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Research On Interactive Video Transmission Strategy

Posted on:2006-02-09Degree:DoctorType:Dissertation
Country:ChinaCandidate:B LuoFull Text:PDF
GTID:1118360182969768Subject:Information and Communication Engineering
Abstract/Summary:PDF Full Text Request
In video service field, the development of digital video technology and communications technology brings people not only the improvement of video quality. The chief attraction is that people could process and get the information more expediently. People always want to get more colorful information service. Absolutely, video on demand is one of the most important technologies; and it has a wide application. Although, the network bandwidth is increased rapidly; the capacity of media server is improved continuously; and the performance of the user's terminal unit is enhanced. They can not keep up with the increase of the user's requirements in the video on demand service. How to provide an instant video service in large-scale VoD system; and how to provide a wireless VoD service are the challenges to us. In this thesis, we focus on two aspects of the VoD technology. One is the video stream-broadcasting scheme. The other one is the architecture of the new-style VoD system. We analyze the characteristic and flaw of the current technology firstly. And then we propose our new scheme and method. We use mathematics tools and computer simulation as our main instrument to analyze, evaluate and validate our research work. Firstly, we analyze the periodic broadcasting technology deeply. Based on it, we propose a modified fast broadcasting (MFB) scheme. Bescause of using extended broadcast channel and scheduling the video segments in channels artfully, the MFB scheme needs less buffer requirements and disk I/O requirements than the fast broadcasting (FB) scheme in the same service delay. And users can also share the VoD service in a short service delay even their terminal units without local storage. Video proxy server is one of the main technologies in large-scale stream media distributing system for shielding the transmission delay of multimedia over the Internet and lightening the context server load. We discuss the method of multimedia streams distribution based on proxy server. Proxy storage is divided into static and dynamic storage. Linear programming is used to initialize the static storage and special cache replacement arithmetic is used to manage the dynamic storage. The simulated results show that the method gets a high demand-success ratio, byte-hit ratio and a low video demand delay. In the last part of this thesis, we propose two VoD system models in the new application circumstance. We wed digital terrestrial television technique to 802.11g wireless local area networks technique; and propose a hybrid wireless VoD system model for the first time. The client access arithmetic and a client "density sensitivity"cache-selective scheme are discussed in our wireless VoD system. A peer-to-peer live video distributing model is proposed in the end. Because of using multiple description coding technology and ingenious transmission scheme, this live video distributing model make effective use of network bandwidth and has a good robustness to the network bandwidth changing, package losing and transmitting delay.
Keywords/Search Tags:VoD, Periodic Broadcasting, Proxy Cache, Mobile Networks, P2P, MDC
PDF Full Text Request
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