一种无线视频传输的跨层自适应不平等保护方法
doi: 10.3724/SP.J.1146.2005.00642
An Unequal Protection Strategy for Adaptive Cross Layer Video Transmission over Wireless Channels
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摘要: 无线网络的异构性给多媒体业务带来了很大的挑战，跨层设计因此成为研究的热点。该文提出一种针对视频传输的跨层自适应保护方法，根据信道变化自适应选择应用层、链路层和物理层最优的编码和传输策略组合，对视频码流中具有不同重要性的数据进行不平等保护。仿真结果证明，该文提出的跨层保护方法能够在信道条件比较差的情况下提供更好的视频传输质量。Abstract: Robust multimedia transmission over heterogeneous wireless networks is challenging. A protocol architecture that considers cross layer interaction is required. In this paper, an adaptive cross layer unequal protection strategy is proposed for video transmission over wireless channels. This strategy performs joint optimization across application layer, link layer and physical layer to provide unequal protection ability for video bitstream with different priority. Experimental results show the extraordinary improvement in PSNR of the proposed adaptive cross layer strategy over a variety of channel conditions.
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