基于修正时间间隔比的实时视频传输方法  

Modified Time-interval Ratio for Real-time Video Transmission

作　　者：姜青竹 田畅[2] 吴泽民[2] 付毅[3] 

机构地区：[1]解放军理工大学通信工程学院研究生3队 [2]解放军理工大学通信工程学院 [3]中国人民解放军73667部队

出　　处：《军事通信技术》2015年第2期7-12,共6页Journal of Military Communications Technology

摘　　要：码率自适应是无线视频传输的重要问题之一,而如何准确预测并反馈网络状况是其关键。文章针对传统的基于丢包率反馈的加性增乘性减(AIMD)算法码率波动大和丢包率高的问题,引入时间间隔比作为网络状况反馈参数,提出基于丢包率和时间间隔比的自适应系数AIMD算法,将丢包率转化为时间间隔参数来修正间隔比控制量。仿真实验表明,和传统的AIMD算法相比,该算法码率波动和丢包率都大大减小,视频质量得到显著提升。Bitrate adaption is one of the most essential issues for wireless video transmission, and how to predict and feedback the current channel condition exactly is a great challenge. To ad- dress rate fluctuation and high packet loss from the conventional Additive Increase and Multiplic- ative Decrease（AIMD） mechanism based on packet loss rate feedback, this paper took receive- send interval ratio as feedback parameter, and proposed a novel adaptive varying-coefficient AIMD algorithm based on Interval Ratio（AIMD-IR） where the packet loss was considered and transformed into an equivalent time interval. Simulation results show that the proposed algo- rithm significantly reduce rate fluctuation and packet loss, and achieves better video quality, compared with the conventional AIMD based on packet loss.

关 键 词：视频传输 码率自适应 加性增乘性减 时间间隔比 

分 类 号：TN919.85[电子电信—通信与信息系统]