基于HMM的视频自适应信道选择传输  

Adaptive Channel Allocation of Scalable Video Coding Based on HMM

作　　者：房林堂[1] 张晓林[1] 陈雷[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100191

出　　处：《电视技术》2009年第S2期156-159,共4页Video Engineering

基　　金：航空基础科学基金(04F51073)

摘　　要：提出了一种基于隐马氏模型(HMM)的可伸缩性视频编码的自适应传输方案。该方案中,使用了多输入多输出(MIMO)系统的多信道质量排序,作为信道状态信息(CSI)反馈到发送端。根据该信息,发送端实时进行不同信道的分配,从而保证可伸缩性视频编码中的基本层数据被分配在当前最佳质量的信道上传输。在获取这样的CSI方法上,通过HMM建模,利用接收端的费诺译码复杂度作为观察变量,更为精确地获取多个信道的质量排序。当信道质量都变差时,采用不等保护(UEP)对基本层进行重点保护。仿真结果表明该方案有效地提高了视频的恢复质量。In this paper,an adaptive channel allocation of scalable video coding on Mutiple Input Multiple Output(MIMO) channel is described,which uses the decoding information(Fano decoding complexity) to evaluate the channel states based on Hidden Markov Model(HMM).With such Channel Status Information(CSI),the base-layer sub-stream is allocated by transmitters of scalable video coding to the better channel to achieve the better quality of the reconstructed video.The Unequal Error Protection(UEP) is also employed by redundant channel coding to protect the base-layer sub-stream as the more important information,against channel errors.Simulation results obtained using the proposed adaptive scheme show a significantly improved visual performance for the reconstructed video over a variety of channel conditions.

关 键 词：自适应传输 不等保护 多输入多输出 可伸缩性视频编码 费诺序列译码 隐马尔科夫模型 

分 类 号：TN919.8[电子电信—通信与信息系统]