基于信道特性的混合数字模拟视频传输方案Hybrid Digital-analog Scheme for Video Transmission Based on Channel Characteristics
张帆,王安红
摘要(Abstract)：
无线视频组播在无线网络中的应用越来越多,如何使具有异构特性的视频组播用户得到与其信道条件相匹配的视频质量和实现视频质量的平滑降级,是无线视频组播面临的难题。提出了一种基于信道特性的混合数字模拟视频传输(Hybrid Digital-Analog video transmission,HDACast)方案。将数字编码和模拟编码的优势结合,利用子载波分配算法实现HDACast方案的传输,同时利用注水算法作为功率分配算法,从而实现了性能的进一步提升。与具有相同目标的视频软播(Soft Cast)和HDACast的仿真结果比较表明了该方案具有更高的单播效率和组播效率。
关键词(KeyWords)： 信道特性;子载波分配;功率分配
基金项目(Foundation): 国家自然基金(61272262);; 山西省回国留学人员科研资助项目(2014-056);; 教育部新世纪优秀人才项目(NCET-12-1037)
作者(Author): 张帆,王安红
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