无线视频的一种码率控制方法  

Rate control scheme for wireless video transmission

作　　者：陈云鹏[1] 张培仁[1] 高修峰[1] 

机构地区：[1]中国科学技术大学自动化系嵌入式系统与控制网络实验室,安徽合肥230027

出　　处：《通信学报》2006年第3期94-98,共5页Journal on Communications

摘　　要：无线信道的高误码率对视频图像质量有很大的影响,前向纠错(FEC)和自动重发请求(ARQ)对于降低无线信道的误码率,提高图像质量有很好的效果。通过对FEC和ARQ方法的有效性分析,在TMN8的基础上提出一种简单的混合FEC/ARQ自适应模式选择码率控制方法。该方法首先预测报文丢失数量和纠错报文传输时延,从而选择合适的纠错编码模式,并为纠错编码分配比特数。实验结果表明该方法有效降低无线信道下报文丢失率,显著提高了图像质量。When video stream transmitted on wireless channel, packet loss greatly degraded the picture quality. Forward error correction （FEC） and automatic repeat request （ARQ） methods showed good performance in resisting channel disturbance and improving picture quality. By analyzing the effectiveness, a formula was given to select appropriate method between FEC and ARQ according to channel status. Then an adaptive hybrid FEC/ARQ rate control scheme was pro- posed. The new scheme can select appropriate error resilience mode and allocate sufficient bits for channel coding by predicting channel status and estimating channel delay. Experiments show this scheme highly improves video quality.

关 键 词：视频传输 无线信道 码率控制 混合FEC/ARQ 

分 类 号：TN919.81[电子电信—通信与信息系统]