OFDM系统中视频传输的调度算法研究  

Research of Scheduling for Video Communication in OFDM Systems

作　　者：李蕾[1] 宋建新[1] 

机构地区：[1]南京邮电大学图像处理与图像通信实验室,江苏南京210003

出　　处：《电视技术》2012年第5期53-56,共4页Video Engineering

摘　　要：针对OFDM系统,提出了一种基于视频内容的跨层调度方案。该方案采用了基于生存期的包排序策略,根据视频包的生存期大小进行排序,保证视频包能在生存期内发送到接收端,减少丢包数目。同时,采用跨层设计的思想,综合考虑了信道状况和视频包特性,如视频包生存期、重要性、解码器采用的错误掩藏方法,提出改进的比例公平调度算法,不仅有效地利用了多用户分集来进一步提高数据吞吐量,也充分考虑了视频的重要性和时延约束。实验结果表明,采用内容感知的跨层调度算法,解码端的视频质量得到有效提高,从而可以提高主观感知质量。A content-aware cross-layer scheduling scheme for video communication in OFDM systems is presented. This proposed scheme makes use of a packet prioritization strategy that orders video packets based on their deadline. Therefore, packets with large deadline are transmitted first to reduce the number of lossed packets due to expiration of deadline. Meanwhile, the proposed scheme is based on the thought of cross-layer optimization, which takes into account of channel conditions and video packet characteristics, such as the deadline, importance of packet, and error-concealment methods employed at the decoder. The proposed modified proportional fair scheduling algorithm does not only make use of multi-user diversity to improve the data through- put, but also make use of the content and delay characteristics. Simulation results show that the proposed content-aware cross-layer scheduling algorithm can improve the video quality at the decoder, thus improve subjective perceptual quality.

关 键 词：OFDM系统 跨层调度 比例公平 视频内容 H.264 

分 类 号：TN919.85[电子电信—通信与信息系统]