A Framework for Efficient Wireless Video Communication: Dynamic Source/Channel Adaptation and Distortion Evaluation

Pappas，Thrasyvoulos西北大学一直对支持无线网络上的视频通信很感兴趣。这不是一个简单的任务，由于严格的服务质量（QoS）要求的视频应用和无线信道的许多损害。视频的两个重要QoS特性是信号失真度和传输延迟。无线信道是有损耗的，具有时变响应，并且受到多用户干扰。此外，由于无线网络的用户是移动的，因此有效地利用可用的能量是一个关键的考虑因素。我们在跨层框架中联合考虑了这些方法的组合，具体地说，我们考虑了联合自适应信源编码参数，如量化步长和预测模式，以及沿着物理层资源，如传输速率和功率。我们的目标是提供可接受的QoS，同时考虑到系统的约束条件，如可用的能量。我们提出了一个总体框架，允许一些资源/distortionoptimal配方平衡的要求不同的应用程序。

ABSTRACT0311838Pappas, ThrasyvoulosNorthwestern UThere has been much interest in supporting video communication over wireless networks. This isnot a simple task due to the stringent Quality of Service (QoS) required by video applications andthe many impairments of wireless channels. Two important QoS characteristics for video are thedegree of signal distortion and the transmission delay. Wireless channels are lossy, have a timevaryingresponse, and are subject to multi-user interference. Furthermore, since users of a wirelessnetwork are mobile, e.ciently utilizing the available energy is a key consideration.The di.culties inherent in wireless video can be addressed at both the physical layer and thesource coding layer. We jointly consider a combination of these approaches in a cross-layer framework.Speci.cally, we consider jointly adapting source coding parameters, such as the quantizationstep-size and prediction mode, along with physical layer resources, such as the transmission rate andpower. Our goal is to provide acceptable QoS while taking into account system constraints such asthe available energy. We propose a general framework that allows a number of resource/distortionoptimal formulations for balancing the requirements of di.erent applications.