| Author: | Tam, Shue-wing John |
| Title: | Video modeling on statistical multiplexer analysis |
| Degree: | M.Sc. |
| Year: | 1995 |
| Subject: | Asynchronous transfer mode Multiplexing Image transmission Hong Kong Polytechnic University -- Dissertations |
| Department: | Multi-disciplinary Studies |
| Pages: | xi, 87, xvii leaves : ill. ; 30 cm |
| Language: | English |
| Abstract: | An ATM based broadband integrated networks can offer an wide ranges of video services. It is an advantage of ATM network to multiplex statistically several independent video communication channels into a very high speed channel. Video signal, however is bursty in nature, that is very different from voice and data signal. In order to cope with the video signal in the ATM network, a appropriate modeling of video signal is essential. Modeling of video signal have been the focus of much research recently. Several mathematical models are developed to represent the coded output of video sources. Applications of these models will be laid in the network simulation, evaluation of video cell loss probabilities and queueing delay in the multiplexing node of the ATM network. The modeling activity has not yet faded away, as more findings in the coded video signal proves the currently used models not accurate as expected. Therefore, the effort of this project is dedicated to investigate a better, simple-to-use, video statistical model to approximate the coded output of video scene, and throughout using an appropriate model, to analyze the statistical multiplexer problem with simulation and an analytical approach. Throughout this dissertation, video compressions technique as well as the architechiture of ATM network are reviewed. Measure of video signal is also mentioned. A simulation method so called autoregressive model is discussed. Since new finding shows that the video signal when it is measured for long run, can be best described statistically by a gamma distribution, a modified first order gamma-process autoregressive model is thus proposed. The result is discussed and will be used for simulation of the multiplexer problem. The loss probabilities and queueing delay is major core of the multiplexer problem. Firstly, a culumulative probability density function is proposed to caculate frame loss probabilities. The result is compared with that with simulation. Secondly further simulation work is concentrated on the study of dependence of frame arrival instant between video sources on the loss probabilities and queueing delay. A frame interleave and cell interleave scheme is proposed to be used in the simulation. The results such as cell loss probabilities and queueing delay of video cell in the interleave buffer will be discussed. At last, a GI/D/I model is reviewed. Its example is worked out, and verified with the simulation. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b11957876.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 3.24 MB | Adobe PDF | View/Open |
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