无线Ad hoc网络上的自适应多描述编码

Adaptive multiple description coding over wireless Ad hoc networks

为了在带宽较小、拓扑实时变化、易受外界影响的无线Ad hoc网络中实行视频的可靠通信,提出了一种自适应多相变换多描述编码策略。通过不同的相位点来产生多种描述,利用OLSR路由协议中的Hop和ETX来动态改变各描述的量化步长,以适应实时变化的Ad hoc网络。仿真实验证明,与传统的单描述编码(如H.264/AVC)相比,自适应多相变换多描述编码在提高信噪比、降低丢包率和平均失真方面比传统方式均有明显改善。仿真实验证明了所提出方案传输视频是优越的、可行的。

In wireless Ad hoc networks with low bandwidth, variable topology and susceptible to environment, in order to realize reliable communication, this paper proposed an adaptive multi-phase transform multiple description coding strategy. Created the different descriptions by different phases, and adopted their quantification step adaptively for variable Ad hoc network based on Hop and ETX from OLSR. The simulation results show that adaptive multi-phase transform multiple description coding is much better than the traditional single-description coding （ such as H. 264/AVC） in improving PSNR, reducing average distortion and dropping rate. Experiments prove that transmission video with proposed method is superior and feasible.