems for Video Technology >Low-delay and error-robust wireless video transmission for video communications
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Low-delay and error-robust wireless video transmission for video communications

机译：用于视频通信的低延迟和稳健的无线视频传输

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摘要

Video communications over wireless networks often suffer from various errors. A novel video transmission architecture is proposed to meet the low-delay and error-robust requirement of wireless video communications. This architecture uses forward error correction coding and automatic repeat request (ARQ) protocol to provide efficient bandwidth access from wireless link. In order to reduce ARQ delay, a video proxy server is implemented at the base station. This video proxy not only reduces the ARQ response time, but also provides error-tracking functionality. The complexity of this video proxy server is analyzed. Experiment shows that about 8.9% of the total macroblocks need to be transcoded under a random-error condition of 10/sup -3/ error probability. Because H.263 is the most popular video coding standard for video communication, we use it as an experiment platform. A data-partition scheme is also used to enhance error-resilience performance. This architecture is also suitable for various motion-compensation-based standards like H.261, H.263 series, MPEG-1, MPEG-2, MPEG-4, and H.264. For "Foreman" sequence under a random-error condition of 10/sup -3/ error probability, luminance peak signal-to-noise ratio decreases only 0.35 dB, on average.
机译：无线网络上的视频通信经常遭受各种错误。提出了一种新颖的视频传输架构，以满足无线视频通信的低延迟和鲁棒性要求。该体系结构使用前向纠错编码和自动重复请求（ARQ）协议来提供来自无线链路的有效带宽访问。为了减少ARQ延迟，在基站上实现了视频代理服务器。该视频代理不仅减少了ARQ响应时间，而且还提供了错误跟踪功能。分析了此视频代理服务器的复杂性。实验表明，在10 / sup -3 /错误概率的随机错误条件下，需要转换全部宏块的8.9％。由于H.263是用于视频通信的最流行的视频编码标准，因此我们将其用作实验平台。数据分区方案还用于增强错误恢复性能。该体系结构还适用于各种基于运动补偿的标准，例如H.261，H.263系列，MPEG-1，MPEG-2，MPEG-4和H.264。对于在10 / sup -3 /误差概率的随机误差条件下的“工头”序列，亮度峰值信噪比平均仅降低0.35 dB。

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