一种信道自适应的无线视频流差错控制机制  

Channel adaptive error control mechanism for wireless video streaming

作　　者：修晓宇[1] 卓力[1] 沈兰荪[1] 

机构地区：[1]北京工业大学信号与信息处理研究室,北京100022

出　　处：《通信学报》2005年第7期89-95,共7页Journal on Communications

基　　金：国家自然科学基金资助项目(90304001;60472036);北京市自然科学基金资助项目(4052007;4032008);北京市教委基金资助项目(KM200410005022;KZ200310005004)

摘　　要：提出了一种自适应的无线视频流差错保护方法。该方法充分考虑MPEG-4FGS码流细粒度可扩展的特性,根据码流的重要性程度采用不等的保护措施,同时能够自适应地根据无线信道的具体状况,将信道带宽在MPEG-4FGS信源编码速率和信道编码速率之间进行最优化分配,使得接收端能获得最佳的重建视频质量。实验结果表明,在各种不同信道状况下,与均等错误保护和固定的不等错误保护方法相比,该方法均可获得更好的性能。An adaptive error protecting method for wireless video streaming was proposed. In this method, the fine-grained scalable character of MPEG-4 FGS was considered adequately, the unequal error protection scheme was adopted for different parts of encoded bit-stream according to their importance degree. Meanwhile, the method can optimally allocate channel bandwidth between the source and the channel coders to yield best video reconstruction quality Experimental results show that, under various network conditions, compared with equal error protection and fixed unequal protection methods, the proposed scheme can always achieve better performance.

关 键 词：视频流 码率分配 MPEG-4 FGS 不等错误保护 RCPC码 

分 类 号：TP918[自动化与计算机技术]