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.
出处
《通信学报》
EI
CSCD
北大核心
2006年第3期94-98,共5页
Journal on Communications
