视频通信中的应用层前向纠错技术

Application layer forward error correction technology in video communication

为了在信道带宽受限的情况下保证视频效果,提出一种适用于无线网络中视频广播通信的应用层前向纠错方案,该方案根据不同的视频符号对接收端重建视频质量的贡献为其分配不同的优先级,充分利用了视频数据的不等重要性的特点.在系统信道带宽有限的情况下,综合考虑了不同终端的信道状况,通过牺牲少部分低丢包率终端的视频质量为代价,获得了小区内所有用户总体接收视频质量显著提高.仿真实验结果表明:与等差错保护方案和扩展窗不等差错保护方案相比,本文提出方案的用户平均接收视频质量高2~5 d B.

In order to ensure the quality of video effect under the condition of limited channel bandwidth, an application layer forward error correction scheme for video broadcast in wireless networks is proposed. The proposed scheme assigns each video packet a different priority according to their contribution to the reconstructed video quality,makes full utilization of this characteristic. The scheme takes all the terminals into consideration and aims at improving the overall received video quality by sacrificing the quality of terminals with low packet loss probability.Simulation results showed that the proposed scheme can achieve 2-5 dB average PSNR enhancement compared with the EEP and EW schemes.