科研之友
微信
新浪微博
Facebook
分享链接
摘要
To effectively deliver mobile video streaming in heterogeneous wireless networks, we propose a novel Dynamic Rate Assignment based Joint Source Channel Coding (DRA-JSCC) scheme. The existing JSCC schemes generally consider the communication network between end devices as a single transport link. Challenges arise in the context of multiple available links because involving an unreliable wireless network in the transmission will only degrade the video quality. The proposed DRA-JSCC addresses the challenging problem with following steps: (1) FEC redundancy estimation under the loss requirement;(2) source rate adaption within the delay constraint, and (3) dynamic rate assignment for minimizing the end-to-end video distortion. We analytically formulate the JSCC for optimizing video quality over multiple wireless channels and provide comprehensive analysis for the channel distortion. The performance of DRA-JSCC is evaluated through emulations in Exata. Experimental results show that DRA-JSCC outperforms the competing models in terms of video PSNR (Peak Signal-to-Noise Ratio) and end-to-end delay.
- 出版日期2015-2-1
- 单位北京大学; 网络与交换技术国家重点实验室
