无线网络中支持H.264的增强前向纠错算法

Enhanced forward error correction algorithm supporting H.264 video transmission in wireless networks

为了在无线网络中支持H.264视频业务传输,提出了一种增强的前向纠错算法(EFEC),并对EFEC的性能进行了分析。EFEC通过接收端发送的反馈信息决定是否采用EFEC传输数据,且不会因为反馈信息的丢失而停止数据传输;同时EFEC根据网络误比特率调整附加数据信息的长度。详细的仿真实验表明,EFEC能自动适应网络状态的变化,采取合适的编码强度与较小的冗余信息,显著地提高H.264视频业务的传输质量。

In order to support H. 264 video traffic transmission in wireless networks, an enhanced Forward Error Correction （FEC） algorithm called Enhanced Forward Error Correction （EFEC） was proposed, and the performance of EFEC was analyzed. EFEC will decide whether the forward error correction transmission should be used or not if the sender receives feedback information and the sender would not stop transferring data due to the loss of the feedback information. EFEC would adjust the additional length of data according to the BER of wireless networks. Detailed simulation results prove that according to network status EFEC can adaptively adjust coding strength and redundancy to improve video quality obviously.