While there has always been a tremendous demand for streaming video over
Wireless networks, the nature of the application still presents some challenging
issues. These applications that transmit coded video sequence data over best-effort
networks like the Internet, the application must cope with the changing network
behaviour; especially, the source encoder rate should be controlled based on
feedback from a channel estimator that explores the network intermittently. The
arrival of powerful video compression techniques such as H.264, which advance in
networking and telecommunications, opened up a whole new frontier for multimedia
communications. The aim of this research is to transmit the H.264 coded video
frames in the wireless network with maximum reliability and in a very efficient
manner. When the H.264 encoded video sequences are to be transmitted through
wireless network, it faces major difficulties in reaching the destination. The
characteristics of H.264 video coded sequences are studied fully and their capability
of transmitting in wireless networks are examined and a new approach called
Optimal Packet Fragmentation (OPF) is framed and the H.264 coded sequences are
tested in the wireless simulated environment. This research has three major studies
involved in it. First part of the research has the study about Long Range Dependence
(LRD) and the ways by which the self-similarity can be estimated. For estimating the
LRD a few studies are carried out and Wavelet-based estimator is selected for the
research because Wavelets incarcerate both time and frequency features in the data
and regularly provides a more affluent picture than the classical Fourier analysis.
The Wavelet used to estimate the self-similarity by using the variable called Hurst
Parameter. Hurst Parameter tells the researcher about how a data can behave inside the transmitted network. This Hurst Parameter should be calculated for a more
reliable transmission in the wireless network. The second part of the research deals
with MPEG-4 and H.264 encoder. The study is carried out to prove which encoder is
superior to the other. We need to know which encoder can provide excellent Quality
of Service (QoS) and reliability. This study proves with the help of Hurst parameter
that H.264 is superior to MPEG-4. The third part of the study is the vital part in this
research; it deals with the H.264 video coded frames that are segmented into optimal
packet size in the MAC Layer for an efficient and more reliable transfer in the
wireless network. Finally the H.264 encoded video frames incorporated with the
Optimal Packet Fragmentation are tested in the NS-2 wireless simulated network.
The research proves the superiority of H.264 video encoder and OPF¿s master class.
| Identifer | oai:union.ndltd.org:BRADFORD/oai:bradscholars.brad.ac.uk:10454/5729 |
| Date | January 2012 |
| Creators | Jayaseelan, John |
| Contributors | Jiang, Jianmin, Min, Geyong |
| Publisher | University of Bradford, Department of Electronic Imaging and Media Communications |
| Source Sets | Bradford Scholars |
| Language | English |
| Detected Language | English |
| Type | Thesis, doctoral, PhD |
| Rights | <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by-nc-nd/3.0/88x31.png" /></a><br />The University of Bradford theses are licenced under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/">Creative Commons Licence</a>. |
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