基于M-QAM和UEP的无线可伸缩视频联合优化传输  

Joint optimized transmission based on M-QAM and UEP for wireless scalable video

作　　者：汪志兵[1] 郑华[1] 崔慧娟[1] 唐昆[1] 

机构地区：[1]清华大学电子工程系微波与数字通信技术国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2007年第4期564-567,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(60272020)

摘　　要：可伸缩视频编码可以根据信道波动的情况传输部分码流获取较低的视频质量以适应无线信道的波动。在满足信道传输速率的约束条件下，给出了率失真意义下联合优化多进制正交调幅子信道分配、可伸缩视频编码的传输层数以及各层的信道编码保护级别的视频传输算法。实验结果表明，在加性高斯自噪声信道下，与等重保护且不考虑多进制正交调幅子信道差异的机制相比，该传输方案能够取得平均1．5～2dB的解码增益，显著提高了可伸缩视频码流无线传输的鲁棒性。Scalable video coding has the ability to transmit partial bit streams which can be used to reconstruct lower quality video according to the channel status to adapt to channel quality fluctuations. A rate-distortion optimized wireless video streaming algorithm was developed which considers the allocation of multiple quadrature amplitude modulation （M-QAM） sub-channels, the number of scalable video layers, and the channel coding protection priorities for various layers. Comparisons with the equal error protection （EEP） without consideration of prioritized sub-channels show that the algorithm provides 1.5 - 2 dB gain with robust video streaming over wireless channels.

关 键 词：可伸缩视频编码 非等重错误保护 多进制正交调幅 码率兼容删除卷积码 

分 类 号：TN919.85[电子电信—通信与信息系统]