跨层反馈在无线视频自适应编码中的应用
摘 要
为提高压缩后视频在无线信道中的容错能力,结合当前无线通信系统中广泛使用的自适应调制编码(AMC)技术和自动重传请求(ARQ)技术,提出一种新的基于跨层反馈的自适应编码方案。利用该设计方案,应用层可以利用底层的反馈信息感知到当前的信道变化并调整相应的码控策略来提高视频传输的鲁棒性。实验结果表明,与没有利用跨层反馈的其他方法相比,本文编码策略能提供更好的视频传输质量。
关键词
Cross-layer feedback based adaptive coding for wireless video transmission
Wang Yaozhong1, Zheng Shibao1,2, Zhang Chongyang1,2, Liu Bo1,2(1.Institute of Image Communication and Network Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2.Shanghai Key Labs of Digital Media Processing and Communication, Shanghai Jiao Tong University, Shanghai 200240, China) Abstract
One cross-layer feedback based on video coding scheme is proposed in this paper, which applies both adaptive modulation coding (AMC)and automatic repeat request (ARQ)techniques to provide an adaptive wireless video coding solution. Within this method, timely channel-aware can be obtained by the feedback information from the PHY layer, and then the video encoder at application (APP)layer can take accurate rate control to adapt the channel’s bandwidth varying. Experimental results showed that, compared to the existed scheme without feedback and channel-aware, the proposed method can get a significant improvement in Peak Signal-to-Noise Ratio (PSNR)for wireless video transmission.
Keywords
wireless video transmission adaptive coding cross-layer feedback adaptive modulation coding (AMC) automatic repeat request (ARQ)
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