Multimedia over wireless ip networks:distortion estimation and applications.
M. D'Orlando · OpenstarTs (Univeristy of Trieste https://www.units.it/) · 2008
This thesis deals with multimedia communication over unreliable and resource constrained IP-based packet-switched networks.The focus is on estimating, evaluating and enhancing the quality of streaming media services with particular regard to video services.The original contributions of this study involve mainly the development of three video distortion estimation techniques and the successive definition of some application scenarios used to demonstrate the benefits obtained applying such algorithms.The material presented in this dissertation is the result of the studies performed within the Telecommunication Group of the Department of Electronic Engineering at the University of Trieste during the course of Doctorate in Information Engineering.In recent years multimedia communication over wired and wireless packet based networks is exploding.Applications such as BitTorrent, music file sharing, multimedia podcasting are the main source of all traffic on the Internet.Internet radio for example is now evolving into peer to peer television such as CoolStreaming.Moreover, web sites such as YouTube have made publishing videos on demand available to anyone owning a home video camera.Another challenge in the multimedia evolution is inside the house where videos are distributed over local WiFi networks to many end devices around the house.More in general we are assisting an all media over IP revolution, with radio, television, telephony and stored media all being delivered over IP wired and wireless networks.All the presented applications require an extreme high bandwidth and often a low delay especially for interactive applications.Unfortunately the Internet and the wireless networks provide only limited support for multimedia applications.Variations in network conditions can have considerable consequences for real-time multimedia applications and can lead to unsatisfactory user experience.In fact, multimedia applications are usually delay sensitive, bandwidth intense and loss tolerant applications.In order to overcame this limitations, efficient adaptation mechanism must be derived to bridge the application requirements with the transport medium characteristics.Several approaches have been proposed for the robust transmission of multimedia packets; they range from source coding solutions to the addition of redundancy List of acronyms ADAAdvances Distortion Algorithm.