实时视频传输的帧级别前向纠错信道编码  

Frame-level forward error correction channel coding for real-time video transmission

作　　者：柳粟杰 杨秀芝[1] 陈平平[1] 王琳[2] LIU Sujie;YANG Xiuzhi;CHEN Pingping;WANG Lin(College of Physics and Information Engineering,Fuzhou University,Fuzhou 350108,China;School of Informatics,Xiamen University,Xiamen 361005,China)

机构地区：[1]福州大学物理与信息工程学院,福建福州350108 [2]厦门大学信息学院,福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2020年第6期964-971,共8页Journal of Xiamen University：Natural Science

基　　金：国家自然科学基金(61871132);福建省自然科学基金(2019J01223)。

摘　　要：针对5G通信中低时延、高可靠传输需求,在视频编码传输系统中,给定传输带宽的条件下,提出了视频帧级别的应用层前向纠错(FEC)信道编码的优化方案.联合考虑视频有损压缩失真和信道丢包,选取量化参数(QP)和视频帧FEC码率,优化压缩和FEC编码的冗余分配,改进视频重构效果.又因视频重构图像组(GOP)中,帧内编码(I帧)和靠近它的帧间编码(P帧)具有相似的重要性,所以在给定QP后进一步提出帧级别的动态FEC方案,动态分配I帧和P帧的冗余.随机丢包的仿真传输系统结果表明:1)QP分别为25,30和40时,视频重构在QP为30时效果最好;2)当QP为30,丢包率(PLR)为5%时,相比于传统FEC方案,帧间动态FEC方案可有效提高视频峰值信噪比(PSNR);3)在实际高清需求中通过端到端传输的5G远程驾驶,表明所提出的动态FEC方案可保证路况视频的实时传输.In this paper,aiming at requirements of low-latency and high-reliability transmission in 5G communications,we propose an optimized scheme of forward error correction(FEC)channel coding at video frame-level in the video coding transmission system under the given transmission bandwidth:We jointly consider the lossy compression distortion and channel packet loss of video,quantization parameter(QP)and FEC rate of video frame are selected to optimize compression and redundancy allocation of FEC coding,and improve the video reconstruction effect.Due to group of pictures(GOP)in video reconstruction,intra-frame coding(I-frame)and inter-frame coding(P-frame)near it have similar importance.Therefore,when QP is given,a frame-level dynamic FEC scheme is further proposed to dynamically allocate redundancy of the I-frame and P-frame.Results of the simulation transmission system with random packet loss show that:1)When QP are 25,30 and 40 respectively,the video reconstruction exerts the best effect when QP is 30;2)When QP is 30 and packet loss rate(PLR)is 5%,the dynamic FEC scheme can effectively improve the video peak signal to noise ratio(PSNR)compared with the traditional FEC scheme;3)In actual high-definition demand-end-to-end transmission of 5G remote driving,the dynamic FEC scheme proposed in this paper guarantees real-time transmission of road conditions video.

关 键 词：视频传输 5G通信 帧级别信道编码 前向纠错 

分 类 号：TN919.3+3[电子电信—通信与信息系统]